105 files changed, 19988 insertions, 0 deletions
diff --git a/src/api/burn/CustomizedNativeRecommendedRules.ruleset b/src/api/burn/CustomizedNativeRecommendedRules.ruleset
new file mode 100644
index 00000000..142b141c
--- /dev/null
+++ b/src/api/burn/CustomizedNativeRecommendedRules.ruleset
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="utf-8"?>
+<RuleSet Name="Customized Microsoft Native Recommended Rules" Description="Microsoft Native Recommended Rules, -C26812" ToolsVersion="16.0">
+  <Include Path="nativerecommendedrules.ruleset" Action="Default" />
+  <Rules AnalyzerId="Microsoft.Analyzers.NativeCodeAnalysis" RuleNamespace="Microsoft.Rules.Native">
+    <!-- We need C style enums since we support BAs written in C -->
+    <Rule Id="C26812" Action="None" />
+  </Rules>
+</RuleSet>
+\ No newline at end of file
diff --git a/src/api/burn/Directory.Build.props b/src/api/burn/Directory.Build.props
new file mode 100644
index 00000000..fb34d54e
--- /dev/null
+++ b/src/api/burn/Directory.Build.props
@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<!--
+  Do NOT modify this file. Update the canonical version in Home\repo-template\src\Directory.Build.props
+  then update all of the repos.
+-->
+<Project>
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <EnableSourceLink Condition=" '$(NCrunch)' == '1' ">false</EnableSourceLink>
+    <ProjectName Condition=" '$(ProjectName)' == '' ">$(MSBuildProjectName)</ProjectName>
+    <BaseOutputPath>$([System.IO.Path]::GetFullPath($(MSBuildThisFileDirectory)..\build\))</BaseOutputPath>
+    <BaseIntermediateOutputPath>$(BaseOutputPath)obj\$(ProjectName)\</BaseIntermediateOutputPath>
+    <OutputPath>$(BaseOutputPath)$(Configuration)\</OutputPath>
+    <Authors>WiX Toolset Team</Authors>
+    <Company>WiX Toolset</Company>
+    <Copyright>Copyright (c) .NET Foundation and contributors. All rights reserved.</Copyright>
+    <PackageLicenseExpression>MS-RL</PackageLicenseExpression>
+    <Product>WiX Toolset</Product>
+  </PropertyGroup>
+  <Import Project="Directory$(MSBuildProjectExtension).props" Condition=" Exists('Directory$(MSBuildProjectExtension).props') " />
+  <Import Project="Custom.Build.props" Condition=" Exists('Custom.Build.props') " />
+</Project>
diff --git a/src/api/burn/Directory.Build.targets b/src/api/burn/Directory.Build.targets
new file mode 100644
index 00000000..44701fb6
--- /dev/null
+++ b/src/api/burn/Directory.Build.targets
@@ -0,0 +1,73 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<!--
+  Do NOT modify this file. Update the canonical version in Home\repo-template\src\Directory.Build.targets
+  then update all of the repos.
+-->
+<Project>
+  <PropertyGroup>
+    <SigningToolFolder>$(BaseOutputPath)obj\.tools</SigningToolFolder>
+    <SigningToolExe>$(SigningToolFolder)\SignClient.exe</SigningToolExe>
+    <SigningFilelist>$(SigningToolFolder)\empty-filelist.txt</SigningFilelist>
+    <SigningConfiguration>$([MSBuild]::GetDirectoryNameOfFileAbove($(MSBuildProjectDirectory), signing.json))\signing.json</SigningConfiguration>
+  </PropertyGroup>
+  <PropertyGroup>
+    <CreateDocumentation Condition=" '$(CreateDocumentationFile)'!='true' ">false</CreateDocumentation>
+    <DocumentationFile Condition=" '$(CreateDocumentationFile)'=='true' ">$(OutputPath)\$(AssemblyName).xml</DocumentationFile>
+  </PropertyGroup>
+  <Target Name="SetNuspecProperties" DependsOnTargets="InitializeSourceControlInformation" AfterTargets="GetBuildVersion"
+          Condition=" Exists('$(MSBuildProjectName).nuspec') ">
+    <PropertyGroup>
+      <ProjectUrl Condition=" '$(ProjectUrl)'=='' and '$(PrivateRepositoryUrl)'!='' ">$(PrivateRepositoryUrl.Replace('.git',''))</ProjectUrl>
+      <NuspecFile>$(MSBuildProjectName).nuspec</NuspecFile>
+      <NuspecBasePath Condition=" '$(NuspecBasePath)'=='' ">$(MSBuildProjectDirectory)</NuspecBasePath>
+      <NuspecProperties>$(NuspecProperties);Id=$(PackageId);Authors="$(Authors)";Configuration=$(Configuration);Copyright="$(Copyright)";Description="$(Description)";Title="$(Title)"</NuspecProperties>
+      <NuspecProperties>$(NuspecProperties);Version=$(NPMPackageVersion);RepositoryCommit=$(SourceRevisionId);RepositoryType=$(RepositoryType);RepositoryUrl=$(PrivateRepositoryUrl);ProjectFolder=$(MSBuildProjectDirectory)\;ProjectUrl=$(ProjectUrl)</NuspecProperties>
+      <PublishRepositoryUrl>true</PublishRepositoryUrl>
+      <SymbolPackageFormat>snupkg</SymbolPackageFormat>
+    </PropertyGroup>
+  </Target>
+  <Target Name="PackNative" DependsOnTargets="GetBuildVersion;SetNuspecProperties"
+          Condition=" Exists('$(MSBuildProjectName).nuspec') ">
+    <Exec Command='nuget pack $(NuspecFile) -OutputDirectory "$(BaseOutputPath)$(Configuration)" -BasePath "$(NuspecBasePath)" -Properties $(NuspecProperties)' 
+          WorkingDirectory="$(MSBuildProjectDirectory)" />
+    <ItemGroup>
+      <NuGetPackOutput Include="$(BaseOutputPath)$(Configuration)\**\$(PackageId)*.nupkg" />
+    </ItemGroup>
+  </Target>
+  <Target Name="_GetSignClient"
+          Condition=" !Exists('$(SigningToolExe)') ">
+    <WriteLinesToFile File='$(SigningFilelist)' Lines='do-not-sign-files-in-nupkg' Overwrite='true' />
+    <Exec Command='dotnet.exe tool install --tool-path "$(SigningToolFolder)" SignClient' />
+  </Target>
+  <Target Name="SignOutput" DependsOnTargets="_GetSignClient" AfterTargets="AfterBuild"
+          Condition=" '$(SigningUser)'!='' and '$(SignOutput)'!='false' and 
+                      ('$(MSBuildProjectExtension)'=='.csproj' or ('$(MSBuildProjectExtension)'=='.vcxproj' and '$(ConfigurationType)'!='StaticLibrary'))">
+    <Exec Command='"$(SigningToolExe)" sign -i $(TargetPath) -c "$(SigningConfiguration)" -n "WiX Toolset" -d "WiX Toolset" -u https://wixtoolset.org/ -r "$(SigningUser)" -s "$(SigningSecret)"'
+          WorkingDirectory="$(MSBuildProjectDirectory)" EchoOff="true" />
+  </Target>
+  <Target Name="SignNupkg" DependsOnTargets="_GetSignClient" AfterTargets="Pack;PackNative"
+          Condition=" '$(SigningUser)'!='' and '@(NuGetPackOutput)'!='' and '$(SignNupkg)'!='false' ">
+    <ItemGroup>
+      <SigningNupkgs Include="@(NuGetPackOutput)" Condition=" '%(Extension)'=='.nupkg' " />
+    </ItemGroup>
+    <Exec Command='"$(SigningToolExe)" sign -i "@(SigningNupkgs->&apos;%(Identity)&apos;)" -c "$(SigningConfiguration)" -f "$(SigningFilelist)" -n "WiX Toolset" -d "WiX Toolset" -u https://wixtoolset.org/ -r "$(SigningUser)" -s "$(SigningSecret)"'
+          WorkingDirectory="$(MSBuildProjectDirectory)" EchoOff="true" />
+  </Target>
+  <Import Project="Directory$(MSBuildProjectExtension).targets" Condition=" Exists('Directory$(MSBuildProjectExtension).targets') " />
+  <Import Project="Custom.Build.targets" Condition=" Exists('Custom.Build.targets') " />
+</Project>
diff --git a/src/api/burn/Directory.csproj.props b/src/api/burn/Directory.csproj.props
new file mode 100644
index 00000000..81d24ad1
--- /dev/null
+++ b/src/api/burn/Directory.csproj.props
@@ -0,0 +1,13 @@
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<!--
+  Do NOT modify this file. Update the canonical version in Home\repo-template\src\CSharp.Build.props
+  then update all of the repos.
+-->
+<Project>
+  <PropertyGroup>
+    <CheckForOverflowUnderflow>true</CheckForOverflowUnderflow>
+    <SignAssembly>true</SignAssembly>
+    <AssemblyOriginatorKeyFile>$([System.IO.Path]::GetFullPath($(MSBuildThisFileDirectory)wix.snk))</AssemblyOriginatorKeyFile>
+    <NBGV_EmitThisAssemblyClass>false</NBGV_EmitThisAssemblyClass>
+  </PropertyGroup>
+</Project>
diff --git a/src/api/burn/Directory.vcxproj.props b/src/api/burn/Directory.vcxproj.props
new file mode 100644
index 00000000..9ea7071b
--- /dev/null
+++ b/src/api/burn/Directory.vcxproj.props
@@ -0,0 +1,115 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project>
+  <PropertyGroup>
+    <Platform Condition=" '$(Platform)' == '' OR '$(Platform)' == 'AnyCPU' ">Win32</Platform>
+    <IntDir>$(BaseIntermediateOutputPath)$(Configuration)\$(Platform)\</IntDir>
+    <OutDir>$(OutputPath)$(Platform)\</OutDir>
+    <!-- NBGV properties -->
+    <AssemblyCompany>$(Company)</AssemblyCompany>
+    <AssemblyCopyright>$(Copyright)</AssemblyCopyright>
+    <RuntimeIdentifiers>win-x86;win-x64;win-arm64</RuntimeIdentifiers>
+    <NuGetTargetMoniker>native,Version=v0.0</NuGetTargetMoniker>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(WindowsTargetPlatformVersion)'=='' AND '$(VisualStudioVersion)'>='15.0'">
+    <WindowsTargetPlatformVersion>$([Microsoft.Build.Utilities.ToolLocationHelper]::GetLatestSDKTargetPlatformVersion('Windows', '10.0'))</WindowsTargetPlatformVersion>
+  </PropertyGroup>
+  <PropertyGroup>
+    <CodeAnalysisRuleSet Condition=" Exists('$(MSBuildThisFileDirectory)CustomizedNativeRecommendedRules.ruleset') ">$(MSBuildThisFileDirectory)CustomizedNativeRecommendedRules.ruleset</CodeAnalysisRuleSet>
+  </PropertyGroup>
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <DisableSpecificWarnings>$(DisableSpecificCompilerWarnings)</DisableSpecificWarnings>
+      <WarningLevel>Level4</WarningLevel>
+      <AdditionalIncludeDirectories>$(ProjectDir)inc;$(MSBuildProjectDirectory);$(IntDir);$(SqlCESdkIncludePath);$(ProjectAdditionalIncludeDirectories);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+      <PreprocessorDefinitions>WIN32;_WINDOWS;_WIN32_MSI=500;_WIN32_WINNT=0x0501;$(ArmPreprocessorDefinitions);$(UnicodePreprocessorDefinitions);_CRT_STDIO_LEGACY_WIDE_SPECIFIERS;_WINSOCK_DEPRECATED_NO_WARNINGS;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PrecompiledHeader>Use</PrecompiledHeader>
+      <PrecompiledHeaderFile>precomp.h</PrecompiledHeaderFile>
+      <CallingConvention Condition="'$(Platform)'=='Win32'">StdCall</CallingConvention>
+      <TreatWarningAsError>true</TreatWarningAsError>
+      <ExceptionHandling>false</ExceptionHandling>
+      <AdditionalOptions>-YlprecompDefine</AdditionalOptions>
+      <AdditionalOptions Condition=" $(PlatformToolset.StartsWith('v14')) ">/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
+      <MultiProcessorCompilation Condition=" $(NUMBER_OF_PROCESSORS) &gt; 4 ">true</MultiProcessorCompilation>
+    </ClCompile>
+    <ResourceCompile>
+      <PreprocessorDefinitions>$(ArmPreprocessorDefinitions);%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>$(ProjectAdditionalResourceIncludeDirectories);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+    <Lib>
+      <AdditionalLibraryDirectories>$(OutDir);$(AdditionalMultiTargetLibraryPath);$(ProjectAdditionalLibraryDirectories);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+    </Lib>
+    <Link>
+      <SubSystem>$(ProjectSubSystem)</SubSystem>
+      <ModuleDefinitionFile>$(ProjectModuleDefinitionFile)</ModuleDefinitionFile>
+      <NoEntryPoint>$(ResourceOnlyDll)</NoEntryPoint>
+      <GenerateDebugInformation>true</GenerateDebugInformation>
+      <AdditionalDependencies>$(ProjectAdditionalLinkLibraries);advapi32.lib;comdlg32.lib;user32.lib;oleaut32.lib;gdi32.lib;shell32.lib;ole32.lib;version.lib;%(AdditionalDependencies)</AdditionalDependencies>
+      <AdditionalLibraryDirectories>$(OutDir);$(AdditionalMultiTargetLibraryPath);$(ArmLibraryDirectories);$(ProjectAdditionalLinkLibraryDirectories);%(AdditionalLibraryDirectories)</AdditionalLibraryDirectories>
+      <AdditionalOptions Condition=" $(PlatformToolset.StartsWith('v14')) ">/IGNORE:4099 %(AdditionalOptions)</AdditionalOptions>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Platform)'=='Win32' and '$(PlatformToolset)'!='v100'">
+    <ClCompile>
+      <EnableEnhancedInstructionSet>NoExtensions</EnableEnhancedInstructionSet>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Platform)'=='arm' ">
+    <ClCompile>
+      <CallingConvention>CDecl</CallingConvention>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(ConfigurationType)'=='StaticLibrary' ">
+    <ClCompile>
+      <DebugInformationFormat>OldStyle</DebugInformationFormat>
+      <OmitDefaultLibName>true</OmitDefaultLibName>
+      <IgnoreAllDefaultLibraries>true</IgnoreAllDefaultLibraries>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Configuration)'=='Debug' ">
+    <ClCompile>
+      <Optimization>Disabled</Optimization>
+      <BasicRuntimeChecks>EnableFastChecks</BasicRuntimeChecks>
+      <PreprocessorDefinitions>_DEBUG;DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Configuration)'=='Debug' and '$(CLRSupport)'=='true' ">
+    <ClCompile>
+      <BasicRuntimeChecks></BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDebugDll</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Configuration)'=='Release' ">
+    <ClCompile>
+      <Optimization>MinSpace</Optimization>
+      <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <FunctionLevelLinking>true</FunctionLevelLinking>
+      <IntrinsicFunctions>true</IntrinsicFunctions>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+    </ClCompile>
+    <Link>
+      <EnableCOMDATFolding>true</EnableCOMDATFolding>
+      <OptimizeReferences>true</OptimizeReferences>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(Configuration)'=='Release' and '$(CLRSupport)'=='true' ">
+    <ClCompile>
+      <BasicRuntimeChecks></BasicRuntimeChecks>
+      <RuntimeLibrary>MultiThreadedDll</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" '$(CLRSupport)'=='true' ">
+    <Link>
+      <KeyFile>$(LinkKeyFile)</KeyFile>
+      <DelaySign>$(LinkDelaySign)</DelaySign>
+    </Link>
+  </ItemDefinitionGroup>
+</Project>
diff --git a/src/api/burn/NativeMultiTargeting.Build.props b/src/api/burn/NativeMultiTargeting.Build.props
new file mode 100644
index 00000000..1ff46559
--- /dev/null
+++ b/src/api/burn/NativeMultiTargeting.Build.props
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project>
+  <!-- Overrides the standard Cpp.Build.props to include the PlatformToolset in the output path. -->
+  <PropertyGroup>
+    <IntDir>$(BaseIntermediateOutputPath)$(Configuration)\$(PlatformToolset)\$(PlatformTarget)\</IntDir>
+    <OutDir>$(OutputPath)$(PlatformToolset)\$(PlatformTarget)\</OutDir>
+  </PropertyGroup>
+</Project>
diff --git a/src/api/burn/README.md b/src/api/burn/README.md
new file mode 100644
index 00000000..380bbda3
--- /dev/null
+++ b/src/api/burn/README.md
@@ -0,0 +1,2 @@
+# balutil
+balutil.lib - WiX Toolset Bootstrapper Application Layer native utility library
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.nuspec b/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.nuspec
new file mode 100644
index 00000000..b10b75d2
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.nuspec
@@ -0,0 +1,19 @@
+<?xml version="1.0"?>
+<package >
+  <metadata>
+    <id>$id$</id>
+    <version>$version$</version>
+    <authors>WiX Toolset Team</authors>
+    <owners>WiX Toolset Team</owners>
+    <license type="expression">MS-RL</license>
+    <projectUrl>https://github.com/wixtoolset/BootstrapperCore</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>$description$</description>
+    <copyright>$copyright$</copyright>
+  </metadata>
+  <files>
+    <file src="build\$id$.props" target="build\" />
+    <file src="inc\*" target="build\native\include" />
+  </files>
+</package>
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.proj b/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.proj
new file mode 100644
index 00000000..0899bdcf
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/WixToolset.BootstrapperCore.Native.proj
@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project ToolsVersion="4.0" DefaultTargets="Pack" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <PropertyGroup>
+    <PackageId>WixToolset.BootstrapperCore.Native</PackageId>
+    <Description>WiX Bootstrapper native interfaces</Description>
+  </PropertyGroup>
+  <Target Name="PackNative" DependsOnTargets="GetBuildVersion">
+    <Exec Command='nuget pack $(PackageId).nuspec -OutputDirectory "$(BaseOutputPath)$(Configuration)" -Properties Id=$(PackageId);Version="$(BuildVersionSimple)";Authors="$(Authors)";Copyright="$(Copyright)";Description="$(Description)"' />
+  </Target>
+  
+  <Import Project="..\Directory.Build.props" />  
+  <!-- <Import Project="..\Directory.Build.targets" /> -->
+  <Import Project="..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" />
+</Project>
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/build/WixToolset.BootstrapperCore.Native.props b/src/api/burn/WixToolset.BootstrapperCore.Native/build/WixToolset.BootstrapperCore.Native.props
new file mode 100644
index 00000000..82f81163
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/build/WixToolset.BootstrapperCore.Native.props
@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <ResourceCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+</Project>
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h
new file mode 100644
index 00000000..2a6d5c8a
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperApplication.h
@@ -0,0 +1,1318 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+enum BOOTSTRAPPER_DISPLAY
+{
+    BOOTSTRAPPER_DISPLAY_UNKNOWN,
+    BOOTSTRAPPER_DISPLAY_EMBEDDED,
+    BOOTSTRAPPER_DISPLAY_NONE,
+    BOOTSTRAPPER_DISPLAY_PASSIVE,
+    BOOTSTRAPPER_DISPLAY_FULL,
+};
+enum BOOTSTRAPPER_RESTART
+{
+    BOOTSTRAPPER_RESTART_UNKNOWN,
+    BOOTSTRAPPER_RESTART_NEVER,
+    BOOTSTRAPPER_RESTART_PROMPT,
+    BOOTSTRAPPER_RESTART_AUTOMATIC,
+    BOOTSTRAPPER_RESTART_ALWAYS,
+};
+enum BOOTSTRAPPER_RESUME_TYPE
+{
+    BOOTSTRAPPER_RESUME_TYPE_NONE,
+    BOOTSTRAPPER_RESUME_TYPE_INVALID,        // resume information is present but invalid
+    BOOTSTRAPPER_RESUME_TYPE_INTERRUPTED,    // relaunched after an unexpected interruption
+    BOOTSTRAPPER_RESUME_TYPE_REBOOT_PENDING, // reboot has not taken place yet
+    BOOTSTRAPPER_RESUME_TYPE_REBOOT,         // relaunched after reboot
+    BOOTSTRAPPER_RESUME_TYPE_SUSPEND,        // relaunched after suspend
+    BOOTSTRAPPER_RESUME_TYPE_ARP,            // launched from ARP
+};
+enum BOOTSTRAPPER_ERROR_TYPE
+{
+    BOOTSTRAPPER_ERROR_TYPE_ELEVATE,            // error occurred trying to elevate.
+    BOOTSTRAPPER_ERROR_TYPE_WINDOWS_INSTALLER,  // error came from windows installer.
+    BOOTSTRAPPER_ERROR_TYPE_EXE_PACKAGE,        // error came from an exe package.
+    BOOTSTRAPPER_ERROR_TYPE_HTTP_AUTH_SERVER,   // error occurred trying to authenticate with HTTP server.
+    BOOTSTRAPPER_ERROR_TYPE_HTTP_AUTH_PROXY,    // error occurred trying to authenticate with HTTP proxy.
+    BOOTSTRAPPER_ERROR_TYPE_APPLY,              // error occurred during apply.
+};
+enum BOOTSTRAPPER_RELATED_OPERATION
+{
+    BOOTSTRAPPER_RELATED_OPERATION_NONE,
+    BOOTSTRAPPER_RELATED_OPERATION_DOWNGRADE,
+    BOOTSTRAPPER_RELATED_OPERATION_MINOR_UPDATE,
+    BOOTSTRAPPER_RELATED_OPERATION_MAJOR_UPGRADE,
+    BOOTSTRAPPER_RELATED_OPERATION_REMOVE,
+    BOOTSTRAPPER_RELATED_OPERATION_INSTALL,
+    BOOTSTRAPPER_RELATED_OPERATION_REPAIR,
+};
+enum BOOTSTRAPPER_CACHE_OPERATION
+{
+    // There is no source available.
+    BOOTSTRAPPER_CACHE_OPERATION_NONE,
+    // Copy the payload or container from the chosen local source.
+    BOOTSTRAPPER_CACHE_OPERATION_COPY,
+    // Download the payload or container using the download URL.
+    BOOTSTRAPPER_CACHE_OPERATION_DOWNLOAD,
+    // Extract the payload from the container.
+    BOOTSTRAPPER_CACHE_OPERATION_EXTRACT,
+};
+enum BOOTSTRAPPER_CACHE_RESOLVE_OPERATION
+{
+    // There is no source available.
+    BOOTSTRAPPER_CACHE_RESOLVE_NONE,
+    // Copy the payload or container from the chosen local source.
+    BOOTSTRAPPER_CACHE_RESOLVE_LOCAL,
+    // Download the payload or container from the download URL.
+    BOOTSTRAPPER_CACHE_RESOLVE_DOWNLOAD,
+    // Extract the payload from the container.
+    BOOTSTRAPPER_CACHE_RESOLVE_CONTAINER,
+    // Look again for the payload or container locally.
+    BOOTSTRAPPER_CACHE_RESOLVE_RETRY,
+};
+enum BOOTSTRAPPER_CACHE_VERIFY_STEP
+{
+    BOOTSTRAPPER_CACHE_VERIFY_STEP_STAGE,
+    BOOTSTRAPPER_CACHE_VERIFY_STEP_HASH,
+    BOOTSTRAPPER_CACHE_VERIFY_STEP_FINALIZE,
+};
+enum BOOTSTRAPPER_APPLY_RESTART
+{
+    BOOTSTRAPPER_APPLY_RESTART_NONE,
+    BOOTSTRAPPER_APPLY_RESTART_REQUIRED,
+    BOOTSTRAPPER_APPLY_RESTART_INITIATED,
+};
+enum BOOTSTRAPPER_RELATION_TYPE
+{
+    BOOTSTRAPPER_RELATION_NONE,
+    BOOTSTRAPPER_RELATION_DETECT,
+    BOOTSTRAPPER_RELATION_UPGRADE,
+    BOOTSTRAPPER_RELATION_ADDON,
+    BOOTSTRAPPER_RELATION_PATCH,
+    BOOTSTRAPPER_RELATION_DEPENDENT,
+    BOOTSTRAPPER_RELATION_UPDATE,
+};
+enum BOOTSTRAPPER_CACHE_TYPE
+{
+    BOOTSTRAPPER_CACHE_TYPE_REMOVE,
+    BOOTSTRAPPER_CACHE_TYPE_KEEP,
+    BOOTSTRAPPER_CACHE_TYPE_FORCE,
+};
+enum BOOTSTRAPPER_PACKAGE_CONDITION_RESULT
+{
+    BOOTSTRAPPER_PACKAGE_CONDITION_DEFAULT,
+    BOOTSTRAPPER_PACKAGE_CONDITION_FALSE,
+    BOOTSTRAPPER_PACKAGE_CONDITION_TRUE,
+};
+enum BOOTSTRAPPER_APPLICATION_MESSAGE
+{
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONSTARTUP,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONSHUTDOWN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMSHUTDOWN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTFORWARDCOMPATIBLEBUNDLE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDMSIPACKAGE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPATCHTARGET,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTMSIFEATURE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPATCHTARGET,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIFEATURE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPROGRESS,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONERROR,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREPROGRESS,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRERESOLVING,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPATCHTARGET,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROGRESS,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEMSIMESSAGE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEFILESINUSE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXEBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXECOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIPACKAGE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANNEDPACKAGE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANFORWARDCOMPATIBLEBUNDLE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYPROGRESS,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTBEGIN,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTCOMPLETE,
+    BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTPROGRESS,
+};
+enum BOOTSTRAPPER_APPLYCOMPLETE_ACTION
+{
+    BOOTSTRAPPER_APPLYCOMPLETE_ACTION_NONE,
+    // Instructs the engine to restart.
+    // The engine will not launch again after the machine is rebooted.
+    // Ignored if reboot was already initiated by OnExecutePackageComplete().
+    BOOTSTRAPPER_APPLYCOMPLETE_ACTION_RESTART,
+};
+enum BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION
+{
+    BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION_NONE,
+    // Instructs the engine to try the acquisition of the payload again.
+    // Ignored if hrStatus is a success.
+    BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION_RETRY,
+};
+enum BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION
+{
+    BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION_NONE,
+    // Instructs the engine to ignore non-vital package failures and
+    // continue with the caching.
+    // Ignored if hrStatus is a success or the package is vital.
+    BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION_IGNORE,
+    // Instructs the engine to try the acquisition and verification of the package again.
+    // Ignored if hrStatus is a success.
+    BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION_RETRY,
+};
+enum BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION
+{
+    BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION_NONE,
+    // Ignored if hrStatus is a success.
+    BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION_RETRYVERIFICATION,
+    // Ignored if hrStatus is a success.
+    BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION_RETRYACQUISITION,
+};
+enum BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION
+{
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_NONE,
+    // Instructs the engine to ignore non-vital package failures and
+    // continue with the install.
+    // Ignored if hrStatus is a success or the package is vital.
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_IGNORE,
+    // Instructs the engine to try the execution of the package again.
+    // Ignored if hrStatus is a success.
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_RETRY,
+    // Instructs the engine to stop processing the chain and restart.
+    // The engine will launch again after the machine is restarted.
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_RESTART,
+    // Instructs the engine to stop processing the chain and
+    // suspend the current state.
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_SUSPEND,
+};
+enum BOOTSTRAPPER_SHUTDOWN_ACTION
+{
+    BOOTSTRAPPER_SHUTDOWN_ACTION_NONE,
+    // Instructs the engine to restart.
+    // The engine will not launch again after the machine is rebooted.
+    // Ignored if reboot was already initiated by OnExecutePackageComplete().
+    BOOTSTRAPPER_SHUTDOWN_ACTION_RESTART,
+    // Instructs the engine to unload the bootstrapper application and
+    // restart the engine which will load the bootstrapper application again.
+    // Typically used to switch from a native bootstrapper application to a managed one.
+    BOOTSTRAPPER_SHUTDOWN_ACTION_RELOAD_BOOTSTRAPPER,
+    // Opts out of the engine behavior of trying to uninstall itself
+    // when no non-permanent packages are installed.
+    BOOTSTRAPPER_SHUTDOWN_ACTION_SKIP_CLEANUP,
+};
+enum BURN_MSI_PROPERTY
+{
+    BURN_MSI_PROPERTY_NONE,     // no property added
+    BURN_MSI_PROPERTY_INSTALL,  // add BURNMSIINSTALL=1
+    BURN_MSI_PROPERTY_MODIFY,   // add BURNMSIMODIFY=1
+    BURN_MSI_PROPERTY_REPAIR,   // add BURNMSIREPAIR=1
+    BURN_MSI_PROPERTY_UNINSTALL,// add BURNMSIUNINSTALL=1
+};
+struct BOOTSTRAPPER_COMMAND
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_ACTION action;
+    BOOTSTRAPPER_DISPLAY display;
+    BOOTSTRAPPER_RESTART restart;
+    LPWSTR wzCommandLine;
+    int nCmdShow;
+    BOOTSTRAPPER_RESUME_TYPE resumeType;
+    HWND hwndSplashScreen;
+    // If this was run from a related bundle, specifies the relation type
+    BOOTSTRAPPER_RELATION_TYPE relationType;
+    BOOL fPassthrough;
+    LPWSTR wzLayoutDirectory;
+    LPWSTR wzBootstrapperWorkingFolder;
+    LPWSTR wzBootstrapperApplicationDataPath;
+};
+struct BA_ONAPPLYBEGIN_ARGS
+{
+    DWORD cbSize;
+    DWORD dwPhaseCount;
+};
+struct BA_ONAPPLYBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONAPPLYCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+    // Indicates whether any package required a reboot or initiated the reboot already.
+    BOOTSTRAPPER_APPLY_RESTART restart;
+    BOOTSTRAPPER_APPLYCOMPLETE_ACTION recommendation;
+};
+struct BA_ONAPPLYCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_APPLYCOMPLETE_ACTION action;
+};
+struct BA_ONBEGINMSITRANSACTIONBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+};
+struct BA_ONBEGINMSITRANSACTIONBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONBEGINMSITRANSACTIONCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+    HRESULT hrStatus;
+};
+struct BA_ONBEGINMSITRANSACTIONCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONCACHEACQUIREBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    LPCWSTR wzSource;
+    LPCWSTR wzDownloadUrl;
+    LPCWSTR wzPayloadContainerId;
+    BOOTSTRAPPER_CACHE_OPERATION recommendation;
+};
+struct BA_ONCACHEACQUIREBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOTSTRAPPER_CACHE_OPERATION action;
+};
+struct BA_ONCACHEACQUIRECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    HRESULT hrStatus;
+    BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION recommendation;
+};
+struct BA_ONCACHEACQUIRECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION action;
+};
+struct BA_ONCACHEACQUIREPROGRESS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    DWORD64 dw64Progress;
+    DWORD64 dw64Total;
+    DWORD dwOverallPercentage;
+};
+struct BA_ONCACHEACQUIREPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEACQUIRERESOLVING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    LPCWSTR* rgSearchPaths;
+    DWORD cSearchPaths;
+    BOOL fFoundLocal;
+    DWORD dwRecommendedSearchPath;
+    LPCWSTR wzDownloadUrl;
+    LPCWSTR wzPayloadContainerId;
+    BOOTSTRAPPER_CACHE_RESOLVE_OPERATION recommendation;
+};
+struct BA_ONCACHEACQUIRERESOLVING_RESULTS
+{
+    DWORD cbSize;
+    DWORD dwChosenSearchPath;
+    BOOTSTRAPPER_CACHE_RESOLVE_OPERATION action;
+    BOOL fCancel;
+};
+struct BA_ONCACHEBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONCACHEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONCACHECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    HRESULT hrStatus;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    DWORD64 dw64Progress;
+    DWORD64 dw64Total;
+    DWORD dwOverallPercentage;
+};
+struct BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEPACKAGEBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    DWORD cCachePayloads;
+    DWORD64 dw64PackageCacheSize;
+};
+struct BA_ONCACHEPACKAGEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEPACKAGECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    HRESULT hrStatus;
+    BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION recommendation;
+};
+struct BA_ONCACHEPACKAGECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION action;
+};
+struct BA_ONCACHEPAYLOADEXTRACTBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzContainerId;
+    LPCWSTR wzPayloadId;
+};
+struct BA_ONCACHEPAYLOADEXTRACTBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEPAYLOADEXTRACTCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzContainerId;
+    LPCWSTR wzPayloadId;
+    HRESULT hrStatus;
+};
+struct BA_ONCACHEPAYLOADEXTRACTCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONCACHEPAYLOADEXTRACTPROGRESS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzContainerId;
+    LPCWSTR wzPayloadId;
+    DWORD64 dw64Progress;
+    DWORD64 dw64Total;
+    DWORD dwOverallPercentage;
+};
+struct BA_ONCACHEPAYLOADEXTRACTPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEVERIFYBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+};
+struct BA_ONCACHEVERIFYBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCACHEVERIFYCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    HRESULT hrStatus;
+    BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION recommendation;
+};
+struct BA_ONCACHEVERIFYCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION action;
+};
+struct BA_ONCACHEVERIFYPROGRESS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    DWORD64 dw64Progress;
+    DWORD64 dw64Total;
+    DWORD dwOverallPercentage;
+    BOOTSTRAPPER_CACHE_VERIFY_STEP verifyStep;
+};
+struct BA_ONCACHEVERIFYPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCOMMITMSITRANSACTIONBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+};
+struct BA_ONCOMMITMSITRANSACTIONBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONCOMMITMSITRANSACTIONCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+    HRESULT hrStatus;
+};
+struct BA_ONCOMMITMSITRANSACTIONCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONDETECTBEGIN_ARGS
+{
+    DWORD cbSize;
+    BOOL fInstalled;
+    DWORD cPackages;
+    BOOL fCached;
+};
+struct BA_ONDETECTBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+    BOOL fEligibleForCleanup;
+};
+struct BA_ONDETECTCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzBundleId;
+    BOOTSTRAPPER_RELATION_TYPE relationType;
+    LPCWSTR wzBundleTag;
+    BOOL fPerMachine;
+    LPCWSTR wzVersion;
+    BOOL fMissingFromCache;
+};
+struct BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTMSIFEATURE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzFeatureId;
+    BOOTSTRAPPER_FEATURE_STATE state;
+};
+struct BA_ONDETECTMSIFEATURE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTPACKAGEBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+};
+struct BA_ONDETECTPACKAGEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTPACKAGECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    HRESULT hrStatus;
+    BOOTSTRAPPER_PACKAGE_STATE state;
+    BOOL fCached;
+};
+struct BA_ONDETECTPACKAGECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONDETECTRELATEDBUNDLE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzBundleId;
+    BOOTSTRAPPER_RELATION_TYPE relationType;
+    LPCWSTR wzBundleTag;
+    BOOL fPerMachine;
+    LPCWSTR wzVersion;
+    BOOTSTRAPPER_RELATED_OPERATION operation;
+    BOOL fMissingFromCache;
+};
+struct BA_ONDETECTRELATEDBUNDLE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTRELATEDMSIPACKAGE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzUpgradeCode;
+    LPCWSTR wzProductCode;
+    BOOL fPerMachine;
+    LPCWSTR wzVersion;
+    BOOTSTRAPPER_RELATED_OPERATION operation;
+};
+struct BA_ONDETECTRELATEDMSIPACKAGE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTPATCHTARGET_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzProductCode;
+    BOOTSTRAPPER_PACKAGE_STATE patchState;
+};
+struct BA_ONDETECTPATCHTARGET_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONDETECTUPDATE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzUpdateLocation;
+    DWORD64 dw64Size;
+    LPCWSTR wzVersion;
+    LPCWSTR wzTitle;
+    LPCWSTR wzSummary;
+    LPCWSTR wzContentType;
+    LPCWSTR wzContent;
+};
+struct BA_ONDETECTUPDATE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOL fStopProcessingUpdates;
+};
+struct BA_ONDETECTUPDATEBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzUpdateLocation;
+};
+struct BA_ONDETECTUPDATEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOL fSkip;
+};
+struct BA_ONDETECTUPDATECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONDETECTUPDATECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fIgnoreError;
+};
+struct BA_ONELEVATEBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONELEVATEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONELEVATECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONELEVATECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONERROR_ARGS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_ERROR_TYPE errorType;
+    LPCWSTR wzPackageId;
+    DWORD dwCode;
+    LPCWSTR wzError;
+    DWORD dwUIHint;
+    DWORD cData;
+    LPCWSTR* rgwzData;
+    int nRecommendation;
+};
+struct BA_ONERROR_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+};
+struct BA_ONEXECUTEBEGIN_ARGS
+{
+    DWORD cbSize;
+    DWORD cExecutingPackages;
+};
+struct BA_ONEXECUTEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONEXECUTECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONEXECUTECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONEXECUTEFILESINUSE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    DWORD cFiles;
+    LPCWSTR* rgwzFiles;
+    int nRecommendation;
+};
+struct BA_ONEXECUTEFILESINUSE_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+};
+struct BA_ONEXECUTEMSIMESSAGE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    INSTALLMESSAGE messageType;
+    DWORD dwUIHint;
+    LPCWSTR wzMessage;
+    DWORD cData;
+    LPCWSTR* rgwzData;
+    int nRecommendation;
+};
+struct BA_ONEXECUTEMSIMESSAGE_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+};
+struct BA_ONEXECUTEPACKAGEBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    BOOL fExecute; // false means rollback.
+    BOOTSTRAPPER_ACTION_STATE action;
+    INSTALLUILEVEL uiLevel;
+    BOOL fDisableExternalUiHandler;
+};
+struct BA_ONEXECUTEPACKAGEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONEXECUTEPACKAGECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    HRESULT hrStatus;
+    // Indicates whether this package requires a reboot or initiated the reboot already.
+    BOOTSTRAPPER_APPLY_RESTART restart;
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION recommendation;
+};
+struct BA_ONEXECUTEPACKAGECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION action;
+};
+struct BA_ONEXECUTEPATCHTARGET_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzTargetProductCode;
+};
+struct BA_ONEXECUTEPATCHTARGET_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONEXECUTEPROGRESS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    DWORD dwProgressPercentage;
+    DWORD dwOverallPercentage;
+};
+struct BA_ONEXECUTEPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONLAUNCHAPPROVEDEXEBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONLAUNCHAPPROVEDEXEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONLAUNCHAPPROVEDEXECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+    // Only valid if the operation succeeded.
+    DWORD dwProcessId;
+};
+struct BA_ONLAUNCHAPPROVEDEXECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPAUSEAUTOMATICUPDATESBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONPAUSEAUTOMATICUPDATESBEGIN_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPLANBEGIN_ARGS
+{
+    DWORD cbSize;
+    DWORD cPackages;
+};
+struct BA_ONPLANBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONPLANCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONPLANCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPLANFORWARDCOMPATIBLEBUNDLE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzBundleId;
+    BOOTSTRAPPER_RELATION_TYPE relationType;
+    LPCWSTR wzBundleTag;
+    BOOL fPerMachine;
+    LPCWSTR wzVersion;
+    BOOL fRecommendedIgnoreBundle;
+};
+struct BA_ONPLANFORWARDCOMPATIBLEBUNDLE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOL fIgnoreBundle;
+};
+struct BA_ONPLANMSIFEATURE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzFeatureId;
+    BOOTSTRAPPER_FEATURE_STATE recommendedState;
+};
+struct BA_ONPLANMSIFEATURE_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_FEATURE_STATE requestedState;
+    BOOL fCancel;
+};
+struct BA_ONPLANMSIPACKAGE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    BOOL fExecute; // false means rollback.
+    BOOTSTRAPPER_ACTION_STATE action;
+};
+struct BA_ONPLANMSIPACKAGE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BURN_MSI_PROPERTY actionMsiProperty;
+    INSTALLUILEVEL uiLevel;
+    BOOL fDisableExternalUiHandler;
+};
+struct BA_ONPLANNEDPACKAGE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    BOOTSTRAPPER_ACTION_STATE execute;
+    BOOTSTRAPPER_ACTION_STATE rollback;
+    BOOL fPlannedCache;
+    BOOL fPlannedUncache;
+};
+struct BA_ONPLANNEDPACKAGE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPLANPACKAGEBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    BOOTSTRAPPER_PACKAGE_STATE state;
+    BOOL fCached;
+    BOOTSTRAPPER_PACKAGE_CONDITION_RESULT installCondition;
+    BOOTSTRAPPER_REQUEST_STATE recommendedState;
+    BOOTSTRAPPER_CACHE_TYPE recommendedCacheType;
+};
+struct BA_ONPLANPACKAGEBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOTSTRAPPER_REQUEST_STATE requestedState;
+    BOOTSTRAPPER_CACHE_TYPE requestedCacheType;
+};
+struct BA_ONPLANPACKAGECOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    HRESULT hrStatus;
+    BOOTSTRAPPER_REQUEST_STATE requested;
+};
+struct BA_ONPLANPACKAGECOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONPLANRELATEDBUNDLE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzBundleId;
+    BOOTSTRAPPER_REQUEST_STATE recommendedState;
+};
+struct BA_ONPLANRELATEDBUNDLE_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+    BOOTSTRAPPER_REQUEST_STATE requestedState;
+};
+struct BA_ONPLANPATCHTARGET_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageId;
+    LPCWSTR wzProductCode;
+    BOOTSTRAPPER_REQUEST_STATE recommendedState;
+};
+struct BA_ONPLANPATCHTARGET_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_REQUEST_STATE requestedState;
+    BOOL fCancel;
+};
+struct BA_ONPROGRESS_ARGS
+{
+    DWORD cbSize;
+    DWORD dwProgressPercentage;
+    DWORD dwOverallPercentage;
+};
+struct BA_ONPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONREGISTERBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONREGISTERBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONREGISTERCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONREGISTERCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONROLLBACKMSITRANSACTIONBEGIN_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+};
+struct BA_ONROLLBACKMSITRANSACTIONBEGIN_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONROLLBACKMSITRANSACTIONCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzTransactionId;
+    HRESULT hrStatus;
+};
+struct BA_ONROLLBACKMSITRANSACTIONCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONSHUTDOWN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONSHUTDOWN_RESULTS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_SHUTDOWN_ACTION action;
+};
+struct BA_ONSTARTUP_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONSTARTUP_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONSYSTEMRESTOREPOINTBEGIN_ARGS
+{
+    DWORD cbSize;
+};
+struct BA_ONSYSTEMRESTOREPOINTBEGIN_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONSYSTEMRESTOREPOINTCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONSYSTEMRESTOREPOINTCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_ONSYSTEMSHUTDOWN_ARGS
+{
+    DWORD cbSize;
+    DWORD dwEndSession;
+};
+struct BA_ONSYSTEMSHUTDOWN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fCancel;
+};
+struct BA_ONUNREGISTERBEGIN_ARGS
+{
+    DWORD cbSize;
+    BOOL fKeepRegistration;
+};
+struct BA_ONUNREGISTERBEGIN_RESULTS
+{
+    DWORD cbSize;
+    BOOL fForceKeepRegistration;
+};
+struct BA_ONUNREGISTERCOMPLETE_ARGS
+{
+    DWORD cbSize;
+    HRESULT hrStatus;
+};
+struct BA_ONUNREGISTERCOMPLETE_RESULTS
+{
+    DWORD cbSize;
+};
+extern "C" typedef HRESULT(WINAPI *PFN_BOOTSTRAPPER_APPLICATION_PROC)(
+    __in BOOTSTRAPPER_APPLICATION_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    );
+extern "C" typedef void (WINAPI *PFN_BOOTSTRAPPER_APPLICATION_DESTROY)();
+struct BOOTSTRAPPER_CREATE_ARGS
+{
+    DWORD cbSize;
+    DWORD64 qwEngineAPIVersion;
+    PFN_BOOTSTRAPPER_ENGINE_PROC pfnBootstrapperEngineProc;
+    LPVOID pvBootstrapperEngineProcContext;
+    BOOTSTRAPPER_COMMAND* pCommand;
+};
+struct BOOTSTRAPPER_CREATE_RESULTS
+{
+    DWORD cbSize;
+    PFN_BOOTSTRAPPER_APPLICATION_PROC pfnBootstrapperApplicationProc;
+    LPVOID pvBootstrapperApplicationProcContext;
+    BOOL fDisableUnloading; // indicates the BA dll must not be unloaded after BootstrapperApplicationDestroy.
+};
+extern "C" typedef HRESULT(WINAPI *PFN_BOOTSTRAPPER_APPLICATION_CREATE)(
+    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+    __inout BOOTSTRAPPER_CREATE_RESULTS* pResults
+    );
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h
new file mode 100644
index 00000000..9c9b38a5
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BootstrapperEngine.h
@@ -0,0 +1,442 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#if defined(__cplusplus)
+extern "C" {
+#endif
+#define IDERROR -1
+#define IDNOACTION 0
+#ifndef FACILITY_WIX
+#define FACILITY_WIX 500
+#endif
+static const HRESULT E_SUSPECTED_AV_INTERFERENCE = MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIX, 2000);
+// Note that ordering of the enumeration values is important.
+// Some code paths use < or > comparisions and simply reording values will break those comparisons.
+enum BOOTSTRAPPER_ACTION
+{
+    BOOTSTRAPPER_ACTION_UNKNOWN,
+    BOOTSTRAPPER_ACTION_HELP,
+    BOOTSTRAPPER_ACTION_LAYOUT,
+    BOOTSTRAPPER_ACTION_UNINSTALL,
+    BOOTSTRAPPER_ACTION_CACHE,
+    BOOTSTRAPPER_ACTION_INSTALL,
+    BOOTSTRAPPER_ACTION_MODIFY,
+    BOOTSTRAPPER_ACTION_REPAIR,
+    BOOTSTRAPPER_ACTION_UPDATE_REPLACE,
+    BOOTSTRAPPER_ACTION_UPDATE_REPLACE_EMBEDDED,
+};
+enum BOOTSTRAPPER_ACTION_STATE
+{
+    BOOTSTRAPPER_ACTION_STATE_NONE,
+    BOOTSTRAPPER_ACTION_STATE_UNINSTALL,
+    BOOTSTRAPPER_ACTION_STATE_INSTALL,
+    BOOTSTRAPPER_ACTION_STATE_MODIFY,
+    BOOTSTRAPPER_ACTION_STATE_MEND,
+    BOOTSTRAPPER_ACTION_STATE_REPAIR,
+    BOOTSTRAPPER_ACTION_STATE_MINOR_UPGRADE,
+};
+enum BOOTSTRAPPER_PACKAGE_STATE
+{
+    BOOTSTRAPPER_PACKAGE_STATE_UNKNOWN,
+    BOOTSTRAPPER_PACKAGE_STATE_OBSOLETE,
+    BOOTSTRAPPER_PACKAGE_STATE_ABSENT,
+    BOOTSTRAPPER_PACKAGE_STATE_PRESENT,
+    BOOTSTRAPPER_PACKAGE_STATE_SUPERSEDED,
+};
+enum BOOTSTRAPPER_REQUEST_STATE
+{
+    BOOTSTRAPPER_REQUEST_STATE_NONE,
+    BOOTSTRAPPER_REQUEST_STATE_FORCE_ABSENT,
+    BOOTSTRAPPER_REQUEST_STATE_ABSENT,
+    BOOTSTRAPPER_REQUEST_STATE_CACHE,
+    BOOTSTRAPPER_REQUEST_STATE_PRESENT,
+    BOOTSTRAPPER_REQUEST_STATE_MEND,
+    BOOTSTRAPPER_REQUEST_STATE_REPAIR,
+};
+enum BOOTSTRAPPER_FEATURE_STATE
+{
+    BOOTSTRAPPER_FEATURE_STATE_UNKNOWN,
+    BOOTSTRAPPER_FEATURE_STATE_ABSENT,
+    BOOTSTRAPPER_FEATURE_STATE_ADVERTISED,
+    BOOTSTRAPPER_FEATURE_STATE_LOCAL,
+    BOOTSTRAPPER_FEATURE_STATE_SOURCE,
+};
+enum BOOTSTRAPPER_LOG_LEVEL
+{
+    BOOTSTRAPPER_LOG_LEVEL_NONE,      // turns off report (only valid for XXXSetLevel())
+    BOOTSTRAPPER_LOG_LEVEL_STANDARD,  // written if reporting is on
+    BOOTSTRAPPER_LOG_LEVEL_VERBOSE,   // written only if verbose reporting is on
+    BOOTSTRAPPER_LOG_LEVEL_DEBUG,     // reporting useful when debugging code
+    BOOTSTRAPPER_LOG_LEVEL_ERROR,     // always gets reported, but can never be specified
+};
+enum BOOTSTRAPPER_UPDATE_HASH_TYPE
+{
+    BOOTSTRAPPER_UPDATE_HASH_TYPE_NONE,
+    BOOTSTRAPPER_UPDATE_HASH_TYPE_SHA512,
+};
+enum BOOTSTRAPPER_ENGINE_MESSAGE
+{
+    BOOTSTRAPPER_ENGINE_MESSAGE_GETPACKAGECOUNT,
+    BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLENUMERIC,
+    BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLESTRING,
+    BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLEVERSION,
+    BOOTSTRAPPER_ENGINE_MESSAGE_FORMATSTRING,
+    BOOTSTRAPPER_ENGINE_MESSAGE_ESCAPESTRING,
+    BOOTSTRAPPER_ENGINE_MESSAGE_EVALUATECONDITION,
+    BOOTSTRAPPER_ENGINE_MESSAGE_LOG,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SENDEMBEDDEDERROR,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SENDEMBEDDEDPROGRESS,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETUPDATE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETLOCALSOURCE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETDOWNLOADSOURCE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLENUMERIC,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLESTRING,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLEVERSION,
+    BOOTSTRAPPER_ENGINE_MESSAGE_CLOSESPLASHSCREEN,
+    BOOTSTRAPPER_ENGINE_MESSAGE_DETECT,
+    BOOTSTRAPPER_ENGINE_MESSAGE_PLAN,
+    BOOTSTRAPPER_ENGINE_MESSAGE_ELEVATE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_APPLY,
+    BOOTSTRAPPER_ENGINE_MESSAGE_QUIT,
+    BOOTSTRAPPER_ENGINE_MESSAGE_LAUNCHAPPROVEDEXE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_SETUPDATESOURCE,
+    BOOTSTRAPPER_ENGINE_MESSAGE_COMPAREVERSIONS,
+};
+typedef struct _BAENGINE_APPLY_ARGS
+{
+    DWORD cbSize;
+    HWND hwndParent;
+} BAENGINE_APPLY_ARGS;
+typedef struct _BAENGINE_APPLY_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_APPLY_RESULTS;
+typedef struct _BAENGINE_CLOSESPLASHSCREEN_ARGS
+{
+    DWORD cbSize;
+} BAENGINE_CLOSESPLASHSCREEN_ARGS;
+typedef struct _BAENGINE_CLOSESPLASHSCREEN_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_CLOSESPLASHSCREEN_RESULTS;
+typedef struct _BAENGINE_COMPAREVERSIONS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVersion1;
+    LPCWSTR wzVersion2;
+} BAENGINE_COMPAREVERSIONS_ARGS;
+typedef struct _BAENGINE_COMPAREVERSIONS_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+} BAENGINE_COMPAREVERSIONS_RESULTS;
+typedef struct _BAENGINE_DETECT_ARGS
+{
+    DWORD cbSize;
+    HWND hwndParent;
+} BAENGINE_DETECT_ARGS;
+typedef struct _BAENGINE_DETECT_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_DETECT_RESULTS;
+typedef struct _BAENGINE_ELEVATE_ARGS
+{
+    DWORD cbSize;
+    HWND hwndParent;
+} BAENGINE_ELEVATE_ARGS;
+typedef struct _BAENGINE_ELEVATE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_ELEVATE_RESULTS;
+typedef struct _BAENGINE_ESCAPESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzIn;
+} BAENGINE_ESCAPESTRING_ARGS;
+typedef struct _BAENGINE_ESCAPESTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzOut;
+    // Should be initialized to the size of wzOut.
+    SIZE_T cchOut;
+} BAENGINE_ESCAPESTRING_RESULTS;
+typedef struct _BAENGINE_EVALUATECONDITION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzCondition;
+} BAENGINE_EVALUATECONDITION_ARGS;
+typedef struct _BAENGINE_EVALUATECONDITION_RESULTS
+{
+    DWORD cbSize;
+    BOOL f;
+} BAENGINE_EVALUATECONDITION_RESULTS;
+typedef struct _BAENGINE_FORMATSTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzIn;
+} BAENGINE_FORMATSTRING_ARGS;
+typedef struct _BAENGINE_FORMATSTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzOut;
+    // Should be initialized to the size of wzOut.
+    SIZE_T cchOut;
+} BAENGINE_FORMATSTRING_RESULTS;
+typedef struct _BAENGINE_GETPACKAGECOUNT_ARGS
+{
+    DWORD cbSize;
+} BAENGINE_GETPACKAGECOUNT_ARGS;
+typedef struct _BAENGINE_GETPACKAGECOUNT_RESULTS
+{
+    DWORD cbSize;
+    DWORD cPackages;
+} BAENGINE_GETPACKAGECOUNT_RESULTS;
+typedef struct _BAENGINE_GETVARIABLENUMERIC_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BAENGINE_GETVARIABLENUMERIC_ARGS;
+typedef struct _BAENGINE_GETVARIABLENUMERIC_RESULTS
+{
+    DWORD cbSize;
+    LONGLONG llValue;
+} BAENGINE_GETVARIABLENUMERIC_RESULTS;
+typedef struct _BAENGINE_GETVARIABLESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BAENGINE_GETVARIABLESTRING_ARGS;
+typedef struct _BAENGINE_GETVARIABLESTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzValue;
+    // Should be initialized to the size of wzValue.
+    SIZE_T cchValue;
+} BAENGINE_GETVARIABLESTRING_RESULTS;
+typedef struct _BAENGINE_GETVARIABLEVERSION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BAENGINE_GETVARIABLEVERSION_ARGS;
+typedef struct _BAENGINE_GETVARIABLEVERSION_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzValue;
+    // Should be initialized to the size of wzValue.
+    SIZE_T cchValue;
+} BAENGINE_GETVARIABLEVERSION_RESULTS;
+typedef struct _BAENGINE_LAUNCHAPPROVEDEXE_ARGS
+{
+    DWORD cbSize;
+    HWND hwndParent;
+    LPCWSTR wzApprovedExeForElevationId;
+    LPCWSTR wzArguments;
+    DWORD dwWaitForInputIdleTimeout;
+} BAENGINE_LAUNCHAPPROVEDEXE_ARGS;
+typedef struct _BAENGINE_LAUNCHAPPROVEDEXE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_LAUNCHAPPROVEDEXE_RESULTS;
+typedef struct _BAENGINE_SETUPDATESOURCE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzUrl;
+} BAENGINE_SETUPDATESOURCE_ARGS;
+typedef struct _BAENGINE_SETUPDATESOURCE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETUPDATESOURCE_RESULTS;
+typedef struct _BAENGINE_LOG_ARGS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_LOG_LEVEL level;
+    LPCWSTR wzMessage;
+} BAENGINE_LOG_ARGS;
+typedef struct _BAENGINE_LOG_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_LOG_RESULTS;
+typedef struct _BAENGINE_PLAN_ARGS
+{
+    DWORD cbSize;
+    BOOTSTRAPPER_ACTION action;
+} BAENGINE_PLAN_ARGS;
+typedef struct _BAENGINE_PLAN_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_PLAN_RESULTS;
+typedef struct _BAENGINE_QUIT_ARGS
+{
+    DWORD cbSize;
+    DWORD dwExitCode;
+} BAENGINE_QUIT_ARGS;
+typedef struct _BAENGINE_QUIT_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_QUIT_RESULTS;
+typedef struct _BAENGINE_SENDEMBEDDEDERROR_ARGS
+{
+    DWORD cbSize;
+    DWORD dwErrorCode;
+    LPCWSTR wzMessage;
+    DWORD dwUIHint;
+} BAENGINE_SENDEMBEDDEDERROR_ARGS;
+typedef struct _BAENGINE_SENDEMBEDDEDERROR_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+} BAENGINE_SENDEMBEDDEDERROR_RESULTS;
+typedef struct _BAENGINE_SENDEMBEDDEDPROGRESS_ARGS
+{
+    DWORD cbSize;
+    DWORD dwProgressPercentage;
+    DWORD dwOverallProgressPercentage;
+} BAENGINE_SENDEMBEDDEDPROGRESS_ARGS;
+typedef struct _BAENGINE_SENDEMBEDDEDPROGRESS_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+} BAENGINE_SENDEMBEDDEDPROGRESS_RESULTS;
+typedef struct _BAENGINE_SETDOWNLOADSOURCE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    LPCWSTR wzUrl;
+    LPCWSTR wzUser;
+    LPCWSTR wzPassword;
+} BAENGINE_SETDOWNLOADSOURCE_ARGS;
+typedef struct _BAENGINE_SETDOWNLOADSOURCE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETDOWNLOADSOURCE_RESULTS;
+typedef struct _BAENGINE_SETLOCALSOURCE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzPackageOrContainerId;
+    LPCWSTR wzPayloadId;
+    LPCWSTR wzPath;
+} BAENGINE_SETLOCALSOURCE_ARGS;
+typedef struct _BAENGINE_SETLOCALSOURCE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETLOCALSOURCE_RESULTS;
+typedef struct _BAENGINE_SETUPDATE_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzLocalSource;
+    LPCWSTR wzDownloadSource;
+    DWORD64 qwSize;
+    BOOTSTRAPPER_UPDATE_HASH_TYPE hashType;
+    BYTE* rgbHash;
+    DWORD cbHash;
+} BAENGINE_SETUPDATE_ARGS;
+typedef struct _BAENGINE_SETUPDATE_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETUPDATE_RESULTS;
+typedef struct _BAENGINE_SETVARIABLENUMERIC_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LONGLONG llValue;
+} BAENGINE_SETVARIABLENUMERIC_ARGS;
+typedef struct _BAENGINE_SETVARIABLENUMERIC_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETVARIABLENUMERIC_RESULTS;
+typedef struct _BAENGINE_SETVARIABLESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LPCWSTR wzValue;
+    BOOL fFormatted;
+} BAENGINE_SETVARIABLESTRING_ARGS;
+typedef struct _BAENGINE_SETVARIABLESTRING_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETVARIABLESTRING_RESULTS;
+typedef struct _BAENGINE_SETVARIABLEVERSION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LPCWSTR wzValue;
+} BAENGINE_SETVARIABLEVERSION_ARGS;
+typedef struct _BAENGINE_SETVARIABLEVERSION_RESULTS
+{
+    DWORD cbSize;
+} BAENGINE_SETVARIABLEVERSION_RESULTS;
+extern "C" typedef HRESULT(WINAPI *PFN_BOOTSTRAPPER_ENGINE_PROC)(
+    __in BOOTSTRAPPER_ENGINE_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    );
+#if defined(__cplusplus)
+}
+#endif
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtension.h b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtension.h
new file mode 100644
index 00000000..be76a1a5
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtension.h
@@ -0,0 +1,60 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#if defined(__cplusplus)
+extern "C" {
+#endif
+enum BUNDLE_EXTENSION_MESSAGE
+{
+    BUNDLE_EXTENSION_MESSAGE_SEARCH,
+};
+typedef struct _BUNDLE_EXTENSION_SEARCH_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzId;
+    LPCWSTR wzVariable;
+} BUNDLE_EXTENSION_SEARCH_ARGS;
+typedef struct _BUNDLE_EXTENSION_SEARCH_RESULTS
+{
+    DWORD cbSize;
+} BUNDLE_EXTENSION_SEARCH_RESULTS;
+extern "C" typedef HRESULT(WINAPI *PFN_BUNDLE_EXTENSION_PROC)(
+    __in BUNDLE_EXTENSION_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    );
+typedef struct _BUNDLE_EXTENSION_CREATE_ARGS
+{
+    DWORD cbSize;
+    DWORD64 qwEngineAPIVersion;
+    PFN_BUNDLE_EXTENSION_ENGINE_PROC pfnBundleExtensionEngineProc;
+    LPVOID pvBundleExtensionEngineProcContext;
+    LPCWSTR wzBootstrapperWorkingFolder;
+    LPCWSTR wzBundleExtensionDataPath;
+    LPCWSTR wzExtensionId;
+} BUNDLE_EXTENSION_CREATE_ARGS;
+typedef struct _BUNDLE_EXTENSION_CREATE_RESULTS
+{
+    DWORD cbSize;
+    PFN_BUNDLE_EXTENSION_PROC pfnBundleExtensionProc;
+    LPVOID pvBundleExtensionProcContext;
+} BUNDLE_EXTENSION_CREATE_RESULTS;
+extern "C" typedef HRESULT(WINAPI *PFN_BUNDLE_EXTENSION_CREATE)(
+    __in const BUNDLE_EXTENSION_CREATE_ARGS* pArgs,
+    __inout BUNDLE_EXTENSION_CREATE_RESULTS* pResults
+    );
+extern "C" typedef void (WINAPI *PFN_BUNDLE_EXTENSION_DESTROY)();
+#if defined(__cplusplus)
+}
+#endif
diff --git a/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtensionEngine.h b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtensionEngine.h
new file mode 100644
index 00000000..b397ec16
--- /dev/null
+++ b/src/api/burn/WixToolset.BootstrapperCore.Native/inc/BundleExtensionEngine.h
@@ -0,0 +1,184 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#if defined(__cplusplus)
+extern "C" {
+#endif
+enum BUNDLE_EXTENSION_LOG_LEVEL
+{
+    BUNDLE_EXTENSION_LOG_LEVEL_NONE,      // turns off report (only valid for XXXSetLevel())
+    BUNDLE_EXTENSION_LOG_LEVEL_STANDARD,  // written if reporting is on
+    BUNDLE_EXTENSION_LOG_LEVEL_VERBOSE,   // written only if verbose reporting is on
+    BUNDLE_EXTENSION_LOG_LEVEL_DEBUG,     // reporting useful when debugging code
+    BUNDLE_EXTENSION_LOG_LEVEL_ERROR,     // always gets reported, but can never be specified
+};
+enum BUNDLE_EXTENSION_ENGINE_MESSAGE
+{
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_ESCAPESTRING,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_EVALUATECONDITION,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_FORMATSTRING,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLENUMERIC,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLESTRING,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLEVERSION,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_LOG,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLENUMERIC,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLESTRING,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLEVERSION,
+    BUNDLE_EXTENSION_ENGINE_MESSAGE_COMPAREVERSIONS,
+};
+typedef struct _BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVersion1;
+    LPCWSTR wzVersion2;
+} BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_RESULTS
+{
+    DWORD cbSize;
+    int nResult;
+} BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzIn;
+} BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzOut;
+    // Should be initialized to the size of wzOut.
+    SIZE_T cchOut;
+} BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzCondition;
+} BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_RESULTS
+{
+    DWORD cbSize;
+    BOOL f;
+} BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_FORMATSTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzIn;
+} BUNDLE_EXTENSION_ENGINE_FORMATSTRING_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_FORMATSTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzOut;
+    // Should be initialized to the size of wzOut.
+    SIZE_T cchOut;
+} BUNDLE_EXTENSION_ENGINE_FORMATSTRING_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_RESULTS
+{
+    DWORD cbSize;
+    LONGLONG llValue;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzValue;
+    // Should be initialized to the size of wzValue.
+    SIZE_T cchValue;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_RESULTS
+{
+    DWORD cbSize;
+    LPWSTR wzValue;
+    // Should be initialized to the size of wzValue.
+    SIZE_T cchValue;
+} BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_LOG_ARGS
+{
+    DWORD cbSize;
+    BUNDLE_EXTENSION_LOG_LEVEL level;
+    LPCWSTR wzMessage;
+} BUNDLE_EXTENSION_ENGINE_LOG_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_LOG_RESULTS
+{
+    DWORD cbSize;
+} BUNDLE_EXTENSION_ENGINE_LOG_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LONGLONG llValue;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_RESULTS
+{
+    DWORD cbSize;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LPCWSTR wzValue;
+    BOOL fFormatted;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_RESULTS
+{
+    DWORD cbSize;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_RESULTS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_ARGS
+{
+    DWORD cbSize;
+    LPCWSTR wzVariable;
+    LPCWSTR wzValue;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_ARGS;
+typedef struct _BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_RESULTS
+{
+    DWORD cbSize;
+} BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_RESULTS;
+extern "C" typedef HRESULT(WINAPI *PFN_BUNDLE_EXTENSION_ENGINE_PROC)(
+    __in BUNDLE_EXTENSION_ENGINE_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    );
+#if defined(__cplusplus)
+}
+#endif
diff --git a/src/api/burn/WixToolset.Mba.Core/BalUtil.cs b/src/api/burn/WixToolset.Mba.Core/BalUtil.cs
new file mode 100644
index 00000000..f478eca4
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BalUtil.cs
@@ -0,0 +1,22 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    internal static class BalUtil
+    {
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern IBootstrapperEngine InitializeFromCreateArgs(
+            IntPtr pArgs,
+            ref Command pCommand
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true)]
+        internal static extern void StoreBAInCreateResults(
+            IntPtr pResults,
+            [MarshalAs(UnmanagedType.Interface)] IBootstrapperApplication pBA
+            );
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BaseBootstrapperApplicationFactory.cs b/src/api/burn/WixToolset.Mba.Core/BaseBootstrapperApplicationFactory.cs
new file mode 100644
index 00000000..ad8a5dc0
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BaseBootstrapperApplicationFactory.cs
@@ -0,0 +1,63 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// Default implementation of <see cref="IBootstrapperApplicationFactory"/>.
+    /// </summary>
+    public abstract class BaseBootstrapperApplicationFactory : IBootstrapperApplicationFactory
+    {
+        /// <summary>
+        /// Default implementation of <see cref="IBootstrapperApplicationFactory.Create(IntPtr, IntPtr)"/>
+        /// </summary>
+        /// <param name="pArgs"></param>
+        /// <param name="pResults"></param>
+        public void Create(IntPtr pArgs, IntPtr pResults)
+        {
+            InitializeFromCreateArgs(pArgs, out var engine, out var bootstrapperCommand);
+            var ba = this.Create(engine, bootstrapperCommand);
+            StoreBAInCreateResults(pResults, ba);
+        }
+        /// <summary>
+        /// Called by <see cref="BaseBootstrapperApplicationFactory.Create(IntPtr, IntPtr)"/> to get the <see cref="IBootstrapperApplication"/>.
+        /// </summary>
+        /// <param name="engine">The bundle engine.</param>
+        /// <param name="bootstrapperCommand">Command information passed from the engine for the BA to perform.</param>
+        /// <returns>The <see cref="IBootstrapperApplication"/> for the bundle.</returns>
+        protected abstract IBootstrapperApplication Create(IEngine engine, IBootstrapperCommand bootstrapperCommand);
+        /// <summary>
+        /// Initializes the native part of <see cref="WixToolset.Mba.Core"/>.
+        /// Most users should inherit from <see cref="BaseBootstrapperApplicationFactory"/> instead of calling this method.
+        /// </summary>
+        /// <param name="pArgs">The args struct given by the engine when initially creating the BA.</param>
+        /// <param name="engine">The bundle engine interface.</param>
+        /// <param name="bootstrapperCommand">The context of the current run of the bundle.</param>
+        public static void InitializeFromCreateArgs(IntPtr pArgs, out IEngine engine, out IBootstrapperCommand bootstrapperCommand)
+        {
+            Command pCommand = new Command
+            {
+                cbSize = Marshal.SizeOf(typeof(Command))
+            };
+            var pEngine = BalUtil.InitializeFromCreateArgs(pArgs, ref pCommand);
+            engine = new Engine(pEngine);
+            bootstrapperCommand = pCommand.GetBootstrapperCommand();
+        }
+        /// <summary>
+        /// Registers the BA with the engine using the default mapping between the message based interface and the COM interface.
+        /// Most users should inherit from <see cref="BaseBootstrapperApplicationFactory"/> instead of calling this method.
+        /// </summary>
+        /// <param name="pResults">The results struct given by the engine when initially creating the BA</param>
+        /// <param name="ba">The <see cref="IBootstrapperApplication"/>.</param>
+        public static void StoreBAInCreateResults(IntPtr pResults, IBootstrapperApplication ba)
+        {
+            BalUtil.StoreBAInCreateResults(pResults, ba);
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs
new file mode 100644
index 00000000..072d3ef0
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplication.cs
@@ -0,0 +1,1873 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    using System.Threading;
+    /// <summary>
+    /// The default bootstrapper application.
+    /// </summary>
+    [ClassInterface(ClassInterfaceType.None)]
+    public abstract class BootstrapperApplication : MarshalByRefObject, IDefaultBootstrapperApplication
+    {
+        /// <summary>
+        /// Specifies whether this bootstrapper should run asynchronously. The default is true.
+        /// </summary>
+        protected readonly bool asyncExecution;
+        /// <summary>
+        /// Gets the <see cref="IEngine"/> for interaction with the engine.
+        /// </summary>
+        protected readonly IEngine engine;
+        private bool applying;
+        /// <summary>
+        /// Creates a new instance of the <see cref="BootstrapperApplication"/> class.
+        /// </summary>
+        protected BootstrapperApplication(IEngine engine)
+        {
+            this.engine = engine;
+            this.applying = false;
+            this.asyncExecution = true;
+        }
+        /// <inheritdoc/>
+        public event EventHandler<StartupEventArgs> Startup;
+        /// <inheritdoc/>
+        public event EventHandler<ShutdownEventArgs> Shutdown;
+        /// <inheritdoc/>
+        public event EventHandler<SystemShutdownEventArgs> SystemShutdown;
+        /// <inheritdoc/>
+        public event EventHandler<DetectBeginEventArgs> DetectBegin;
+        /// <inheritdoc/>
+        public event EventHandler<DetectForwardCompatibleBundleEventArgs> DetectForwardCompatibleBundle;
+        /// <inheritdoc/>
+        public event EventHandler<DetectUpdateBeginEventArgs> DetectUpdateBegin;
+        /// <inheritdoc/>
+        public event EventHandler<DetectUpdateEventArgs> DetectUpdate;
+        /// <inheritdoc/>
+        public event EventHandler<DetectUpdateCompleteEventArgs> DetectUpdateComplete;
+        /// <inheritdoc/>
+        public event EventHandler<DetectRelatedBundleEventArgs> DetectRelatedBundle;
+        /// <inheritdoc/>
+        public event EventHandler<DetectPackageBeginEventArgs> DetectPackageBegin;
+        
+        /// <inheritdoc/>
+        public event EventHandler<DetectRelatedMsiPackageEventArgs> DetectRelatedMsiPackage;
+        /// <inheritdoc/>
+        public event EventHandler<DetectPatchTargetEventArgs> DetectPatchTarget;
+        /// <inheritdoc/>
+        public event EventHandler<DetectMsiFeatureEventArgs> DetectMsiFeature;
+        /// <inheritdoc/>
+        public event EventHandler<DetectPackageCompleteEventArgs> DetectPackageComplete;
+        /// <inheritdoc/>
+        public event EventHandler<DetectCompleteEventArgs> DetectComplete;
+        /// <inheritdoc/>
+        public event EventHandler<PlanBeginEventArgs> PlanBegin;
+        /// <inheritdoc/>
+        public event EventHandler<PlanRelatedBundleEventArgs> PlanRelatedBundle;
+        /// <inheritdoc/>
+        public event EventHandler<PlanPackageBeginEventArgs> PlanPackageBegin;
+        /// <inheritdoc/>
+        public event EventHandler<PlanPatchTargetEventArgs> PlanPatchTarget;
+        /// <inheritdoc/>
+        public event EventHandler<PlanMsiFeatureEventArgs> PlanMsiFeature;
+        /// <inheritdoc/>
+        public event EventHandler<PlanMsiPackageEventArgs> PlanMsiPackage;
+        /// <inheritdoc/>
+        public event EventHandler<PlanPackageCompleteEventArgs> PlanPackageComplete;
+        /// <inheritdoc/>
+        public event EventHandler<PlannedPackageEventArgs> PlannedPackage;
+        /// <inheritdoc/>
+        public event EventHandler<PlanCompleteEventArgs> PlanComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ApplyBeginEventArgs> ApplyBegin;
+        /// <inheritdoc/>
+        public event EventHandler<ElevateBeginEventArgs> ElevateBegin;
+        /// <inheritdoc/>
+        public event EventHandler<ElevateCompleteEventArgs> ElevateComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ProgressEventArgs> Progress;
+        /// <inheritdoc/>
+        public event EventHandler<ErrorEventArgs> Error;
+        /// <inheritdoc/>
+        public event EventHandler<RegisterBeginEventArgs> RegisterBegin;
+        /// <inheritdoc/>
+        public event EventHandler<RegisterCompleteEventArgs> RegisterComplete;
+        /// <inheritdoc/>
+        public event EventHandler<UnregisterBeginEventArgs> UnregisterBegin;
+        /// <inheritdoc/>
+        public event EventHandler<UnregisterCompleteEventArgs> UnregisterComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CacheBeginEventArgs> CacheBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CachePackageBeginEventArgs> CachePackageBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CacheAcquireBeginEventArgs> CacheAcquireBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CacheAcquireProgressEventArgs> CacheAcquireProgress;
+        /// <inheritdoc/>
+        public event EventHandler<CacheAcquireResolvingEventArgs> CacheAcquireResolving;
+        /// <inheritdoc/>
+        public event EventHandler<CacheAcquireCompleteEventArgs> CacheAcquireComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CacheVerifyBeginEventArgs> CacheVerifyBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CacheVerifyProgressEventArgs> CacheVerifyProgress;
+        /// <inheritdoc/>
+        public event EventHandler<CacheVerifyCompleteEventArgs> CacheVerifyComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CachePackageCompleteEventArgs> CachePackageComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CacheCompleteEventArgs> CacheComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ExecuteBeginEventArgs> ExecuteBegin;
+        /// <inheritdoc/>
+        public event EventHandler<ExecutePackageBeginEventArgs> ExecutePackageBegin;
+        /// <inheritdoc/>
+        public event EventHandler<ExecutePatchTargetEventArgs> ExecutePatchTarget;
+        /// <inheritdoc/>
+        public event EventHandler<ExecuteMsiMessageEventArgs> ExecuteMsiMessage;
+        /// <inheritdoc/>
+        public event EventHandler<ExecuteFilesInUseEventArgs> ExecuteFilesInUse;
+        /// <inheritdoc/>
+        public event EventHandler<ExecutePackageCompleteEventArgs> ExecutePackageComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ExecuteCompleteEventArgs> ExecuteComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ApplyCompleteEventArgs> ApplyComplete;
+        /// <inheritdoc/>
+        public event EventHandler<ExecuteProgressEventArgs> ExecuteProgress;
+        /// <inheritdoc/>
+        public event EventHandler<LaunchApprovedExeBeginEventArgs> LaunchApprovedExeBegin;
+        /// <inheritdoc/>
+        public event EventHandler<LaunchApprovedExeCompleteEventArgs> LaunchApprovedExeComplete;
+        /// <inheritdoc/>
+        public event EventHandler<BeginMsiTransactionBeginEventArgs> BeginMsiTransactionBegin;
+        /// <inheritdoc/>
+        public event EventHandler<BeginMsiTransactionCompleteEventArgs> BeginMsiTransactionComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CommitMsiTransactionBeginEventArgs> CommitMsiTransactionBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CommitMsiTransactionCompleteEventArgs> CommitMsiTransactionComplete;
+        /// <inheritdoc/>
+        public event EventHandler<RollbackMsiTransactionBeginEventArgs> RollbackMsiTransactionBegin;
+        /// <inheritdoc/>
+        public event EventHandler<RollbackMsiTransactionCompleteEventArgs> RollbackMsiTransactionComplete;
+        /// <inheritdoc/>
+        public event EventHandler<PauseAutomaticUpdatesBeginEventArgs> PauseAutomaticUpdatesBegin;
+        /// <inheritdoc/>
+        public event EventHandler<PauseAutomaticUpdatesCompleteEventArgs> PauseAutomaticUpdatesComplete;
+        /// <inheritdoc/>
+        public event EventHandler<SystemRestorePointBeginEventArgs> SystemRestorePointBegin;
+        /// <inheritdoc/>
+        public event EventHandler<SystemRestorePointCompleteEventArgs> SystemRestorePointComplete;
+        /// <inheritdoc/>
+        public event EventHandler<PlanForwardCompatibleBundleEventArgs> PlanForwardCompatibleBundle;
+        /// <inheritdoc/>
+        public event EventHandler<CacheContainerOrPayloadVerifyBeginEventArgs> CacheContainerOrPayloadVerifyBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CacheContainerOrPayloadVerifyProgressEventArgs> CacheContainerOrPayloadVerifyProgress;
+        /// <inheritdoc/>
+        public event EventHandler<CacheContainerOrPayloadVerifyCompleteEventArgs> CacheContainerOrPayloadVerifyComplete;
+        /// <inheritdoc/>
+        public event EventHandler<CachePayloadExtractBeginEventArgs> CachePayloadExtractBegin;
+        /// <inheritdoc/>
+        public event EventHandler<CachePayloadExtractProgressEventArgs> CachePayloadExtractProgress;
+        /// <inheritdoc/>
+        public event EventHandler<CachePayloadExtractCompleteEventArgs> CachePayloadExtractComplete;
+        /// <summary>
+        /// Entry point that is called when the bootstrapper application is ready to run.
+        /// </summary>
+        protected abstract void Run();
+        /// <summary>
+        /// Called by the engine, raises the <see cref="Startup"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnStartup(StartupEventArgs args)
+        {
+            EventHandler<StartupEventArgs> handler = this.Startup;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+            if (this.asyncExecution)
+            {
+                this.engine.Log(LogLevel.Verbose, "Creating BA thread to run asynchronously.");
+                Thread uiThread = new Thread(this.Run);
+                uiThread.Name = "UIThread";
+                uiThread.SetApartmentState(ApartmentState.STA);
+                uiThread.Start();
+            }
+            else
+            {
+                this.engine.Log(LogLevel.Verbose, "Creating BA thread to run synchronously.");
+                this.Run();
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="Shutdown"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnShutdown(ShutdownEventArgs args)
+        {
+            EventHandler<ShutdownEventArgs> handler = this.Shutdown;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="SystemShutdown"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnSystemShutdown(SystemShutdownEventArgs args)
+        {
+            EventHandler<SystemShutdownEventArgs> handler = this.SystemShutdown;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+            else if (null != args)
+            {
+                // Allow requests to shut down when critical or not applying.
+                bool critical = EndSessionReasons.Critical == (EndSessionReasons.Critical & args.Reasons);
+                args.Cancel = !critical && this.applying;
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectBegin(DetectBeginEventArgs args)
+        {
+            EventHandler<DetectBeginEventArgs> handler = this.DetectBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectForwardCompatibleBundle"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectForwardCompatibleBundle(DetectForwardCompatibleBundleEventArgs args)
+        {
+            EventHandler<DetectForwardCompatibleBundleEventArgs> handler = this.DetectForwardCompatibleBundle;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectUpdateBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectUpdateBegin(DetectUpdateBeginEventArgs args)
+        {
+            EventHandler<DetectUpdateBeginEventArgs> handler = this.DetectUpdateBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectUpdate"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectUpdate(DetectUpdateEventArgs args)
+        {
+            EventHandler<DetectUpdateEventArgs> handler = this.DetectUpdate;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectUpdateComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectUpdateComplete(DetectUpdateCompleteEventArgs args)
+        {
+            EventHandler<DetectUpdateCompleteEventArgs> handler = this.DetectUpdateComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectRelatedBundle"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectRelatedBundle(DetectRelatedBundleEventArgs args)
+        {
+            EventHandler<DetectRelatedBundleEventArgs> handler = this.DetectRelatedBundle;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectPackageBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectPackageBegin(DetectPackageBeginEventArgs args)
+        {
+            EventHandler<DetectPackageBeginEventArgs> handler = this.DetectPackageBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectRelatedMsiPackage"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectRelatedMsiPackage(DetectRelatedMsiPackageEventArgs args)
+        {
+            EventHandler<DetectRelatedMsiPackageEventArgs> handler = this.DetectRelatedMsiPackage;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectPatchTarget"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectPatchTarget(DetectPatchTargetEventArgs args)
+        {
+            EventHandler<DetectPatchTargetEventArgs> handler = this.DetectPatchTarget;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectMsiFeature"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectMsiFeature(DetectMsiFeatureEventArgs args)
+        {
+            EventHandler<DetectMsiFeatureEventArgs> handler = this.DetectMsiFeature;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectPackageComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectPackageComplete(DetectPackageCompleteEventArgs args)
+        {
+            EventHandler<DetectPackageCompleteEventArgs> handler = this.DetectPackageComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="DetectComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnDetectComplete(DetectCompleteEventArgs args)
+        {
+            EventHandler<DetectCompleteEventArgs> handler = this.DetectComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanBegin(PlanBeginEventArgs args)
+        {
+            EventHandler<PlanBeginEventArgs> handler = this.PlanBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanRelatedBundle"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanRelatedBundle(PlanRelatedBundleEventArgs args)
+        {
+            EventHandler<PlanRelatedBundleEventArgs> handler = this.PlanRelatedBundle;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanPackageBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanPackageBegin(PlanPackageBeginEventArgs args)
+        {
+            EventHandler<PlanPackageBeginEventArgs> handler = this.PlanPackageBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanPatchTarget"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanPatchTarget(PlanPatchTargetEventArgs args)
+        {
+            EventHandler<PlanPatchTargetEventArgs> handler = this.PlanPatchTarget;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanMsiFeature"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanMsiFeature(PlanMsiFeatureEventArgs args)
+        {
+            EventHandler<PlanMsiFeatureEventArgs> handler = this.PlanMsiFeature;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanMsiPackage"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanMsiPackage(PlanMsiPackageEventArgs args)
+        {
+            EventHandler<PlanMsiPackageEventArgs> handler = this.PlanMsiPackage;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanPackageComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanPackageComplete(PlanPackageCompleteEventArgs args)
+        {
+            EventHandler<PlanPackageCompleteEventArgs> handler = this.PlanPackageComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlannedPackage"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlannedPackage(PlannedPackageEventArgs args)
+        {
+            EventHandler<PlannedPackageEventArgs> handler = this.PlannedPackage;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPlanComplete(PlanCompleteEventArgs args)
+        {
+            EventHandler<PlanCompleteEventArgs> handler = this.PlanComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ApplyBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnApplyBegin(ApplyBeginEventArgs args)
+        {
+            EventHandler<ApplyBeginEventArgs> handler = this.ApplyBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ElevateBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnElevateBegin(ElevateBeginEventArgs args)
+        {
+            EventHandler<ElevateBeginEventArgs> handler = this.ElevateBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ElevateComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnElevateComplete(ElevateCompleteEventArgs args)
+        {
+            EventHandler<ElevateCompleteEventArgs> handler = this.ElevateComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="Progress"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnProgress(ProgressEventArgs args)
+        {
+            EventHandler<ProgressEventArgs> handler = this.Progress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="Error"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnError(ErrorEventArgs args)
+        {
+            EventHandler<ErrorEventArgs> handler = this.Error;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="RegisterBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnRegisterBegin(RegisterBeginEventArgs args)
+        {
+            EventHandler<RegisterBeginEventArgs> handler = this.RegisterBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="RegisterComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnRegisterComplete(RegisterCompleteEventArgs args)
+        {
+            EventHandler<RegisterCompleteEventArgs> handler = this.RegisterComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="UnregisterBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnUnregisterBegin(UnregisterBeginEventArgs args)
+        {
+            EventHandler<UnregisterBeginEventArgs> handler = this.UnregisterBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="UnregisterComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnUnregisterComplete(UnregisterCompleteEventArgs args)
+        {
+            EventHandler<UnregisterCompleteEventArgs> handler = this.UnregisterComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheBegin(CacheBeginEventArgs args)
+        {
+            EventHandler<CacheBeginEventArgs> handler = this.CacheBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CachePackageBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCachePackageBegin(CachePackageBeginEventArgs args)
+        {
+            EventHandler<CachePackageBeginEventArgs> handler = this.CachePackageBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheAcquireBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheAcquireBegin(CacheAcquireBeginEventArgs args)
+        {
+            EventHandler<CacheAcquireBeginEventArgs> handler = this.CacheAcquireBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheAcquireProgress"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheAcquireProgress(CacheAcquireProgressEventArgs args)
+        {
+            EventHandler<CacheAcquireProgressEventArgs> handler = this.CacheAcquireProgress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheAcquireResolving"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnCacheAcquireResolving(CacheAcquireResolvingEventArgs args)
+        {
+            EventHandler<CacheAcquireResolvingEventArgs> handler = this.CacheAcquireResolving;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheAcquireComplete"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheAcquireComplete(CacheAcquireCompleteEventArgs args)
+        {
+            EventHandler<CacheAcquireCompleteEventArgs> handler = this.CacheAcquireComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheVerifyBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheVerifyBegin(CacheVerifyBeginEventArgs args)
+        {
+            EventHandler<CacheVerifyBeginEventArgs> handler = this.CacheVerifyBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheVerifyProgress"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheVerifyProgress(CacheVerifyProgressEventArgs args)
+        {
+            EventHandler<CacheVerifyProgressEventArgs> handler = this.CacheVerifyProgress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheVerifyComplete"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheVerifyComplete(CacheVerifyCompleteEventArgs args)
+        {
+            EventHandler<CacheVerifyCompleteEventArgs> handler = this.CacheVerifyComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CachePackageComplete"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCachePackageComplete(CachePackageCompleteEventArgs args)
+        {
+            EventHandler<CachePackageCompleteEventArgs> handler = this.CachePackageComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnCacheComplete(CacheCompleteEventArgs args)
+        {
+            EventHandler<CacheCompleteEventArgs> handler = this.CacheComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecuteBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecuteBegin(ExecuteBeginEventArgs args)
+        {
+            EventHandler<ExecuteBeginEventArgs> handler = this.ExecuteBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecutePackageBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecutePackageBegin(ExecutePackageBeginEventArgs args)
+        {
+            EventHandler<ExecutePackageBeginEventArgs> handler = this.ExecutePackageBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecutePatchTarget"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecutePatchTarget(ExecutePatchTargetEventArgs args)
+        {
+            EventHandler<ExecutePatchTargetEventArgs> handler = this.ExecutePatchTarget;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecuteMsiMessage"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecuteMsiMessage(ExecuteMsiMessageEventArgs args)
+        {
+            EventHandler<ExecuteMsiMessageEventArgs> handler = this.ExecuteMsiMessage;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecuteFilesInUse"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecuteFilesInUse(ExecuteFilesInUseEventArgs args)
+        {
+            EventHandler<ExecuteFilesInUseEventArgs> handler = this.ExecuteFilesInUse;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecutePackageComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecutePackageComplete(ExecutePackageCompleteEventArgs args)
+        {
+            EventHandler<ExecutePackageCompleteEventArgs> handler = this.ExecutePackageComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecuteComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecuteComplete(ExecuteCompleteEventArgs args)
+        {
+            EventHandler<ExecuteCompleteEventArgs> handler = this.ExecuteComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ApplyComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnApplyComplete(ApplyCompleteEventArgs args)
+        {
+            EventHandler<ApplyCompleteEventArgs> handler = this.ApplyComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="ExecuteProgress"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnExecuteProgress(ExecuteProgressEventArgs args)
+        {
+            EventHandler<ExecuteProgressEventArgs> handler = this.ExecuteProgress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="LaunchApprovedExeBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnLaunchApprovedExeBegin(LaunchApprovedExeBeginEventArgs args)
+        {
+            EventHandler<LaunchApprovedExeBeginEventArgs> handler = this.LaunchApprovedExeBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="LaunchApprovedExeComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnLaunchApprovedExeComplete(LaunchApprovedExeCompleteEventArgs args)
+        {
+            EventHandler<LaunchApprovedExeCompleteEventArgs> handler = this.LaunchApprovedExeComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="BeginMsiTransactionBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnBeginMsiTransactionBegin(BeginMsiTransactionBeginEventArgs args)
+        {
+            EventHandler<BeginMsiTransactionBeginEventArgs> handler = this.BeginMsiTransactionBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="BeginMsiTransactionComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnBeginMsiTransactionComplete(BeginMsiTransactionCompleteEventArgs args)
+        {
+            EventHandler<BeginMsiTransactionCompleteEventArgs> handler = this.BeginMsiTransactionComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CommitMsiTransactionBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnCommitMsiTransactionBegin(CommitMsiTransactionBeginEventArgs args)
+        {
+            EventHandler<CommitMsiTransactionBeginEventArgs> handler = this.CommitMsiTransactionBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CommitMsiTransactionComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnCommitMsiTransactionComplete(CommitMsiTransactionCompleteEventArgs args)
+        {
+            EventHandler<CommitMsiTransactionCompleteEventArgs> handler = this.CommitMsiTransactionComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="RollbackMsiTransactionBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnRollbackMsiTransactionBegin(RollbackMsiTransactionBeginEventArgs args)
+        {
+            EventHandler<RollbackMsiTransactionBeginEventArgs> handler = this.RollbackMsiTransactionBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="RollbackMsiTransactionComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnRollbackMsiTransactionComplete(RollbackMsiTransactionCompleteEventArgs args)
+        {
+            EventHandler<RollbackMsiTransactionCompleteEventArgs> handler = this.RollbackMsiTransactionComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PauseAutomaticUpdatesBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPauseAutomaticUpdatesBegin(PauseAutomaticUpdatesBeginEventArgs args)
+        {
+            EventHandler<PauseAutomaticUpdatesBeginEventArgs> handler = this.PauseAutomaticUpdatesBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PauseAutomaticUpdatesComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnPauseAutomaticUpdatesComplete(PauseAutomaticUpdatesCompleteEventArgs args)
+        {
+            EventHandler<PauseAutomaticUpdatesCompleteEventArgs> handler = this.PauseAutomaticUpdatesComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="SystemRestorePointBegin"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnSystemRestorePointBegin(SystemRestorePointBeginEventArgs args)
+        {
+            EventHandler<SystemRestorePointBeginEventArgs> handler = this.SystemRestorePointBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="SystemRestorePointComplete"/> event.
+        /// </summary>
+        /// <param name="args">Additional arguments for this event.</param>
+        protected virtual void OnSystemRestorePointComplete(SystemRestorePointCompleteEventArgs args)
+        {
+            EventHandler<SystemRestorePointCompleteEventArgs> handler = this.SystemRestorePointComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="PlanForwardCompatibleBundle"/> event.
+        /// </summary>
+        protected virtual void OnPlanForwardCompatibleBundle(PlanForwardCompatibleBundleEventArgs args)
+        {
+            EventHandler<PlanForwardCompatibleBundleEventArgs> handler = this.PlanForwardCompatibleBundle;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheContainerOrPayloadVerifyBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheContainerOrPayloadVerifyBegin(CacheContainerOrPayloadVerifyBeginEventArgs args)
+        {
+            EventHandler<CacheContainerOrPayloadVerifyBeginEventArgs> handler = this.CacheContainerOrPayloadVerifyBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheContainerOrPayloadVerifyProgress"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheContainerOrPayloadVerifyProgress(CacheContainerOrPayloadVerifyProgressEventArgs args)
+        {
+            EventHandler<CacheContainerOrPayloadVerifyProgressEventArgs> handler = this.CacheContainerOrPayloadVerifyProgress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CacheContainerOrPayloadVerifyComplete"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCacheContainerOrPayloadVerifyComplete(CacheContainerOrPayloadVerifyCompleteEventArgs args)
+        {
+            EventHandler<CacheContainerOrPayloadVerifyCompleteEventArgs> handler = this.CacheContainerOrPayloadVerifyComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CachePayloadExtractBegin"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCachePayloadExtractBegin(CachePayloadExtractBeginEventArgs args)
+        {
+            EventHandler<CachePayloadExtractBeginEventArgs> handler = this.CachePayloadExtractBegin;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CachePayloadExtractProgress"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCachePayloadExtractProgress(CachePayloadExtractProgressEventArgs args)
+        {
+            EventHandler<CachePayloadExtractProgressEventArgs> handler = this.CachePayloadExtractProgress;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        /// <summary>
+        /// Called by the engine, raises the <see cref="CachePayloadExtractComplete"/> event.
+        /// </summary>
+        /// <param name="args"></param>
+        protected virtual void OnCachePayloadExtractComplete(CachePayloadExtractCompleteEventArgs args)
+        {
+            EventHandler<CachePayloadExtractCompleteEventArgs> handler = this.CachePayloadExtractComplete;
+            if (null != handler)
+            {
+                handler(this, args);
+            }
+        }
+        #region IBootstrapperApplication Members
+        int IBootstrapperApplication.BAProc(int message, IntPtr pvArgs, IntPtr pvResults, IntPtr pvContext)
+        {
+            switch (message)
+            {
+                default:
+                    return NativeMethods.E_NOTIMPL;
+            }
+        }
+        void IBootstrapperApplication.BAProcFallback(int message, IntPtr pvArgs, IntPtr pvResults, ref int phr, IntPtr pvContext)
+        {
+        }
+        int IBootstrapperApplication.OnStartup()
+        {
+            StartupEventArgs args = new StartupEventArgs();
+            this.OnStartup(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnShutdown(ref BOOTSTRAPPER_SHUTDOWN_ACTION action)
+        {
+            ShutdownEventArgs args = new ShutdownEventArgs(action);
+            this.OnShutdown(args);
+            action = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnSystemShutdown(EndSessionReasons dwEndSession, ref bool fCancel)
+        {
+            SystemShutdownEventArgs args = new SystemShutdownEventArgs(dwEndSession, fCancel);
+            this.OnSystemShutdown(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectBegin(bool fCached, bool fInstalled, int cPackages, ref bool fCancel)
+        {
+            DetectBeginEventArgs args = new DetectBeginEventArgs(fCached, fInstalled, cPackages, fCancel);
+            this.OnDetectBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectForwardCompatibleBundle(string wzBundleId, RelationType relationType, string wzBundleTag, bool fPerMachine, string wzVersion, bool fMissingFromCache, ref bool fCancel)
+        {
+            DetectForwardCompatibleBundleEventArgs args = new DetectForwardCompatibleBundleEventArgs(wzBundleId, relationType, wzBundleTag, fPerMachine, wzVersion, fMissingFromCache, fCancel);
+            this.OnDetectForwardCompatibleBundle(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectUpdateBegin(string wzUpdateLocation, ref bool fCancel, ref bool fSkip)
+        {
+            DetectUpdateBeginEventArgs args = new DetectUpdateBeginEventArgs(wzUpdateLocation, fCancel, fSkip);
+            this.OnDetectUpdateBegin(args);
+            fCancel = args.Cancel;
+            fSkip = args.Skip;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectUpdate(string wzUpdateLocation, long dw64Size, string wzVersion, string wzTitle, string wzSummary, string wzContentType, string wzContent, ref bool fCancel, ref bool fStopProcessingUpdates)
+        {
+            DetectUpdateEventArgs args = new DetectUpdateEventArgs(wzUpdateLocation, dw64Size, wzVersion, wzTitle, wzSummary, wzContentType, wzContent, fCancel, fStopProcessingUpdates);
+            this.OnDetectUpdate(args);
+            fCancel = args.Cancel;
+            fStopProcessingUpdates = args.StopProcessingUpdates;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectUpdateComplete(int hrStatus, ref bool fIgnoreError)
+        {
+            DetectUpdateCompleteEventArgs args = new DetectUpdateCompleteEventArgs(hrStatus, fIgnoreError);
+            this.OnDetectUpdateComplete(args);
+            fIgnoreError = args.IgnoreError;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectRelatedBundle(string wzProductCode, RelationType relationType, string wzBundleTag, bool fPerMachine, string wzVersion, RelatedOperation operation, bool fMissingFromCache, ref bool fCancel)
+        {
+            DetectRelatedBundleEventArgs args = new DetectRelatedBundleEventArgs(wzProductCode, relationType, wzBundleTag, fPerMachine, wzVersion, operation, fMissingFromCache, fCancel);
+            this.OnDetectRelatedBundle(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectPackageBegin(string wzPackageId, ref bool fCancel)
+        {
+            DetectPackageBeginEventArgs args = new DetectPackageBeginEventArgs(wzPackageId, fCancel);
+            this.OnDetectPackageBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectRelatedMsiPackage(string wzPackageId, string wzUpgradeCode, string wzProductCode, bool fPerMachine, string wzVersion, RelatedOperation operation, ref bool fCancel)
+        {
+            DetectRelatedMsiPackageEventArgs args = new DetectRelatedMsiPackageEventArgs(wzPackageId, wzUpgradeCode, wzProductCode, fPerMachine, wzVersion, operation, fCancel);
+            this.OnDetectRelatedMsiPackage(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectPatchTarget(string wzPackageId, string wzProductCode, PackageState patchState, ref bool fCancel)
+        {
+            DetectPatchTargetEventArgs args = new DetectPatchTargetEventArgs(wzPackageId, wzProductCode, patchState, fCancel);
+            this.OnDetectPatchTarget(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectMsiFeature(string wzPackageId, string wzFeatureId, FeatureState state, ref bool fCancel)
+        {
+            DetectMsiFeatureEventArgs args = new DetectMsiFeatureEventArgs(wzPackageId, wzFeatureId, state, fCancel);
+            this.OnDetectMsiFeature(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectPackageComplete(string wzPackageId, int hrStatus, PackageState state, bool fCached)
+        {
+            DetectPackageCompleteEventArgs args = new DetectPackageCompleteEventArgs(wzPackageId, hrStatus, state, fCached);
+            this.OnDetectPackageComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnDetectComplete(int hrStatus, bool fEligibleForCleanup)
+        {
+            DetectCompleteEventArgs args = new DetectCompleteEventArgs(hrStatus, fEligibleForCleanup);
+            this.OnDetectComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanBegin(int cPackages, ref bool fCancel)
+        {
+            PlanBeginEventArgs args = new PlanBeginEventArgs(cPackages, fCancel);
+            this.OnPlanBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanRelatedBundle(string wzBundleId, RequestState recommendedState, ref RequestState pRequestedState, ref bool fCancel)
+        {
+            PlanRelatedBundleEventArgs args = new PlanRelatedBundleEventArgs(wzBundleId, recommendedState, pRequestedState, fCancel);
+            this.OnPlanRelatedBundle(args);
+            pRequestedState = args.State;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanPackageBegin(string wzPackageId, PackageState state, bool fCached, BOOTSTRAPPER_PACKAGE_CONDITION_RESULT installCondition, RequestState recommendedState, BOOTSTRAPPER_CACHE_TYPE recommendedCacheType, ref RequestState pRequestedState, ref BOOTSTRAPPER_CACHE_TYPE pRequestedCacheType, ref bool fCancel)
+        {
+            PlanPackageBeginEventArgs args = new PlanPackageBeginEventArgs(wzPackageId, state, fCached, installCondition, recommendedState, recommendedCacheType, pRequestedState, pRequestedCacheType, fCancel);
+            this.OnPlanPackageBegin(args);
+            pRequestedState = args.State;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanPatchTarget(string wzPackageId, string wzProductCode, RequestState recommendedState, ref RequestState pRequestedState, ref bool fCancel)
+        {
+            PlanPatchTargetEventArgs args = new PlanPatchTargetEventArgs(wzPackageId, wzProductCode, recommendedState, pRequestedState, fCancel);
+            this.OnPlanPatchTarget(args);
+            pRequestedState = args.State;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanMsiFeature(string wzPackageId, string wzFeatureId, FeatureState recommendedState, ref FeatureState pRequestedState, ref bool fCancel)
+        {
+            PlanMsiFeatureEventArgs args = new PlanMsiFeatureEventArgs(wzPackageId, wzFeatureId, recommendedState, pRequestedState, fCancel);
+            this.OnPlanMsiFeature(args);
+            pRequestedState = args.State;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanMsiPackage(string wzPackageId, bool fExecute, ActionState action, ref bool fCancel, ref BURN_MSI_PROPERTY actionMsiProperty, ref INSTALLUILEVEL uiLevel, ref bool fDisableExternalUiHandler)
+        {
+            PlanMsiPackageEventArgs args = new PlanMsiPackageEventArgs(wzPackageId, fExecute, action, fCancel, actionMsiProperty, uiLevel, fDisableExternalUiHandler);
+            this.OnPlanMsiPackage(args);
+            fCancel = args.Cancel;
+            actionMsiProperty = args.ActionMsiProperty;
+            uiLevel = args.UiLevel;
+            fDisableExternalUiHandler = args.DisableExternalUiHandler;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanPackageComplete(string wzPackageId, int hrStatus, RequestState requested)
+        {
+            var args = new PlanPackageCompleteEventArgs(wzPackageId, hrStatus, requested);
+            this.OnPlanPackageComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlannedPackage(string wzPackageId, ActionState execute, ActionState rollback, bool fPlannedCache, bool fPlannedUncache)
+        {
+            var args = new PlannedPackageEventArgs(wzPackageId, execute, rollback, fPlannedCache, fPlannedUncache);
+            this.OnPlannedPackage(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanComplete(int hrStatus)
+        {
+            PlanCompleteEventArgs args = new PlanCompleteEventArgs(hrStatus);
+            this.OnPlanComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnApplyBegin(int dwPhaseCount, ref bool fCancel)
+        {
+            this.applying = true;
+            ApplyBeginEventArgs args = new ApplyBeginEventArgs(dwPhaseCount, fCancel);
+            this.OnApplyBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnElevateBegin(ref bool fCancel)
+        {
+            ElevateBeginEventArgs args = new ElevateBeginEventArgs(fCancel);
+            this.OnElevateBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnElevateComplete(int hrStatus)
+        {
+            ElevateCompleteEventArgs args = new ElevateCompleteEventArgs(hrStatus);
+            this.OnElevateComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnProgress(int dwProgressPercentage, int dwOverallPercentage, ref bool fCancel)
+        {
+            ProgressEventArgs args = new ProgressEventArgs(dwProgressPercentage, dwOverallPercentage, fCancel);
+            this.OnProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnError(ErrorType errorType, string wzPackageId, int dwCode, string wzError, int dwUIHint, int cData, string[] rgwzData, Result nRecommendation, ref Result pResult)
+        {
+            ErrorEventArgs args = new ErrorEventArgs(errorType, wzPackageId, dwCode, wzError, dwUIHint, rgwzData, nRecommendation, pResult);
+            this.OnError(args);
+            pResult = args.Result;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnRegisterBegin(ref bool fCancel)
+        {
+            RegisterBeginEventArgs args = new RegisterBeginEventArgs(fCancel);
+            this.OnRegisterBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnRegisterComplete(int hrStatus)
+        {
+            RegisterCompleteEventArgs args = new RegisterCompleteEventArgs(hrStatus);
+            this.OnRegisterComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheBegin(ref bool fCancel)
+        {
+            CacheBeginEventArgs args = new CacheBeginEventArgs(fCancel);
+            this.OnCacheBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCachePackageBegin(string wzPackageId, int cCachePayloads, long dw64PackageCacheSize, ref bool fCancel)
+        {
+            CachePackageBeginEventArgs args = new CachePackageBeginEventArgs(wzPackageId, cCachePayloads, dw64PackageCacheSize, fCancel);
+            this.OnCachePackageBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheAcquireBegin(string wzPackageOrContainerId, string wzPayloadId, string wzSource, string wzDownloadUrl, string wzPayloadContainerId, CacheOperation recommendation, ref CacheOperation action, ref bool fCancel)
+        {
+            CacheAcquireBeginEventArgs args = new CacheAcquireBeginEventArgs(wzPackageOrContainerId, wzPayloadId, wzSource, wzDownloadUrl, wzPayloadContainerId, recommendation, action, fCancel);
+            this.OnCacheAcquireBegin(args);
+            action = args.Action;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheAcquireProgress(string wzPackageOrContainerId, string wzPayloadId, long dw64Progress, long dw64Total, int dwOverallPercentage, ref bool fCancel)
+        {
+            CacheAcquireProgressEventArgs args = new CacheAcquireProgressEventArgs(wzPackageOrContainerId, wzPayloadId, dw64Progress, dw64Total, dwOverallPercentage, fCancel);
+            this.OnCacheAcquireProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheAcquireResolving(string wzPackageOrContainerId, string wzPayloadId, string[] searchPaths, int cSearchPaths, bool fFoundLocal, int dwRecommendedSearchPath, string wzDownloadUrl, string wzPayloadContainerId, CacheResolveOperation recommendation, ref int dwChosenSearchPath, ref CacheResolveOperation action, ref bool fCancel)
+        {
+            CacheAcquireResolvingEventArgs args = new CacheAcquireResolvingEventArgs(wzPackageOrContainerId, wzPayloadId, searchPaths, fFoundLocal, dwRecommendedSearchPath, wzDownloadUrl, wzPayloadContainerId, recommendation, dwChosenSearchPath, action, fCancel);
+            this.OnCacheAcquireResolving(args);
+            dwChosenSearchPath = args.ChosenSearchPath;
+            action = args.Action;
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheAcquireComplete(string wzPackageOrContainerId, string wzPayloadId, int hrStatus, BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION recommendation, ref BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION action)
+        {
+            CacheAcquireCompleteEventArgs args = new CacheAcquireCompleteEventArgs(wzPackageOrContainerId, wzPayloadId, hrStatus, recommendation, action);
+            this.OnCacheAcquireComplete(args);
+            action = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheVerifyBegin(string wzPackageOrContainerId, string wzPayloadId, ref bool fCancel)
+        {
+            CacheVerifyBeginEventArgs args = new CacheVerifyBeginEventArgs(wzPackageOrContainerId, wzPayloadId, fCancel);
+            this.OnCacheVerifyBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheVerifyProgress(string wzPackageOrContainerId, string wzPayloadId, long dw64Progress, long dw64Total, int dwOverallPercentage, CacheVerifyStep verifyStep, ref bool fCancel)
+        {
+            CacheVerifyProgressEventArgs args = new CacheVerifyProgressEventArgs(wzPackageOrContainerId, wzPayloadId, dw64Progress, dw64Total, dwOverallPercentage, verifyStep, fCancel);
+            this.OnCacheVerifyProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheVerifyComplete(string wzPackageOrContainerId, string wzPayloadId, int hrStatus, BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION recommendation, ref BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION action)
+        {
+            CacheVerifyCompleteEventArgs args = new CacheVerifyCompleteEventArgs(wzPackageOrContainerId, wzPayloadId, hrStatus, recommendation, action);
+            this.OnCacheVerifyComplete(args);
+            action = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCachePackageComplete(string wzPackageId, int hrStatus, BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION recommendation, ref BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION action)
+        {
+            CachePackageCompleteEventArgs args = new CachePackageCompleteEventArgs(wzPackageId, hrStatus, recommendation, action);
+            this.OnCachePackageComplete(args);
+            action = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheComplete(int hrStatus)
+        {
+            CacheCompleteEventArgs args = new CacheCompleteEventArgs(hrStatus);
+            this.OnCacheComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecuteBegin(int cExecutingPackages, ref bool fCancel)
+        {
+            ExecuteBeginEventArgs args = new ExecuteBeginEventArgs(cExecutingPackages, fCancel);
+            this.OnExecuteBegin(args);
+            args.Cancel = fCancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecutePackageBegin(string wzPackageId, bool fExecute, ActionState action, INSTALLUILEVEL uiLevel, bool fDisableExternalUiHandler, ref bool fCancel)
+        {
+            ExecutePackageBeginEventArgs args = new ExecutePackageBeginEventArgs(wzPackageId, fExecute, action, uiLevel, fDisableExternalUiHandler, fCancel);
+            this.OnExecutePackageBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecutePatchTarget(string wzPackageId, string wzTargetProductCode, ref bool fCancel)
+        {
+            ExecutePatchTargetEventArgs args = new ExecutePatchTargetEventArgs(wzPackageId, wzTargetProductCode, fCancel);
+            this.OnExecutePatchTarget(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecuteProgress(string wzPackageId, int dwProgressPercentage, int dwOverallPercentage, ref bool fCancel)
+        {
+            ExecuteProgressEventArgs args = new ExecuteProgressEventArgs(wzPackageId, dwProgressPercentage, dwOverallPercentage, fCancel);
+            this.OnExecuteProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecuteMsiMessage(string wzPackageId, InstallMessage messageType, int dwUIHint, string wzMessage, int cData, string[] rgwzData, Result nRecommendation, ref Result pResult)
+        {
+            ExecuteMsiMessageEventArgs args = new ExecuteMsiMessageEventArgs(wzPackageId, messageType, dwUIHint, wzMessage, rgwzData, nRecommendation, pResult);
+            this.OnExecuteMsiMessage(args);
+            pResult = args.Result;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecuteFilesInUse(string wzPackageId, int cFiles, string[] rgwzFiles, Result nRecommendation, ref Result pResult)
+        {
+            ExecuteFilesInUseEventArgs args = new ExecuteFilesInUseEventArgs(wzPackageId, rgwzFiles, nRecommendation, pResult);
+            this.OnExecuteFilesInUse(args);
+            pResult = args.Result;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecutePackageComplete(string wzPackageId, int hrStatus, ApplyRestart restart, BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION recommendation, ref BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION pAction)
+        {
+            ExecutePackageCompleteEventArgs args = new ExecutePackageCompleteEventArgs(wzPackageId, hrStatus, restart, recommendation, pAction);
+            this.OnExecutePackageComplete(args);
+            pAction = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnExecuteComplete(int hrStatus)
+        {
+            ExecuteCompleteEventArgs args = new ExecuteCompleteEventArgs(hrStatus);
+            this.OnExecuteComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnUnregisterBegin(bool fKeepRegistration, ref bool fForceKeepRegistration)
+        {
+            UnregisterBeginEventArgs args = new UnregisterBeginEventArgs(fKeepRegistration, fForceKeepRegistration);
+            this.OnUnregisterBegin(args);
+            fForceKeepRegistration = args.ForceKeepRegistration;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnUnregisterComplete(int hrStatus)
+        {
+            UnregisterCompleteEventArgs args = new UnregisterCompleteEventArgs(hrStatus);
+            this.OnUnregisterComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnApplyComplete(int hrStatus, ApplyRestart restart, BOOTSTRAPPER_APPLYCOMPLETE_ACTION recommendation, ref BOOTSTRAPPER_APPLYCOMPLETE_ACTION pAction)
+        {
+            ApplyCompleteEventArgs args = new ApplyCompleteEventArgs(hrStatus, restart, recommendation, pAction);
+            this.OnApplyComplete(args);
+            this.applying = false;
+            pAction = args.Action;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnLaunchApprovedExeBegin(ref bool fCancel)
+        {
+            LaunchApprovedExeBeginEventArgs args = new LaunchApprovedExeBeginEventArgs(fCancel);
+            this.OnLaunchApprovedExeBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnLaunchApprovedExeComplete(int hrStatus, int processId)
+        {
+            LaunchApprovedExeCompleteEventArgs args = new LaunchApprovedExeCompleteEventArgs(hrStatus, processId);
+            this.OnLaunchApprovedExeComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnBeginMsiTransactionBegin(string transactionId, ref bool fCancel)
+        {
+            BeginMsiTransactionBeginEventArgs args = new BeginMsiTransactionBeginEventArgs(transactionId, fCancel);
+            this.OnBeginMsiTransactionBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnBeginMsiTransactionComplete(string transactionId, int hrStatus)
+        {
+            BeginMsiTransactionCompleteEventArgs args = new BeginMsiTransactionCompleteEventArgs(transactionId, hrStatus);
+            this.OnBeginMsiTransactionComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCommitMsiTransactionBegin(string transactionId, ref bool fCancel)
+        {
+            CommitMsiTransactionBeginEventArgs args = new CommitMsiTransactionBeginEventArgs(transactionId, fCancel);
+            this.OnCommitMsiTransactionBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCommitMsiTransactionComplete(string transactionId, int hrStatus)
+        {
+            CommitMsiTransactionCompleteEventArgs args = new CommitMsiTransactionCompleteEventArgs(transactionId, hrStatus);
+            this.OnCommitMsiTransactionComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnRollbackMsiTransactionBegin(string transactionId)
+        {
+            RollbackMsiTransactionBeginEventArgs args = new RollbackMsiTransactionBeginEventArgs(transactionId);
+            this.OnRollbackMsiTransactionBegin(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnRollbackMsiTransactionComplete(string transactionId, int hrStatus)
+        {
+            RollbackMsiTransactionCompleteEventArgs args = new RollbackMsiTransactionCompleteEventArgs(transactionId, hrStatus);
+            this.OnRollbackMsiTransactionComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPauseAutomaticUpdatesBegin()
+        {
+            PauseAutomaticUpdatesBeginEventArgs args = new PauseAutomaticUpdatesBeginEventArgs();
+            this.OnPauseAutomaticUpdatesBegin(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPauseAutomaticUpdatesComplete(int hrStatus)
+        {
+            PauseAutomaticUpdatesCompleteEventArgs args = new PauseAutomaticUpdatesCompleteEventArgs(hrStatus);
+            this.OnPauseAutomaticUpdatesComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnSystemRestorePointBegin()
+        {
+            SystemRestorePointBeginEventArgs args = new SystemRestorePointBeginEventArgs();
+            this.OnSystemRestorePointBegin(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnSystemRestorePointComplete(int hrStatus)
+        {
+            SystemRestorePointCompleteEventArgs args = new SystemRestorePointCompleteEventArgs(hrStatus);
+            this.OnSystemRestorePointComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnPlanForwardCompatibleBundle(string wzBundleId, RelationType relationType, string wzBundleTag, bool fPerMachine, string wzVersion, bool fRecommendedIgnoreBundle, ref bool fCancel, ref bool fIgnoreBundle)
+        {
+            PlanForwardCompatibleBundleEventArgs args = new PlanForwardCompatibleBundleEventArgs(wzBundleId, relationType, wzBundleTag, fPerMachine, wzVersion, fRecommendedIgnoreBundle, fCancel, fIgnoreBundle);
+            this.OnPlanForwardCompatibleBundle(args);
+            fCancel = args.Cancel;
+            fIgnoreBundle = args.IgnoreBundle;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheContainerOrPayloadVerifyBegin(string wzPackageOrContainerId, string wzPayloadId, ref bool fCancel)
+        {
+            CacheContainerOrPayloadVerifyBeginEventArgs args = new CacheContainerOrPayloadVerifyBeginEventArgs(wzPackageOrContainerId, wzPayloadId, fCancel);
+            this.OnCacheContainerOrPayloadVerifyBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheContainerOrPayloadVerifyProgress(string wzPackageOrContainerId, string wzPayloadId, long dw64Progress, long dw64Total, int dwOverallPercentage, ref bool fCancel)
+        {
+            CacheContainerOrPayloadVerifyProgressEventArgs args = new CacheContainerOrPayloadVerifyProgressEventArgs(wzPackageOrContainerId, wzPayloadId, dw64Progress, dw64Total, dwOverallPercentage, fCancel);
+            this.OnCacheContainerOrPayloadVerifyProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCacheContainerOrPayloadVerifyComplete(string wzPackageOrContainerId, string wzPayloadId, int hrStatus)
+        {
+            CacheContainerOrPayloadVerifyCompleteEventArgs args = new CacheContainerOrPayloadVerifyCompleteEventArgs(wzPackageOrContainerId, wzPayloadId, hrStatus);
+            this.OnCacheContainerOrPayloadVerifyComplete(args);
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCachePayloadExtractBegin(string wzContainerId, string wzPayloadId, ref bool fCancel)
+        {
+            CachePayloadExtractBeginEventArgs args = new CachePayloadExtractBeginEventArgs(wzContainerId, wzPayloadId, fCancel);
+            this.OnCachePayloadExtractBegin(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCachePayloadExtractProgress(string wzContainerId, string wzPayloadId, long dw64Progress, long dw64Total, int dwOverallPercentage, ref bool fCancel)
+        {
+            CachePayloadExtractProgressEventArgs args = new CachePayloadExtractProgressEventArgs(wzContainerId, wzPayloadId, dw64Progress, dw64Total, dwOverallPercentage, fCancel);
+            this.OnCachePayloadExtractProgress(args);
+            fCancel = args.Cancel;
+            return args.HResult;
+        }
+        int IBootstrapperApplication.OnCachePayloadExtractComplete(string wzContainerId, string wzPayloadId, int hrStatus)
+        {
+            CachePayloadExtractCompleteEventArgs args = new CachePayloadExtractCompleteEventArgs(wzContainerId, wzPayloadId, hrStatus);
+            this.OnCachePayloadExtractComplete(args);
+            return args.HResult;
+        }
+        #endregion
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationData.cs b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationData.cs
new file mode 100644
index 00000000..739a08bb
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationData.cs
@@ -0,0 +1,101 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.IO;
+    using System.Xml.XPath;
+    /// <summary>
+    /// Utility class for reading BootstrapperApplicationData.xml.
+    /// </summary>
+    public class BootstrapperApplicationData : IBootstrapperApplicationData
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public const string DefaultFileName = "BootstrapperApplicationData.xml";
+        /// <summary>
+        /// 
+        /// </summary>
+        public const string XMLNamespace = "http://wixtoolset.org/schemas/v4/BootstrapperApplicationData";
+        /// <summary>
+        /// The default path of where the BA was extracted to.
+        /// </summary>
+        public static readonly DirectoryInfo DefaultFolder;
+        /// <summary>
+        /// The default path to BootstrapperApplicationData.xml.
+        /// </summary>
+        public static readonly FileInfo DefaultFile;
+        static BootstrapperApplicationData()
+        {
+            DefaultFolder = new DirectoryInfo(AppDomain.CurrentDomain.BaseDirectory);
+            DefaultFile = new FileInfo(Path.Combine(DefaultFolder.FullName, DefaultFileName));
+        }
+        /// <inheritdoc/>
+        public FileInfo BADataFile { get; private set; }
+        /// <inheritdoc/>
+        public IBundleInfo Bundle { get; private set; }
+        /// <summary>
+        /// Uses the default location for BootstrapperApplicationData.xml.
+        /// </summary>
+        public BootstrapperApplicationData() : this(DefaultFile) { }
+        /// <summary>
+        /// Uses the given file for BootstrapperApplicationData.xml.
+        /// </summary>
+        /// <param name="baDataFile"></param>
+        public BootstrapperApplicationData(FileInfo baDataFile)
+        {
+            this.BADataFile = baDataFile;
+            using (FileStream fs = this.BADataFile.OpenRead())
+            {
+                this.Bundle = BundleInfo.ParseBundleFromStream(fs);
+            }
+        }
+        /// <summary>
+        /// Utility method for parsing BootstrapperApplicationData.xml.
+        /// </summary>
+        /// <param name="node"></param>
+        /// <param name="attributeName"></param>
+        /// <returns></returns>
+        public static string GetAttribute(XPathNavigator node, string attributeName)
+        {
+            XPathNavigator attribute = node.SelectSingleNode("@" + attributeName);
+            if (attribute == null)
+            {
+                return null;
+            }
+            return attribute.Value;
+        }
+        /// <summary>
+        /// Utility method for parsing BootstrapperApplicationData.xml.
+        /// </summary>
+        /// <param name="node"></param>
+        /// <param name="attributeName"></param>
+        /// <returns></returns>
+        public static bool? GetYesNoAttribute(XPathNavigator node, string attributeName)
+        {
+            string attributeValue = GetAttribute(node, attributeName);
+            if (attributeValue == null)
+            {
+                return null;
+            }
+            return attributeValue.Equals("yes", StringComparison.InvariantCulture);
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationFactoryAttribute.cs b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationFactoryAttribute.cs
new file mode 100644
index 00000000..95252cf3
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BootstrapperApplicationFactoryAttribute.cs
@@ -0,0 +1,35 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    /// <summary>
+    /// Identifies the bootstrapper application factory class.
+    /// </summary>
+    /// <remarks>
+    /// This required assembly attribute identifies the bootstrapper application factory class.
+    /// </remarks>
+    [AttributeUsage(AttributeTargets.Assembly, AllowMultiple = false)]
+    public sealed class BootstrapperApplicationFactoryAttribute : Attribute
+    {
+        private Type bootstrapperApplicationFactoryType;
+        /// <summary>
+        /// Creates a new instance of the <see cref="BootstrapperApplicationFactoryAttribute"/> class.
+        /// </summary>
+        /// <param name="bootstrapperApplicationFactoryType">The <see cref="Type"/> of the BA factory.</param>
+        public BootstrapperApplicationFactoryAttribute(Type bootstrapperApplicationFactoryType)
+        {
+            this.bootstrapperApplicationFactoryType = bootstrapperApplicationFactoryType;
+        }
+        /// <summary>
+        /// Gets the type of the bootstrapper application factory class to create.
+        /// </summary>
+        public Type BootstrapperApplicationFactoryType
+        {
+            get { return this.bootstrapperApplicationFactoryType; }
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BootstrapperCommand.cs b/src/api/burn/WixToolset.Mba.Core/BootstrapperCommand.cs
new file mode 100644
index 00000000..65dde0f4
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BootstrapperCommand.cs
@@ -0,0 +1,145 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.ComponentModel;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// Default implementation of <see cref="IBootstrapperCommand"/>.
+    /// </summary>
+    public sealed class BootstrapperCommand : IBootstrapperCommand
+    {
+        private readonly string commandLine;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="action"></param>
+        /// <param name="display"></param>
+        /// <param name="restart"></param>
+        /// <param name="commandLine"></param>
+        /// <param name="cmdShow"></param>
+        /// <param name="resume"></param>
+        /// <param name="splashScreen"></param>
+        /// <param name="relation"></param>
+        /// <param name="passthrough"></param>
+        /// <param name="layoutDirectory"></param>
+        /// <param name="bootstrapperWorkingFolder"></param>
+        /// <param name="bootstrapperApplicationDataPath"></param>
+        public BootstrapperCommand(
+            LaunchAction action,
+            Display display,
+            Restart restart,
+            string commandLine,
+            int cmdShow,
+            ResumeType resume,
+            IntPtr splashScreen,
+            RelationType relation,
+            bool passthrough,
+            string layoutDirectory,
+            string bootstrapperWorkingFolder,
+            string bootstrapperApplicationDataPath)
+        {
+            this.Action = action;
+            this.Display = display;
+            this.Restart = restart;
+            this.commandLine = commandLine;
+            this.CmdShow = cmdShow;
+            this.Resume = resume;
+            this.SplashScreen = splashScreen;
+            this.Relation = relation;
+            this.Passthrough = passthrough;
+            this.LayoutDirectory = layoutDirectory;
+            this.BootstrapperWorkingFolder = bootstrapperWorkingFolder;
+            this.BootstrapperApplicationDataPath = bootstrapperApplicationDataPath;
+        }
+        /// <inheritdoc/>
+        public LaunchAction Action { get; }
+        /// <inheritdoc/>
+        public Display Display { get; }
+        /// <inheritdoc/>
+        public Restart Restart { get; }
+        /// <inheritdoc/>
+        public string[] CommandLineArgs => GetCommandLineArgs(this.commandLine);
+        /// <inheritdoc/>
+        public int CmdShow { get; }
+        /// <inheritdoc/>
+        public ResumeType Resume { get; }
+        /// <inheritdoc/>
+        public IntPtr SplashScreen { get; }
+        /// <inheritdoc/>
+        public RelationType Relation { get; }
+        /// <inheritdoc/>
+        public bool Passthrough { get; }
+        /// <inheritdoc/>
+        public string LayoutDirectory { get; }
+        /// <inheritdoc/>
+        public string BootstrapperWorkingFolder { get; }
+        /// <inheritdoc/>
+        public string BootstrapperApplicationDataPath { get; }
+        /// <summary>
+        /// Gets the command line arguments as a string array.
+        /// </summary>
+        /// <returns>
+        /// Array of command line arguments.
+        /// </returns>
+        /// <exception type="Win32Exception">The command line could not be parsed into an array.</exception>
+        /// <remarks>
+        /// This method uses the same parsing as the operating system which handles quotes and spaces correctly.
+        /// </remarks>
+        public static string[] GetCommandLineArgs(string commandLine)
+        {
+            if (null == commandLine)
+            {
+                return new string[0];
+            }
+            // Parse the filtered command line arguments into a native array.
+            int argc = 0;
+            // CommandLineToArgvW tries to treat the first argument as the path to the process,
+            // which fails pretty miserably if your first argument is something like
+            // FOO="C:\Program Files\My Company". So give it something harmless to play with.
+            IntPtr argv = NativeMethods.CommandLineToArgvW("ignored " + commandLine, out argc);
+            if (IntPtr.Zero == argv)
+            {
+                // Throw an exception with the last error.
+                throw new Win32Exception();
+            }
+            // Marshal each native array pointer to a managed string.
+            try
+            {
+                // Skip "ignored" argument/hack.
+                string[] args = new string[argc - 1];
+                for (int i = 1; i < argc; ++i)
+                {
+                    IntPtr argvi = Marshal.ReadIntPtr(argv, i * IntPtr.Size);
+                    args[i - 1] = Marshal.PtrToStringUni(argvi);
+                }
+                return args;
+            }
+            finally
+            {
+                NativeMethods.LocalFree(argv);
+            }
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/BundleInfo.cs b/src/api/burn/WixToolset.Mba.Core/BundleInfo.cs
new file mode 100644
index 00000000..3d5d535d
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/BundleInfo.cs
@@ -0,0 +1,86 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Collections.Generic;
+    using System.IO;
+    using System.Xml;
+    using System.Xml.XPath;
+    /// <summary>
+    /// Default implementation of <see cref="IBundleInfo"/>.
+    /// </summary>
+    public class BundleInfo : IBundleInfo
+    {
+        /// <inheritdoc/>
+        public bool PerMachine { get; internal set; }
+        /// <inheritdoc/>
+        public string Name { get; internal set; }
+        /// <inheritdoc/>
+        public string LogVariable { get; internal set; }
+        /// <inheritdoc/>
+        public IDictionary<string, IPackageInfo> Packages { get; internal set; }
+        internal BundleInfo()
+        {
+            this.Packages = new Dictionary<string, IPackageInfo>();
+        }
+        /// <inheritdoc/>
+        public IPackageInfo AddRelatedBundleAsPackage(DetectRelatedBundleEventArgs e)
+        {
+            var package = PackageInfo.GetRelatedBundleAsPackage(e.ProductCode, e.RelationType, e.PerMachine, e.Version);
+            this.Packages.Add(package.Id, package);
+            return package;
+        }
+        /// <summary>
+        /// Parses BA manifest from the given stream.
+        /// </summary>
+        /// <param name="stream"></param>
+        /// <returns></returns>
+        public static IBundleInfo ParseBundleFromStream(Stream stream)
+        {
+            XPathDocument manifest = new XPathDocument(stream);
+            XPathNavigator root = manifest.CreateNavigator();
+            return ParseBundleFromXml(root);
+        }
+        /// <summary>
+        /// Parses BA manifest from the given <see cref="XPathNavigator"/>.
+        /// </summary>
+        /// <param name="root">The root of the BA manifest.</param>
+        /// <returns></returns>
+        public static IBundleInfo ParseBundleFromXml(XPathNavigator root)
+        {
+            BundleInfo bundle = new BundleInfo();
+            XmlNamespaceManager namespaceManager = new XmlNamespaceManager(root.NameTable);
+            namespaceManager.AddNamespace("p", BootstrapperApplicationData.XMLNamespace);
+            XPathNavigator bundleNode = root.SelectSingleNode("/p:BootstrapperApplicationData/p:WixBundleProperties", namespaceManager);
+            if (bundleNode == null)
+            {
+                throw new Exception("Failed to select bundle information.");
+            }
+            bool? perMachine = BootstrapperApplicationData.GetYesNoAttribute(bundleNode, "PerMachine");
+            if (perMachine.HasValue)
+            {
+                bundle.PerMachine = perMachine.Value;
+            }
+            bundle.Name = BootstrapperApplicationData.GetAttribute(bundleNode, "DisplayName");
+            bundle.LogVariable = BootstrapperApplicationData.GetAttribute(bundleNode, "LogPathVariable");
+            bundle.Packages = PackageInfo.ParsePackagesFromXml(root);
+            return bundle;
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/Engine.cs b/src/api/burn/WixToolset.Mba.Core/Engine.cs
new file mode 100644
index 00000000..aed420d5
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/Engine.cs
@@ -0,0 +1,541 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.ComponentModel;
+    using System.Runtime.InteropServices;
+    using System.Security;
+    using System.Text;
+    /// <summary>
+    /// Default implementation of <see cref="IEngine"/>.
+    /// </summary>
+    public sealed class Engine : IEngine
+    {
+        // Burn errs on empty strings, so declare initial buffer size.
+        private const int InitialBufferSize = 80;
+        private static readonly string normalizeVersionFormatString = "{0} must be less than or equal to " + UInt16.MaxValue;
+        private IBootstrapperEngine engine;
+        /// <summary>
+        /// Creates a new instance of the <see cref="Engine"/> container class.
+        /// </summary>
+        /// <param name="engine">The <see cref="IBootstrapperEngine"/> to contain.</param>
+        internal Engine(IBootstrapperEngine engine)
+        {
+            this.engine = engine;
+        }
+        /// <inheritdoc/>
+        public int PackageCount
+        {
+            get
+            {
+                int count;
+                this.engine.GetPackageCount(out count);
+                return count;
+            }
+        }
+        /// <inheritdoc/>
+        public void Apply(IntPtr hwndParent)
+        {
+            this.engine.Apply(hwndParent);
+        }
+        /// <inheritdoc/>
+        public void CloseSplashScreen()
+        {
+            this.engine.CloseSplashScreen();
+        }
+        /// <inheritdoc/>
+        public int CompareVersions(string version1, string version2)
+        {
+            this.engine.CompareVersions(version1, version2, out var result);
+            return result;
+        }
+        /// <inheritdoc/>
+        public bool ContainsVariable(string name)
+        {
+            IntPtr capacity = new IntPtr(0);
+            int ret = this.engine.GetVariableString(name, IntPtr.Zero, ref capacity);
+            return NativeMethods.E_NOTFOUND != ret;
+        }
+        /// <inheritdoc/>
+        public void Detect()
+        {
+            this.Detect(IntPtr.Zero);
+        }
+        /// <inheritdoc/>
+        public void Detect(IntPtr hwndParent)
+        {
+            this.engine.Detect(hwndParent);
+        }
+        /// <inheritdoc/>
+        public bool Elevate(IntPtr hwndParent)
+        {
+            int ret = this.engine.Elevate(hwndParent);
+            if (NativeMethods.S_OK == ret || NativeMethods.E_ALREADYINITIALIZED == ret)
+            {
+                return true;
+            }
+            else if (NativeMethods.E_CANCELLED == ret)
+            {
+                return false;
+            }
+            else
+            {
+                throw new Win32Exception(ret);
+            }
+        }
+        /// <inheritdoc/>
+        public string EscapeString(string input)
+        {
+            IntPtr capacity = new IntPtr(InitialBufferSize);
+            StringBuilder sb = new StringBuilder(capacity.ToInt32());
+            // Get the size of the buffer.
+            int ret = this.engine.EscapeString(input, sb, ref capacity);
+            if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+            {
+                capacity = new IntPtr(capacity.ToInt32() + 1); // Add one for the null terminator.
+                sb.Capacity = capacity.ToInt32();
+                ret = this.engine.EscapeString(input, sb, ref capacity);
+            }
+            if (NativeMethods.S_OK != ret)
+            {
+                throw new Win32Exception(ret);
+            }
+            return sb.ToString();
+        }
+        /// <inheritdoc/>
+        public bool EvaluateCondition(string condition)
+        {
+            bool value;
+            this.engine.EvaluateCondition(condition, out value);
+            return value;
+        }
+        /// <inheritdoc/>
+        public string FormatString(string format)
+        {
+            IntPtr capacity = new IntPtr(InitialBufferSize);
+            StringBuilder sb = new StringBuilder(capacity.ToInt32());
+            // Get the size of the buffer.
+            int ret = this.engine.FormatString(format, sb, ref capacity);
+            if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+            {
+                capacity = new IntPtr(capacity.ToInt32() + 1); // Add one for the null terminator.
+                sb.Capacity = capacity.ToInt32();
+                ret = this.engine.FormatString(format, sb, ref capacity);
+            }
+            if (NativeMethods.S_OK != ret)
+            {
+                throw new Win32Exception(ret);
+            }
+            return sb.ToString();
+        }
+        /// <inheritdoc/>
+        public long GetVariableNumeric(string name)
+        {
+            int ret = this.engine.GetVariableNumeric(name, out long value);
+            if (NativeMethods.S_OK != ret)
+            {
+                throw new Win32Exception(ret);
+            }
+            return value;
+        }
+        /// <inheritdoc/>
+        public SecureString GetVariableSecureString(string name)
+        {
+            var pUniString = this.getStringVariable(name, out var length);
+            try
+            {
+                return this.convertToSecureString(pUniString, length);
+            }
+            finally
+            {
+                if (IntPtr.Zero != pUniString)
+                {
+                    Marshal.FreeCoTaskMem(pUniString);
+                }
+            }
+        }
+        /// <inheritdoc/>
+        public string GetVariableString(string name)
+        {
+            int length;
+            IntPtr pUniString = this.getStringVariable(name, out length);
+            try
+            {
+                return Marshal.PtrToStringUni(pUniString, length);
+            }
+            finally
+            {
+                if (IntPtr.Zero != pUniString)
+                {
+                    Marshal.FreeCoTaskMem(pUniString);
+                }
+            }
+        }
+        /// <inheritdoc/>
+        public string GetVariableVersion(string name)
+        {
+            int length;
+            IntPtr pUniString = this.getVersionVariable(name, out length);
+            try
+            {
+                return Marshal.PtrToStringUni(pUniString, length);
+            }
+            finally
+            {
+                if (IntPtr.Zero != pUniString)
+                {
+                    Marshal.FreeCoTaskMem(pUniString);
+                }
+            }
+        }
+        /// <inheritdoc/>
+        public void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments)
+        {
+            this.LaunchApprovedExe(hwndParent, approvedExeForElevationId, arguments, 0);
+        }
+        /// <inheritdoc/>
+        public void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments, int waitForInputIdleTimeout)
+        {
+            this.engine.LaunchApprovedExe(hwndParent, approvedExeForElevationId, arguments, waitForInputIdleTimeout);
+        }
+        /// <inheritdoc/>
+        public void Log(LogLevel level, string message)
+        {
+            this.engine.Log(level, message);
+        }
+        /// <inheritdoc/>
+        public void Plan(LaunchAction action)
+        {
+            this.engine.Plan(action);
+        }
+        /// <inheritdoc/>
+        public void SetUpdate(string localSource, string downloadSource, long size, UpdateHashType hashType, byte[] hash)
+        {
+            this.engine.SetUpdate(localSource, downloadSource, size, hashType, hash, null == hash ? 0 : hash.Length);
+        }
+        /// <inheritdoc/>
+        public void SetUpdateSource(string url)
+        {
+            this.engine.SetUpdateSource(url);
+        }
+        /// <inheritdoc/>
+        public void SetLocalSource(string packageOrContainerId, string payloadId, string path)
+        {
+            this.engine.SetLocalSource(packageOrContainerId, payloadId, path);
+        }
+        /// <inheritdoc/>
+        public void SetDownloadSource(string packageOrContainerId, string payloadId, string url, string user, string password)
+        {
+            this.engine.SetDownloadSource(packageOrContainerId, payloadId, url, user, password);
+        }
+        /// <inheritdoc/>
+        public void SetVariableNumeric(string name, long value)
+        {
+            this.engine.SetVariableNumeric(name, value);
+        }
+        /// <inheritdoc/>
+        public void SetVariableString(string name, SecureString value, bool formatted)
+        {
+            IntPtr pValue = Marshal.SecureStringToCoTaskMemUnicode(value);
+            try
+            {
+                this.engine.SetVariableString(name, pValue, formatted);
+            }
+            finally
+            {
+                Marshal.FreeCoTaskMem(pValue);
+            }
+        }
+        /// <inheritdoc/>
+        public void SetVariableString(string name, string value, bool formatted)
+        {
+            IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
+            try
+            {
+                this.engine.SetVariableString(name, pValue, formatted);
+            }
+            finally
+            {
+                Marshal.FreeCoTaskMem(pValue);
+            }
+        }
+        /// <inheritdoc/>
+        public void SetVariableVersion(string name, string value)
+        {
+            IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
+            try
+            {
+                this.engine.SetVariableVersion(name, pValue);
+            }
+            finally
+            {
+                Marshal.FreeCoTaskMem(pValue);
+            }
+        }
+        /// <inheritdoc/>
+        public int SendEmbeddedError(int errorCode, string message, int uiHint)
+        {
+            int result = 0;
+            this.engine.SendEmbeddedError(errorCode, message, uiHint, out result);
+            return result;
+        }
+        /// <inheritdoc/>
+        public int SendEmbeddedProgress(int progressPercentage, int overallPercentage)
+        {
+            int result = 0;
+            this.engine.SendEmbeddedProgress(progressPercentage, overallPercentage, out result);
+            return result;
+        }
+        /// <inheritdoc/>
+        public void Quit(int exitCode)
+        {
+            this.engine.Quit(exitCode);
+        }
+        /// <summary>
+        /// Gets the variable given by <paramref name="name"/> as a string.
+        /// </summary>
+        /// <param name="name">The name of the variable to get.</param>
+        /// <param name="length">The length of the Unicode string.</param>
+        /// <returns>The value by a pointer to a Unicode string.  Must be freed by Marshal.FreeCoTaskMem.</returns>
+        /// <exception cref="Exception">An error occurred getting the variable.</exception>
+        internal IntPtr getStringVariable(string name, out int length)
+        {
+            IntPtr capacity = new IntPtr(InitialBufferSize);
+            bool success = false;
+            IntPtr pValue = Marshal.AllocCoTaskMem(capacity.ToInt32() * UnicodeEncoding.CharSize);
+            try
+            {
+                // Get the size of the buffer.
+                int ret = this.engine.GetVariableString(name, pValue, ref capacity);
+                if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+                {
+                    // Don't need to add 1 for the null terminator, the engine already includes that.
+                    pValue = Marshal.ReAllocCoTaskMem(pValue, capacity.ToInt32() * UnicodeEncoding.CharSize);
+                    ret = this.engine.GetVariableString(name, pValue, ref capacity);
+                }
+                if (NativeMethods.S_OK != ret)
+                {
+                    throw Marshal.GetExceptionForHR(ret);
+                }
+                // The engine only returns the exact length of the string if the buffer was too small, so calculate it ourselves.
+                int maxLength = capacity.ToInt32();
+                for (length = 0; length < maxLength; ++length)
+                {
+                    if (0 == Marshal.ReadInt16(pValue, length * UnicodeEncoding.CharSize))
+                    {
+                        break;
+                    }
+                }
+                success = true;
+                return pValue;
+            }
+            finally
+            {
+                if (!success && IntPtr.Zero != pValue)
+                {
+                    Marshal.FreeCoTaskMem(pValue);
+                }
+            }
+        }
+        /// <summary>
+        /// Gets the variable given by <paramref name="name"/> as a version string.
+        /// </summary>
+        /// <param name="name">The name of the variable to get.</param>
+        /// <param name="length">The length of the Unicode string.</param>
+        /// <returns>The value by a pointer to a Unicode string.  Must be freed by Marshal.FreeCoTaskMem.</returns>
+        /// <exception cref="Exception">An error occurred getting the variable.</exception>
+        internal IntPtr getVersionVariable(string name, out int length)
+        {
+            IntPtr capacity = new IntPtr(InitialBufferSize);
+            bool success = false;
+            IntPtr pValue = Marshal.AllocCoTaskMem(capacity.ToInt32() * UnicodeEncoding.CharSize);
+            try
+            {
+                // Get the size of the buffer.
+                int ret = this.engine.GetVariableVersion(name, pValue, ref capacity);
+                if (NativeMethods.E_INSUFFICIENT_BUFFER == ret || NativeMethods.E_MOREDATA == ret)
+                {
+                    // Don't need to add 1 for the null terminator, the engine already includes that.
+                    pValue = Marshal.ReAllocCoTaskMem(pValue, capacity.ToInt32() * UnicodeEncoding.CharSize);
+                    ret = this.engine.GetVariableVersion(name, pValue, ref capacity);
+                }
+                if (NativeMethods.S_OK != ret)
+                {
+                    throw Marshal.GetExceptionForHR(ret);
+                }
+                // The engine only returns the exact length of the string if the buffer was too small, so calculate it ourselves.
+                int maxLength = capacity.ToInt32();
+                for (length = 0; length < maxLength; ++length)
+                {
+                    if (0 == Marshal.ReadInt16(pValue, length * UnicodeEncoding.CharSize))
+                    {
+                        break;
+                    }
+                }
+                success = true;
+                return pValue;
+            }
+            finally
+            {
+                if (!success && IntPtr.Zero != pValue)
+                {
+                    Marshal.FreeCoTaskMem(pValue);
+                }
+            }
+        }
+        /// <summary>
+        /// Initialize a SecureString with the given Unicode string.
+        /// </summary>
+        /// <param name="pUniString">Pointer to Unicode string.</param>
+        /// <param name="length">The string's length.</param>
+        internal SecureString convertToSecureString(IntPtr pUniString, int length)
+        {
+            if (IntPtr.Zero == pUniString)
+            {
+                return null;
+            }
+            SecureString value = new SecureString();
+            short s;
+            char c;
+            for (int charIndex = 0; charIndex < length; charIndex++)
+            {
+                s = Marshal.ReadInt16(pUniString, charIndex * UnicodeEncoding.CharSize);
+                c = (char)s;
+                value.AppendChar(c);
+                s = 0;
+                c = (char)0;
+            }
+            return value;
+        }
+        /// <summary>
+        /// Utility method for converting a <see cref="Version"/> into a <see cref="long"/>.
+        /// </summary>
+        /// <param name="version"></param>
+        /// <returns></returns>
+        public static long VersionToLong(Version version)
+        {
+            // In Windows, each version component has a max value of 65535,
+            // so we truncate the version before shifting it, which will overflow if invalid.
+            long major = (long)(ushort)version.Major << 48;
+            long minor = (long)(ushort)version.Minor << 32;
+            long build = (long)(ushort)version.Build << 16;
+            long revision = (long)(ushort)version.Revision;
+            return major | minor | build | revision;
+        }
+        /// <summary>
+        /// Utility method for converting a <see cref="long"/> into a <see cref="Version"/>.
+        /// </summary>
+        /// <param name="version"></param>
+        /// <returns></returns>
+        public static Version LongToVersion(long version)
+        {
+            int major = (int)((version & ((long)0xffff << 48)) >> 48);
+            int minor = (int)((version & ((long)0xffff << 32)) >> 32);
+            int build = (int)((version & ((long)0xffff << 16)) >> 16);
+            int revision = (int)(version & 0xffff);
+            return new Version(major, minor, build, revision);
+        }
+        /// <summary>
+        /// Verifies that Version can be represented in a <see cref="long"/>.
+        /// If the Build or Revision fields are undefined, they are set to zero.
+        /// </summary>
+        public static Version NormalizeVersion(Version version)
+        {
+            if (version == null)
+            {
+                throw new ArgumentNullException("version");
+            }
+            int major = version.Major;
+            int minor = version.Minor;
+            int build = version.Build;
+            int revision = version.Revision;
+            if (major > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Major"));
+            }
+            if (minor > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Minor"));
+            }
+            if (build > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Build"));
+            }
+            if (build == -1)
+            {
+                build = 0;
+            }
+            if (revision > UInt16.MaxValue)
+            {
+                throw new ArgumentOutOfRangeException("version", String.Format(normalizeVersionFormatString, "Revision"));
+            }
+            if (revision == -1)
+            {
+                revision = 0;
+            }
+            return new Version(major, minor, build, revision);
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/EventArgs.cs b/src/api/burn/WixToolset.Mba.Core/EventArgs.cs
new file mode 100644
index 00000000..8ef8af14
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/EventArgs.cs
@@ -0,0 +1,2186 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    /// <summary>
+    /// Base class for BA <see cref="EventArgs"/> classes.
+    /// </summary>
+    [Serializable]
+    public abstract class HResultEventArgs : EventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="HResultEventArgs"/> class.
+        /// </summary>
+        public HResultEventArgs()
+        {
+        }
+        /// <summary>
+        /// Gets or sets the <see cref="HResult"/> of the operation. This is passed back to the engine.
+        /// </summary>
+        public int HResult { get; set; }
+    }
+    /// <summary>
+    /// Base class for cancellable BA <see cref="EventArgs"/> classes.
+    /// </summary>
+    [Serializable]
+    public abstract class CancellableHResultEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="CancellableHResultEventArgs"/> class.
+        /// </summary>
+        public CancellableHResultEventArgs(bool cancelRecommendation)
+        {
+            this.Cancel = cancelRecommendation;
+        }
+        /// <summary>
+        /// Gets or sets whether to cancel the operation. This is passed back to the engine.
+        /// </summary>
+        public bool Cancel { get; set; }
+    }
+    /// <summary>
+    /// Base class for <see cref="EventArgs"/> classes that must return a <see cref="Result"/>.
+    /// </summary>
+    [Serializable]
+    public abstract class ResultEventArgs : HResultEventArgs
+    {
+        /// <summary />
+        public ResultEventArgs(Result recommendation, Result result)
+        {
+            this.Recommendation = recommendation;
+            this.Result = result;
+        }
+        /// <summary>
+        /// Gets the recommended <see cref="Result"/> of the operation.
+        /// </summary>
+        public Result Recommendation { get; private set; }
+        /// <summary>
+        /// Gets or sets the <see cref="Result"/> of the operation. This is passed back to the engine.
+        /// </summary>
+        public Result Result { get; set; }
+    }
+    /// <summary>
+    /// Base class for <see cref="EventArgs"/> classes that receive status from the engine.
+    /// </summary>
+    [Serializable]
+    public abstract class StatusEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="StatusEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public StatusEventArgs(int hrStatus)
+        {
+            this.Status = hrStatus;
+        }
+        /// <summary>
+        /// Gets the return code of the operation.
+        /// </summary>
+        public int Status { get; private set; }
+    }
+    /// <summary>
+    /// Base class for <see cref="EventArgs"/> classes that receive status from the engine and return an action.
+    /// </summary>
+    public abstract class ActionEventArgs<T> : StatusEventArgs
+    {
+        /// <summary />
+        public ActionEventArgs(int hrStatus, T recommendation, T action)
+            : base(hrStatus)
+        {
+            this.Recommendation = recommendation;
+            this.Action = action;
+        }
+        /// <summary>
+        /// Gets the recommended action from the engine.
+        /// </summary>
+        public T Recommendation { get; private set; }
+        /// <summary>
+        /// Gets or sets the action to be performed. This is passed back to the engine.
+        /// </summary>
+        public T Action { get; set; }
+    }
+    /// <summary>
+    /// Base class for cancellable action BA <see cref="EventArgs"/> classes.
+    /// </summary>
+    [Serializable]
+    public abstract class CancellableActionEventArgs<T> : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CancellableActionEventArgs(bool cancelRecommendation, T recommendation, T action)
+            : base(cancelRecommendation)
+        {
+            this.Recommendation = recommendation;
+            this.Action = action;
+        }
+        /// <summary>
+        /// Gets the recommended action from the engine.
+        /// </summary>
+        public T Recommendation { get; private set; }
+        /// <summary>
+        /// Gets or sets the action to be performed. This is passed back to the engine.
+        /// </summary>
+        public T Action { get; set; }
+    }
+    /// <summary>
+    /// Base class for cache progress events.
+    /// </summary>
+    [Serializable]
+    public abstract class CacheProgressBaseEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CacheProgressBaseEventArgs(string packageOrContainerId, string payloadId, long progress, long total, int overallPercentage, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+            this.Progress = progress;
+            this.Total = total;
+            this.OverallPercentage = overallPercentage;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+        /// <summary>
+        /// Gets the number of bytes cached thus far.
+        /// </summary>
+        public long Progress { get; private set; }
+        /// <summary>
+        /// Gets the total bytes to cache.
+        /// </summary>
+        public long Total { get; private set; }
+        /// <summary>
+        /// Gets the overall percentage of progress of caching.
+        /// </summary>
+        public int OverallPercentage { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments used when startup has begun.
+    /// </summary>
+    [Serializable]
+    public class StartupEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="StartupEventArgs"/> class.
+        /// </summary>
+        public StartupEventArgs()
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments used when shutdown has begun.
+    /// </summary>
+    [Serializable]
+    public class ShutdownEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="ShutdownEventArgs"/> class.
+        /// </summary>
+        public ShutdownEventArgs(BOOTSTRAPPER_SHUTDOWN_ACTION action)
+        {
+            this.Action = action;
+        }
+        /// <summary>
+        /// The action for OnShutdown.
+        /// </summary>
+        public BOOTSTRAPPER_SHUTDOWN_ACTION Action { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.SystemShutdown"/>
+    /// </summary>
+    [Serializable]
+    public class SystemShutdownEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public SystemShutdownEventArgs(EndSessionReasons reasons, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.Reasons = reasons;
+        }
+        /// <summary>
+        /// Gets the reason the application is requested to close or being closed.
+        /// </summary>
+        /// <remarks>
+        /// <para>To prevent shutting down or logging off, set <see cref="CancellableHResultEventArgs.Cancel"/> to
+        /// true; otherwise, set it to false.</para>
+        /// <para>If <see cref="SystemShutdownEventArgs.Reasons"/> contains <see cref="EndSessionReasons.Critical"/>
+        /// the bootstrapper cannot prevent the shutdown and only has a few seconds to save state or perform any other
+        /// critical operations before being closed by the operating system.</para>
+        /// </remarks>
+        public EndSessionReasons Reasons { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectBegin"/>
+    /// </summary>
+    [Serializable]
+    public class DetectBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectBeginEventArgs(bool cached, bool installed, int packageCount, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.Cached = cached;
+            this.Installed = installed;
+            this.PackageCount = packageCount;
+        }
+        /// <summary>
+        /// Gets whether the bundle is cached.
+        /// </summary>
+        public bool Cached { get; private set; }
+        /// <summary>
+        /// Gets whether the bundle is installed.
+        /// </summary>
+        public bool Installed { get; private set; }
+        /// <summary>
+        /// Gets the number of packages to detect.
+        /// </summary>
+        public int PackageCount { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectForwardCompatibleBundle"/>
+    /// </summary>
+    [Serializable]
+    public class DetectForwardCompatibleBundleEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectForwardCompatibleBundleEventArgs(string bundleId, RelationType relationType, string bundleTag, bool perMachine, string version, bool missingFromCache, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.BundleId = bundleId;
+            this.RelationType = relationType;
+            this.BundleTag = bundleTag;
+            this.PerMachine = perMachine;
+            this.Version = version;
+            this.MissingFromCache = missingFromCache;
+        }
+        /// <summary>
+        /// Gets the identity of the forward compatible bundle detected.
+        /// </summary>
+        public string BundleId { get; private set; }
+        /// <summary>
+        /// Gets the relationship type of the forward compatible bundle.
+        /// </summary>
+        public RelationType RelationType { get; private set; }
+        /// <summary>
+        /// Gets the tag of the forward compatible bundle.
+        /// </summary>
+        public string BundleTag { get; private set; }
+        /// <summary>
+        /// Gets whether the detected forward compatible bundle is per machine.
+        /// </summary>
+        public bool PerMachine { get; private set; }
+        /// <summary>
+        /// Gets the version of the forward compatible bundle detected.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// Whether the forward compatible bundle is missing from the package cache.
+        /// </summary>
+        public bool MissingFromCache { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectUpdateBegin"/>
+    /// </summary>
+    [Serializable]
+    public class DetectUpdateBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectUpdateBeginEventArgs(string updateLocation, bool cancelRecommendation, bool skipRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.UpdateLocation = updateLocation;
+            this.Skip = skipRecommendation;
+        }
+        /// <summary>
+        /// Gets the identity of the bundle to detect.
+        /// </summary>
+        public string UpdateLocation { get; private set; }
+        /// <summary>
+        /// Whether to skip checking for bundle updates.
+        /// </summary>
+        public bool Skip { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectUpdate"/>
+    /// </summary>
+    [Serializable]
+    public class DetectUpdateEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectUpdateEventArgs(string updateLocation, long size, string version, string title, string summary, string contentType, string content, bool cancelRecommendation, bool stopRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.UpdateLocation = updateLocation;
+            this.Size = size;
+            this.Version = version;
+            this.Title = title;
+            this.Summary = summary;
+            this.ContentType = contentType;
+            this.Content = content;
+            this.StopProcessingUpdates = stopRecommendation;
+        }
+        /// <summary>
+        /// Gets the identity of the bundle to detect.
+        /// </summary>
+        public string UpdateLocation { get; private set; }
+        /// <summary>
+        /// Gets the size of the updated bundle.
+        /// </summary>
+        public long Size { get; private set; }
+        /// <summary>
+        /// Gets the version of the updated bundle.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// Gets the title of the the updated bundle.
+        /// </summary>
+        public string Title { get; private set; }
+        /// <summary>
+        /// Gets the summary of the updated bundle.
+        /// </summary>
+        public string Summary { get; private set; }
+        /// <summary>
+        /// Gets the content type of the content of the updated bundle.
+        /// </summary>
+        public string ContentType { get; private set; }
+        /// <summary>
+        /// Gets the content of the updated bundle.
+        /// </summary>
+        public string Content { get; private set; }
+        /// <summary>
+        /// Tells the engine to stop giving the rest of the updates found in the feed.
+        /// </summary>
+        public bool StopProcessingUpdates { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectUpdateComplete"/>
+    /// </summary>
+    [Serializable]
+    public class DetectUpdateCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary />
+        public DetectUpdateCompleteEventArgs(int hrStatus, bool ignoreRecommendation)
+            : base(hrStatus)
+        {
+            this.IgnoreError = ignoreRecommendation;
+        }
+        /// <summary>
+        /// If Status is an error, then set this to true to ignore it and continue detecting.
+        /// </summary>
+        public bool IgnoreError { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectRelatedBundle"/>
+    /// </summary>
+    [Serializable]
+    public class DetectRelatedBundleEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectRelatedBundleEventArgs(string productCode, RelationType relationType, string bundleTag, bool perMachine, string version, RelatedOperation operation, bool missingFromCache, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.ProductCode = productCode;
+            this.RelationType = relationType;
+            this.BundleTag = bundleTag;
+            this.PerMachine = perMachine;
+            this.Version = version;
+            this.Operation = operation;
+            this.MissingFromCache = missingFromCache;
+        }
+        /// <summary>
+        /// Gets the identity of the related bundle detected.
+        /// </summary>
+        public string ProductCode { get; private set; }
+        /// <summary>
+        /// Gets the relationship type of the related bundle.
+        /// </summary>
+        public RelationType RelationType { get; private set; }
+        /// <summary>
+        /// Gets the tag of the related package bundle.
+        /// </summary>
+        public string BundleTag { get; private set; }
+        /// <summary>
+        /// Gets whether the detected bundle is per machine.
+        /// </summary>
+        public bool PerMachine { get; private set; }
+        /// <summary>
+        /// Gets the version of the related bundle detected.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// Gets the operation that will be taken on the detected bundle.
+        /// </summary>
+        public RelatedOperation Operation { get; private set; }
+        /// <summary>
+        /// Whether the related bundle is missing from the package cache.
+        /// </summary>
+        public bool MissingFromCache { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectPackageBegin"/>
+    /// </summary>
+    [Serializable]
+    public class DetectPackageBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectPackageBeginEventArgs(string packageId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+        }
+        /// <summary>
+        /// Gets the identity of the package to detect.
+        /// </summary>
+        public string PackageId { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectRelatedMsiPackage"/>
+    /// </summary>
+    [Serializable]
+    public class DetectRelatedMsiPackageEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectRelatedMsiPackageEventArgs(string packageId, string upgradeCode, string productCode, bool perMachine, string version, RelatedOperation operation, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.UpgradeCode = upgradeCode;
+            this.ProductCode = productCode;
+            this.PerMachine = perMachine;
+            this.Version = version;
+            this.Operation = operation;
+        }
+        /// <summary>
+        /// Gets the identity of the product's package detected.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the upgrade code of the related package detected.
+        /// </summary>
+        public string UpgradeCode { get; private set; }
+        /// <summary>
+        /// Gets the identity of the related package detected.
+        /// </summary>
+        public string ProductCode { get; private set; }
+        /// <summary>
+        /// Gets whether the detected package is per machine.
+        /// </summary>
+        public bool PerMachine { get; private set; }
+        /// <summary>
+        /// Gets the version of the related package detected.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// Gets the operation that will be taken on the detected package.
+        /// </summary>
+        public RelatedOperation Operation { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectPatchTarget"/>
+    /// </summary>
+    public class DetectPatchTargetEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="packageId"></param>
+        /// <param name="productCode"></param>
+        /// <param name="state"></param>
+        /// <param name="cancelRecommendation"></param>
+        public DetectPatchTargetEventArgs(string packageId, string productCode, PackageState state, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ProductCode = productCode;
+            this.State = state;
+        }
+        /// <summary>
+        /// Gets the identity of the patch's package.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the product code of the target.
+        /// </summary>
+        public string ProductCode { get; private set; }
+        /// <summary>
+        /// Gets the detected patch state for the target.
+        /// </summary>
+        public PackageState State { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.DetectMsiFeature"/>
+    /// </summary>
+    public class DetectMsiFeatureEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public DetectMsiFeatureEventArgs(string packageId, string featureId, FeatureState state, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.FeatureId = featureId;
+            this.State = state;
+        }
+        /// <summary>
+        /// Gets the identity of the feature's package detected.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the identity of the feature detected.
+        /// </summary>
+        public string FeatureId { get; private set; }
+        /// <summary>
+        /// Gets the detected feature state.
+        /// </summary>
+        public FeatureState State { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments for <see cref="IDefaultBootstrapperApplication.DetectPackageComplete"/>.
+    /// </summary>
+    [Serializable]
+    public class DetectPackageCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary />
+        public DetectPackageCompleteEventArgs(string packageId, int hrStatus, PackageState state, bool cached)
+            : base(hrStatus)
+        {
+            this.PackageId = packageId;
+            this.State = state;
+            this.Cached = cached;
+        }
+        /// <summary>
+        /// Gets the identity of the package detected.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the state of the specified package.
+        /// </summary>
+        public PackageState State { get; private set; }
+        /// <summary>
+        /// Gets whether any part of the package is cached.
+        /// </summary>
+        public bool Cached { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments used when the detection phase has completed.
+    /// </summary>
+    [Serializable]
+    public class DetectCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="DetectCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        /// <param name="eligibleForCleanup"></param>
+        public DetectCompleteEventArgs(int hrStatus, bool eligibleForCleanup)
+            : base(hrStatus)
+        {
+            this.EligibleForCleanup = eligibleForCleanup;
+        }
+        /// <summary>
+        /// Indicates whether the engine will uninstall the bundle if shutdown without running Apply.
+        /// </summary>
+        public bool EligibleForCleanup { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanBegin"/>
+    /// </summary>
+    [Serializable]
+    public class PlanBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanBeginEventArgs(int packageCount, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageCount = packageCount;
+        }
+        /// <summary>
+        /// Gets the number of packages to plan for.
+        /// </summary>
+        public int PackageCount { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanRelatedBundle"/>
+    /// </summary>
+    [Serializable]
+    public class PlanRelatedBundleEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanRelatedBundleEventArgs(string bundleId, RequestState recommendedState, RequestState state, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.BundleId = bundleId;
+            this.RecommendedState = recommendedState;
+            this.State = state;
+        }
+        /// <summary>
+        /// Gets the identity of the bundle to plan for.
+        /// </summary>
+        public string BundleId { get; private set; }
+        /// <summary>
+        /// Gets the recommended requested state for the bundle.
+        /// </summary>
+        public RequestState RecommendedState { get; private set; }
+        /// <summary>
+        /// Gets or sets the requested state for the bundle.
+        /// </summary>
+        public RequestState State { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanPackageBegin"/>
+    /// </summary>
+    [Serializable]
+    public class PlanPackageBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanPackageBeginEventArgs(string packageId, PackageState currentState, bool cached, BOOTSTRAPPER_PACKAGE_CONDITION_RESULT installCondition, RequestState recommendedState, BOOTSTRAPPER_CACHE_TYPE recommendedCacheType, RequestState state, BOOTSTRAPPER_CACHE_TYPE cacheType, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.CurrentState = currentState;
+            this.Cached = cached;
+            this.InstallCondition = installCondition;
+            this.RecommendedState = recommendedState;
+            this.RecommendedCacheType = recommendedCacheType;
+            this.State = state;
+            this.CacheType = cacheType;
+        }
+        /// <summary>
+        /// Gets the identity of the package to plan for.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the current state of the package.
+        /// </summary>
+        public PackageState CurrentState { get; private set; }
+        /// <summary>
+        /// Gets whether any part of the package is cached.
+        /// </summary>
+        public bool Cached { get; private set; }
+        /// <summary>
+        /// Gets the evaluated result of the package's install condition.
+        /// </summary>
+        public BOOTSTRAPPER_PACKAGE_CONDITION_RESULT InstallCondition { get; private set; }
+        /// <summary>
+        /// Gets the recommended requested state for the package.
+        /// </summary>
+        public RequestState RecommendedState { get; private set; }
+        /// <summary>
+        /// The authored cache type of the package.
+        /// </summary>
+        public BOOTSTRAPPER_CACHE_TYPE RecommendedCacheType { get; private set; }
+        /// <summary>
+        /// Gets or sets the requested state for the package.
+        /// </summary>
+        public RequestState State { get; set; }
+        /// <summary>
+        /// Gets or sets the requested cache type for the package.
+        /// </summary>
+        public BOOTSTRAPPER_CACHE_TYPE CacheType { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanPatchTarget"/>
+    /// </summary>
+    [Serializable]
+    public class PlanPatchTargetEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="packageId"></param>
+        /// <param name="productCode"></param>
+        /// <param name="recommendedState"></param>
+        /// <param name="state"></param>
+        /// <param name="cancelRecommendation"></param>
+        public PlanPatchTargetEventArgs(string packageId, string productCode, RequestState recommendedState, RequestState state, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ProductCode = productCode;
+            this.RecommendedState = recommendedState;
+            this.State = state;
+        }
+        /// <summary>
+        /// Gets the identity of the patch's package.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the product code of the target.
+        /// </summary>
+        public string ProductCode { get; private set; }
+        /// <summary>
+        /// Gets the recommended state of the patch to use by planning for the target.
+        /// </summary>
+        public RequestState RecommendedState { get; private set; }
+        /// <summary>
+        /// Gets or sets the state of the patch to use by planning for the target.
+        /// </summary>
+        public RequestState State { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanMsiFeature"/>
+    /// </summary>
+    [Serializable]
+    public class PlanMsiFeatureEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanMsiFeatureEventArgs(string packageId, string featureId, FeatureState recommendedState, FeatureState state, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.FeatureId = featureId;
+            this.RecommendedState = recommendedState;
+            this.State = state;
+        }
+        /// <summary>
+        /// Gets the identity of the feature's package to plan.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the identity of the feature to plan.
+        /// </summary>
+        public string FeatureId { get; private set; }
+        /// <summary>
+        /// Gets the recommended feature state to use by planning.
+        /// </summary>
+        public FeatureState RecommendedState { get; private set; }
+        /// <summary>
+        /// Gets or sets the feature state to use by planning.
+        /// </summary>
+        public FeatureState State { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanMsiPackage"/>
+    /// </summary>
+    [Serializable]
+    public class PlanMsiPackageEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanMsiPackageEventArgs(string packageId, bool shouldExecute, ActionState action, bool cancelRecommendation, BURN_MSI_PROPERTY actionMsiProperty, INSTALLUILEVEL uiLevel, bool disableExternalUiHandler)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ShouldExecute = shouldExecute;
+            this.Action = action;
+            this.ActionMsiProperty = actionMsiProperty;
+            this.UiLevel = uiLevel;
+            this.DisableExternalUiHandler = disableExternalUiHandler;
+        }
+        /// <summary>
+        /// Gets identity of the package planned for.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets whether the package is planned to execute or roll back.
+        /// </summary>
+        public bool ShouldExecute { get; private set; }
+        /// <summary>
+        /// Gets the action planned for the package.
+        /// </summary>
+        public ActionState Action { get; private set; }
+        /// <summary>
+        /// Gets or sets the requested MSI property to add.
+        /// </summary>
+        public BURN_MSI_PROPERTY ActionMsiProperty { get; set; }
+        /// <summary>
+        /// Gets or sets the requested internal UI level.
+        /// </summary>
+        public INSTALLUILEVEL UiLevel { get; set; }
+        /// <summary>
+        /// Gets or sets whether Burn is requested to set up an external UI handler.
+        /// </summary>
+        public bool DisableExternalUiHandler { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanPackageComplete"/>
+    /// </summary>
+    [Serializable]
+    public class PlanPackageCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="packageId"></param>
+        /// <param name="hrStatus"></param>
+        /// <param name="requested"></param>
+        public PlanPackageCompleteEventArgs(string packageId, int hrStatus, RequestState requested)
+            : base(hrStatus)
+        {
+            this.PackageId = packageId;
+            this.Requested = requested;
+        }
+        /// <summary>
+        /// Gets the identity of the package planned for.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the requested state for the package.
+        /// </summary>
+        public RequestState Requested { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlannedPackage"/>
+    /// </summary>
+    [Serializable]
+    public class PlannedPackageEventArgs : HResultEventArgs
+    {
+        /// <summary />
+        public PlannedPackageEventArgs(string packageId, ActionState execute, ActionState rollback, bool cache, bool uncache)
+        {
+            this.PackageId = packageId;
+            this.Execute = execute;
+            this.Rollback = rollback;
+            this.Cache = cache;
+            this.Uncache = uncache;
+        }
+        /// <summary>
+        /// Gets the identity of the package planned for.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the planned execution action.
+        /// </summary>
+        public ActionState Execute { get; private set; }
+        /// <summary>
+        /// Gets the planned rollback action.
+        /// </summary>
+        public ActionState Rollback { get; private set; }
+        /// <summary>
+        /// Gets whether the package will be cached.
+        /// </summary>
+        public bool Cache { get; private set; }
+        /// <summary>
+        /// Gets whether the package will be removed from the package cache.
+        /// </summary>
+        public bool Uncache { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments used when the engine has completed planning the installation.
+    /// </summary>
+    [Serializable]
+    public class PlanCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="PlanCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public PlanCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.PlanForwardCompatibleBundle"/>
+    /// </summary>
+    [Serializable]
+    public class PlanForwardCompatibleBundleEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public PlanForwardCompatibleBundleEventArgs(string bundleId, RelationType relationType, string bundleTag, bool perMachine, string version, bool recommendedIgnoreBundle, bool cancelRecommendation, bool ignoreBundle)
+            : base(cancelRecommendation)
+        {
+            this.BundleId = bundleId;
+            this.RelationType = relationType;
+            this.BundleTag = bundleTag;
+            this.PerMachine = perMachine;
+            this.Version = version;
+            this.RecommendedIgnoreBundle = recommendedIgnoreBundle;
+            this.IgnoreBundle = ignoreBundle;
+        }
+        /// <summary>
+        /// Gets the identity of the forward compatible bundle detected.
+        /// </summary>
+        public string BundleId { get; private set; }
+        /// <summary>
+        /// Gets the relationship type of the forward compatible bundle.
+        /// </summary>
+        public RelationType RelationType { get; private set; }
+        /// <summary>
+        /// Gets the tag of the forward compatible bundle.
+        /// </summary>
+        public string BundleTag { get; private set; }
+        /// <summary>
+        /// Gets whether the forward compatible bundle is per machine.
+        /// </summary>
+        public bool PerMachine { get; private set; }
+        /// <summary>
+        /// Gets the version of the forward compatible bundle.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// Gets the recommendation of whether the engine should use the forward compatible bundle.
+        /// </summary>
+        public bool RecommendedIgnoreBundle { get; set; }
+        /// <summary>
+        /// Gets or sets whether the engine will use the forward compatible bundle.
+        /// </summary>
+        public bool IgnoreBundle { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ApplyBegin"/>
+    /// </summary>
+    [Serializable]
+    public class ApplyBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ApplyBeginEventArgs(int phaseCount, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PhaseCount = phaseCount;
+        }
+        /// <summary>
+        /// Gets the number of phases that the engine will go through in apply.
+        /// There are currently two possible phases: cache and execute.
+        /// </summary>
+        public int PhaseCount { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ElevateBegin"/>
+    /// </summary>
+    [Serializable]
+    public class ElevateBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ElevateBeginEventArgs(bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments used when the engine has completed starting the elevated process.
+    /// </summary>
+    [Serializable]
+    public class ElevateCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="ElevateCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public ElevateCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.Progress"/>
+    /// </summary>
+    [Serializable]
+    public class ProgressEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ProgressEventArgs(int progressPercentage, int overallPercentage, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.ProgressPercentage = progressPercentage;
+            this.OverallPercentage = overallPercentage;
+        }
+        /// <summary>
+        /// Gets the percentage from 0 to 100 completed for a package.
+        /// </summary>
+        public int ProgressPercentage { get; private set; }
+        /// <summary>
+        /// Gets the percentage from 0 to 100 completed for the bundle.
+        /// </summary>
+        public int OverallPercentage { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.Error"/>
+    /// </summary>
+    [Serializable]
+    public class ErrorEventArgs : ResultEventArgs
+    {
+        /// <summary />
+        public ErrorEventArgs(ErrorType errorType, string packageId, int errorCode, string errorMessage, int dwUIHint, string[] data, Result recommendation, Result result)
+            : base(recommendation, result)
+        {
+            this.ErrorType = errorType;
+            this.PackageId = packageId;
+            this.ErrorCode = errorCode;
+            this.ErrorMessage = errorMessage;
+            this.UIHint = dwUIHint;
+            this.Data = new ReadOnlyCollection<string>(data ?? new string[] { });
+        }
+        /// <summary>
+        /// Gets the type of error that occurred.
+        /// </summary>
+        public ErrorType ErrorType { get; private set; }
+        /// <summary>
+        /// Gets the identity of the package that yielded the error.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the error code.
+        /// </summary>
+        public int ErrorCode { get; private set; }
+        /// <summary>
+        /// Gets the error message.
+        /// </summary>
+        public string ErrorMessage { get; private set; }
+        /// <summary>
+        /// Gets the recommended display flags for an error dialog.
+        /// </summary>
+        public int UIHint { get; private set; }
+        /// <summary>
+        /// Gets the extended data for the error.
+        /// </summary>
+        public IList<string> Data { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.RegisterBegin"/>
+    /// </summary>
+    [Serializable]
+    public class RegisterBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public RegisterBeginEventArgs(bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments used when the engine has completed registering the location and visilibity of the bundle.
+    /// </summary>
+    [Serializable]
+    public class RegisterCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="RegisterCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public RegisterCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.UnregisterBegin"/>
+    /// </summary>
+    [Serializable]
+    public class UnregisterBeginEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="keepRegistration"></param>
+        /// <param name="forceKeepRegistration"></param>
+        public UnregisterBeginEventArgs(bool keepRegistration, bool forceKeepRegistration)
+        {
+            this.KeepRegistration = keepRegistration;
+            this.ForceKeepRegistration = forceKeepRegistration;
+        }
+        /// <summary>
+        /// Indicates whether the engine will uninstall the bundle.
+        /// </summary>
+        public bool ForceKeepRegistration { get; set; }
+        /// <summary>
+        /// If <see cref="KeepRegistration"/> is FALSE, then this can be set to TRUE to make the engine keep the bundle installed.
+        /// </summary>
+        public bool KeepRegistration { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.UnregisterComplete"/>
+    /// </summary>
+    [Serializable]
+    public class UnregisterCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        public UnregisterCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CacheBegin"/>
+    /// </summary>
+    [Serializable]
+    public class CacheBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CacheBeginEventArgs(bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheAcquireBegin"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheAcquireBeginEventArgs : CancellableActionEventArgs<CacheOperation>
+    {
+        /// <summary />
+        public CacheAcquireBeginEventArgs(string packageOrContainerId, string payloadId, string source, string downloadUrl, string payloadContainerId, CacheOperation recommendation, CacheOperation action, bool cancelRecommendation)
+            : base(cancelRecommendation, recommendation, action)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+            this.Source = source;
+            this.DownloadUrl = downloadUrl;
+            this.PayloadContainerId = payloadContainerId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload (if acquiring a payload).
+        /// </summary>
+        public string PayloadId { get; private set; }
+        /// <summary>
+        /// Gets the source of the container or payload.
+        /// </summary>
+        public string Source { get; private set; }
+        /// <summary>
+        /// Gets the optional URL to download container or payload.
+        /// </summary>
+        public string DownloadUrl { get; private set; }
+        /// <summary>
+        /// Gets the optional identity of the container that contains the payload being acquired.
+        /// </summary>
+        public string PayloadContainerId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheAcquireProgress"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheAcquireProgressEventArgs : CacheProgressBaseEventArgs
+    {
+        /// <summary />
+        public CacheAcquireProgressEventArgs(string packageOrContainerId, string payloadId, long progress, long total, int overallPercentage, bool cancelRecommendation)
+            : base(packageOrContainerId, payloadId, progress, total, overallPercentage, cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheAcquireComplete"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheAcquireCompleteEventArgs : ActionEventArgs<BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION>
+    {
+        /// <summary />
+        public CacheAcquireCompleteEventArgs(string packageOrContainerId, string payloadId, int hrStatus, BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION recommendation, BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION action)
+            : base(hrStatus, recommendation, action)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload (if acquiring a payload).
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheVerifyBegin"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheVerifyBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CacheVerifyBeginEventArgs(string packageOrContainerId, string payloadId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheVerifyProgress"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheVerifyProgressEventArgs : CacheProgressBaseEventArgs
+    {
+        /// <summary />
+        public CacheVerifyProgressEventArgs(string packageOrContainerId, string payloadId, long progress, long total, int overallPercentage, CacheVerifyStep verifyStep, bool cancelRecommendation)
+            : base(packageOrContainerId, payloadId, progress, total, overallPercentage, cancelRecommendation)
+        {
+            this.Step = verifyStep;
+        }
+        /// <summary>
+        /// Gets the current verification step.
+        /// </summary>
+        public CacheVerifyStep Step { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CacheVerifyComplete"/>
+    /// </summary>
+    [Serializable]
+    public class CacheVerifyCompleteEventArgs : ActionEventArgs<BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION>
+    {
+        /// <summary />
+        public CacheVerifyCompleteEventArgs(string packageOrContainerId, string payloadId, int hrStatus, BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION recommendation, BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION action)
+            : base(hrStatus, recommendation, action)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments used after the engine has cached the installation sources.
+    /// </summary>
+    [Serializable]
+    public class CacheCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="CacheCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public CacheCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecuteBegin"/>
+    /// </summary>
+    [Serializable]
+    public class ExecuteBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ExecuteBeginEventArgs(int packageCount, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageCount = packageCount;
+        }
+        /// <summary>
+        /// Gets the number of packages to act on.
+        /// </summary>
+        public int PackageCount { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecutePackageBegin"/>
+    /// </summary>
+    [Serializable]
+    public class ExecutePackageBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ExecutePackageBeginEventArgs(string packageId, bool shouldExecute, ActionState action, INSTALLUILEVEL uiLevel, bool disableExternalUiHandler, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ShouldExecute = shouldExecute;
+            this.Action = action;
+            this.UiLevel = uiLevel;
+            this.DisableExternalUiHandler = disableExternalUiHandler;
+        }
+        /// <summary>
+        /// Gets the identity of the package to act on.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets whether the package is being executed or rolled back.
+        /// </summary>
+        public bool ShouldExecute { get; private set; }
+        /// <summary>
+        /// Gets the action about to be executed.
+        /// </summary>
+        public ActionState Action { get; private set; }
+        /// <summary>
+        /// Gets the internal UI level (if this is an MSI or MSP package).
+        /// </summary>
+        public INSTALLUILEVEL UiLevel { get; private set; }
+        /// <summary>
+        /// Gets whether Burn will set up an external UI handler (if this is an MSI or MSP package).
+        /// </summary>
+        public bool DisableExternalUiHandler { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecutePatchTarget"/>
+    /// </summary>
+    [Serializable]
+    public class ExecutePatchTargetEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ExecutePatchTargetEventArgs(string packageId, string targetProductCode, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.TargetProductCode = targetProductCode;
+        }
+        /// <summary>
+        /// Gets the identity of the package to act on.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the product code being targeted.
+        /// </summary>
+        public string TargetProductCode { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecuteMsiMessage"/>
+    /// </summary>
+    [Serializable]
+    public class ExecuteMsiMessageEventArgs : ResultEventArgs
+    {
+        /// <summary />
+        public ExecuteMsiMessageEventArgs(string packageId, InstallMessage messageType, int dwUIHint, string message, string[] data, Result recommendation, Result result)
+            : base(recommendation, result)
+        {
+            this.PackageId = packageId;
+            this.MessageType = messageType;
+            this.UIHint = dwUIHint;
+            this.Message = message;
+            this.Data = new ReadOnlyCollection<string>(data ?? new string[] { });
+        }
+        /// <summary>
+        /// Gets the identity of the package that yielded this message.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the type of this message.
+        /// </summary>
+        public InstallMessage MessageType { get; private set; }
+        /// <summary>
+        /// Gets the recommended display flags for this message.
+        /// </summary>
+        public int UIHint { get; private set; }
+        /// <summary>
+        /// Gets the message.
+        /// </summary>
+        public string Message { get; private set; }
+        /// <summary>
+        /// Gets the extended data for the message.
+        /// </summary>
+        public IList<string> Data { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecuteFilesInUse"/>
+    /// </summary>
+    [Serializable]
+    public class ExecuteFilesInUseEventArgs : ResultEventArgs
+    {
+        /// <summary />
+        public ExecuteFilesInUseEventArgs(string packageId, string[] files, Result recommendation, Result result)
+            : base(recommendation, result)
+        {
+            this.PackageId = packageId;
+            this.Files = new ReadOnlyCollection<string>(files ?? new string[] { });
+        }
+        /// <summary>
+        /// Gets the identity of the package that yielded the files in use message.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the list of files in use.
+        /// </summary>
+        public IList<string> Files { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecutePackageComplete"/>
+    /// Additional arguments used when the engine has completed installing a specific package.
+    /// </summary>
+    [Serializable]
+    public class ExecutePackageCompleteEventArgs : ActionEventArgs<BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION>
+    {
+        /// <summary />
+        public ExecutePackageCompleteEventArgs(string packageId, int hrStatus, ApplyRestart restart, BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION recommendation, BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION action)
+            : base(hrStatus, recommendation, action)
+        {
+            this.PackageId = packageId;
+            this.Restart = restart;
+        }
+        /// <summary>
+        /// Gets the identity of the package that was acted on.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the package restart state after being applied.
+        /// </summary>
+        public ApplyRestart Restart { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments used when the engine has completed installing packages.
+    /// </summary>
+    [Serializable]
+    public class ExecuteCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// Creates a new instance of the <see cref="ExecuteCompleteEventArgs"/> class.
+        /// </summary>
+        /// <param name="hrStatus">The return code of the operation.</param>
+        public ExecuteCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ApplyComplete"/>
+    /// </summary>
+    [Serializable]
+    public class ApplyCompleteEventArgs : ActionEventArgs<BOOTSTRAPPER_APPLYCOMPLETE_ACTION>
+    {
+        /// <summary />
+        public ApplyCompleteEventArgs(int hrStatus, ApplyRestart restart, BOOTSTRAPPER_APPLYCOMPLETE_ACTION recommendation, BOOTSTRAPPER_APPLYCOMPLETE_ACTION action)
+            : base(hrStatus, recommendation, action)
+        {
+            this.Restart = restart;
+        }
+        /// <summary>
+        /// Gets the apply restart state when complete.
+        /// </summary>
+        public ApplyRestart Restart { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheAcquireResolving"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheAcquireResolvingEventArgs : CancellableActionEventArgs<CacheResolveOperation>
+    {
+        /// <summary />
+        public CacheAcquireResolvingEventArgs(string packageOrContainerId, string payloadId, string[] searchPaths, bool foundLocal, int recommendedSearchPath, string downloadUrl, string payloadContainerId, CacheResolveOperation recommendation, int chosenSearchPath, CacheResolveOperation action, bool cancel)
+            : base(cancel, recommendation, action)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+            this.SearchPaths = searchPaths;
+            this.FoundLocal = foundLocal;
+            this.RecommendedSearchPath = recommendedSearchPath;
+            this.DownloadUrl = downloadUrl;
+            this.PayloadContainerId = payloadContainerId;
+            this.ChosenSearchPath = chosenSearchPath;
+        }
+        /// <summary>
+        /// Gets the identity of the package or container that is being acquired.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identity of the payload that is being acquired.
+        /// </summary>
+        public string PayloadId { get; private set; }
+        /// <summary>
+        /// Gets the search paths used for source resolution.
+        /// </summary>
+        public string[] SearchPaths { get; private set; }
+        /// <summary>
+        /// Gets whether <see cref="RecommendedSearchPath"/> indicates that a file was found at that search path.
+        /// </summary>
+        public bool FoundLocal { get; private set; }
+        /// <summary>
+        /// When <see cref="FoundLocal"/> is true, the index to <see cref="SearchPaths"/> for the recommended local file.
+        /// </summary>
+        public int RecommendedSearchPath { get; private set; }
+        /// <summary>
+        /// Gets the optional URL to download container or payload.
+        /// </summary>
+        public string DownloadUrl { get; private set; }
+        /// <summary>
+        /// Gets the optional identity of the container that contains the payload being acquired.
+        /// </summary>
+        public string PayloadContainerId { get; private set; }
+        /// <summary>
+        /// Gets or sets the index to <see cref="SearchPaths"/> to use when <see cref="CancellableActionEventArgs{T}.Action"/> is set to <see cref="CacheOperation.Copy"/>.
+        /// </summary>
+        public int ChosenSearchPath { get; set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CachePackageBegin"/>
+    /// </summary>
+    [Serializable]
+    public class CachePackageBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CachePackageBeginEventArgs(string packageId, int cachePayloads, long packageCacheSize, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.CachePayloads = cachePayloads;
+            this.PackageCacheSize = packageCacheSize;
+        }
+        /// <summary>
+        /// Gets the identity of the package that is being cached.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets number of payloads to be cached.
+        /// </summary>
+        public long CachePayloads { get; private set; }
+        /// <summary>
+        /// Gets the size on disk required by the specific package.
+        /// </summary>
+        public long PackageCacheSize { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CachePackageComplete"/>
+    /// </summary>
+    [Serializable]
+    public class CachePackageCompleteEventArgs : ActionEventArgs<BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION>
+    {
+        /// <summary />
+        public CachePackageCompleteEventArgs(string packageId, int hrStatus, BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION recommendation, BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION action)
+            : base(hrStatus, recommendation, action)
+        {
+            this.PackageId = packageId;
+        }
+        /// <summary>
+        /// Gets the identity of the package that was cached.
+        /// </summary>
+        public string PackageId { get; private set; }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.ExecuteProgress"/>
+    /// </summary>
+    [Serializable]
+    public class ExecuteProgressEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public ExecuteProgressEventArgs(string packageId, int progressPercentage, int overallPercentage, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageId = packageId;
+            this.ProgressPercentage = progressPercentage;
+            this.OverallPercentage = overallPercentage;
+        }
+        /// <summary>
+        /// Gets the identity of the package that was executed.
+        /// </summary>
+        public string PackageId { get; private set; }
+        /// <summary>
+        /// Gets the percentage from 0 to 100 of the execution progress for a single payload.
+        /// </summary>
+        public int ProgressPercentage { get; private set; }
+        /// <summary>
+        /// Gets the percentage from 0 to 100 of the execution progress for all payloads.
+        /// </summary>
+        public int OverallPercentage { get; private set; }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before it tries to launch the preapproved executable.
+    /// </summary>
+    [Serializable]
+    public class LaunchApprovedExeBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="cancelRecommendation"></param>
+        public LaunchApprovedExeBeginEventArgs(bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after it finished trying to launch the preapproved executable.
+    /// </summary>
+    [Serializable]
+    public class LaunchApprovedExeCompleteEventArgs : StatusEventArgs
+    {
+        private int processId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <param name="processId"></param>
+        public LaunchApprovedExeCompleteEventArgs(int hrStatus, int processId)
+            : base(hrStatus)
+        {
+            this.processId = processId;
+        }
+        /// <summary>
+        /// Gets the ProcessId of the process that was launched.
+        /// This is only valid if the status reports success.
+        /// </summary>
+        public int ProcessId
+        {
+            get { return this.processId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before beginning an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class BeginMsiTransactionBeginEventArgs : CancellableHResultEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        /// <param name="cancelRecommendation"></param>
+        public BeginMsiTransactionBeginEventArgs(string transactionId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after beginning an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class BeginMsiTransactionCompleteEventArgs : StatusEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        /// <param name="hrStatus"></param>
+        public BeginMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
+            : base(hrStatus)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before committing an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class CommitMsiTransactionBeginEventArgs : CancellableHResultEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        /// <param name="cancelRecommendation"></param>
+        public CommitMsiTransactionBeginEventArgs(string transactionId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after committing an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class CommitMsiTransactionCompleteEventArgs : StatusEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        /// <param name="hrStatus"></param>
+        public CommitMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
+            : base(hrStatus)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before rolling back an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class RollbackMsiTransactionBeginEventArgs : HResultEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        public RollbackMsiTransactionBeginEventArgs(string transactionId)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after rolling back an MSI transaction.
+    /// </summary>
+    [Serializable]
+    public class RollbackMsiTransactionCompleteEventArgs : StatusEventArgs
+    {
+        private string transactionId;
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="transactionId"></param>
+        /// <param name="hrStatus"></param>
+        public RollbackMsiTransactionCompleteEventArgs(string transactionId, int hrStatus)
+            : base(hrStatus)
+        {
+            this.transactionId = transactionId;
+        }
+        /// <summary>
+        /// Gets the MSI transaction Id.
+        /// </summary>
+        public string TransactionId
+        {
+            get { return this.transactionId; }
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before pausing Windows automatic updates.
+    /// </summary>
+    [Serializable]
+    public class PauseAutomaticUpdatesBeginEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public PauseAutomaticUpdatesBeginEventArgs()
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after pausing Windows automatic updates.
+    /// </summary>
+    [Serializable]
+    public class PauseAutomaticUpdatesCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        public PauseAutomaticUpdatesCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine before taking a system restore point.
+    /// </summary>
+    [Serializable]
+    public class SystemRestorePointBeginEventArgs : HResultEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        public SystemRestorePointBeginEventArgs()
+        {
+        }
+    }
+    /// <summary>
+    /// Additional arguments passed by the engine after taking a system restore point.
+    /// </summary>
+    [Serializable]
+    public class SystemRestorePointCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        public SystemRestorePointCompleteEventArgs(int hrStatus)
+            : base(hrStatus)
+        {
+        }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyBegin"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheContainerOrPayloadVerifyBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CacheContainerOrPayloadVerifyBeginEventArgs(string packageOrContainerId, string payloadId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyProgress"/>.
+    /// </summary>
+    [Serializable]
+    public class CacheContainerOrPayloadVerifyProgressEventArgs : CacheProgressBaseEventArgs
+    {
+        /// <summary />
+        public CacheContainerOrPayloadVerifyProgressEventArgs(string packageOrContainerId, string payloadId, long progress, long total, int overallPercentage, bool cancelRecommendation)
+            : base(packageOrContainerId, payloadId, progress, total, overallPercentage, cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyComplete"/>
+    /// </summary>
+    [Serializable]
+    public class CacheContainerOrPayloadVerifyCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary />
+        public CacheContainerOrPayloadVerifyCompleteEventArgs(string packageOrContainerId, string payloadId, int hrStatus)
+            : base(hrStatus)
+        {
+            this.PackageOrContainerId = packageOrContainerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container or package.
+        /// </summary>
+        public string PackageOrContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CachePayloadExtractBegin"/>.
+    /// </summary>
+    [Serializable]
+    public class CachePayloadExtractBeginEventArgs : CancellableHResultEventArgs
+    {
+        /// <summary />
+        public CachePayloadExtractBeginEventArgs(string containerId, string payloadId, bool cancelRecommendation)
+            : base(cancelRecommendation)
+        {
+            this.ContainerId = containerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container.
+        /// </summary>
+        public string ContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+    /// <summary>
+    /// EventArgs for <see cref="IDefaultBootstrapperApplication.CachePayloadExtractProgress"/>.
+    /// </summary>
+    [Serializable]
+    public class CachePayloadExtractProgressEventArgs : CacheProgressBaseEventArgs
+    {
+        /// <summary />
+        public CachePayloadExtractProgressEventArgs(string containerId, string payloadId, long progress, long total, int overallPercentage, bool cancelRecommendation)
+            : base(containerId, payloadId, progress, total, overallPercentage, cancelRecommendation)
+        {
+        }
+    }
+    /// <summary>
+    /// Event arguments for <see cref="IDefaultBootstrapperApplication.CachePayloadExtractComplete"/>
+    /// </summary>
+    [Serializable]
+    public class CachePayloadExtractCompleteEventArgs : StatusEventArgs
+    {
+        /// <summary />
+        public CachePayloadExtractCompleteEventArgs(string containerId, string payloadId, int hrStatus)
+            : base(hrStatus)
+        {
+            this.ContainerId = containerId;
+            this.PayloadId = payloadId;
+        }
+        /// <summary>
+        /// Gets the identifier of the container.
+        /// </summary>
+        public string ContainerId { get; private set; }
+        /// <summary>
+        /// Gets the identifier of the payload.
+        /// </summary>
+        public string PayloadId { get; private set; }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs
new file mode 100644
index 00000000..530fb1a9
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplication.cs
@@ -0,0 +1,1917 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// Allows customization of the bootstrapper application.
+    /// </summary>
+    [ComImport]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    [Guid("53C31D56-49C0-426B-AB06-099D717C67FE")]
+    public interface IBootstrapperApplication
+    {
+        /// <summary>
+        /// Low level method that is called directly from the engine.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int BAProc(
+            int message,
+            IntPtr pvArgs,
+            IntPtr pvResults,
+            IntPtr pvContext
+            );
+        /// <summary>
+        /// Low level method that is called directly from the engine.
+        /// </summary>
+        void BAProcFallback(
+            int message,
+            IntPtr pvArgs,
+            IntPtr pvResults,
+            ref int phr,
+            IntPtr pvContext
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.Startup"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnStartup();
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.Shutdown"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnShutdown(ref BOOTSTRAPPER_SHUTDOWN_ACTION action);
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.SystemShutdown"/>.
+        /// </summary>
+        /// <param name="dwEndSession"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnSystemShutdown(
+            [MarshalAs(UnmanagedType.U4)] EndSessionReasons dwEndSession,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectBegin(
+            [MarshalAs(UnmanagedType.Bool)] bool fCached,
+            [MarshalAs(UnmanagedType.Bool)] bool fInstalled,
+            [MarshalAs(UnmanagedType.U4)] int cPackages,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectForwardCompatibleBundle"/>.
+        /// </summary>
+        /// <param name="wzBundleId"></param>
+        /// <param name="relationType"></param>
+        /// <param name="wzBundleTag"></param>
+        /// <param name="fPerMachine"></param>
+        /// <param name="wzVersion"></param>
+        /// <param name="fMissingFromCache"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectForwardCompatibleBundle(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleId,
+            [MarshalAs(UnmanagedType.U4)] RelationType relationType,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleTag,
+            [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.Bool)] bool fMissingFromCache,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectUpdateBegin"/>.
+        /// </summary>
+        /// <param name="wzUpdateLocation"></param>
+        /// <param name="fCancel"></param>
+        /// <param name="fSkip"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectUpdateBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzUpdateLocation,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fSkip
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectUpdate"/>.
+        /// </summary>
+        /// <param name="wzUpdateLocation"></param>
+        /// <param name="dw64Size"></param>
+        /// <param name="wzVersion"></param>
+        /// <param name="wzTitle"></param>
+        /// <param name="wzSummary"></param>
+        /// <param name="wzContentType"></param>
+        /// <param name="wzContent"></param>
+        /// <param name="fCancel"></param>
+        /// <param name="fStopProcessingUpdates"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectUpdate(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzUpdateLocation,
+            [MarshalAs(UnmanagedType.U8)] long dw64Size,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTitle,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzSummary,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzContentType,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzContent,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fStopProcessingUpdates
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectUpdateComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <param name="fIgnoreError"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectUpdateComplete(
+            int hrStatus,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fIgnoreError
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectRelatedBundle"/>.
+        /// </summary>
+        /// <param name="wzBundleId"></param>
+        /// <param name="relationType"></param>
+        /// <param name="wzBundleTag"></param>
+        /// <param name="fPerMachine"></param>
+        /// <param name="wzVersion"></param>
+        /// <param name="operation"></param>
+        /// <param name="fMissingFromCache"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectRelatedBundle(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleId,
+            [MarshalAs(UnmanagedType.U4)] RelationType relationType,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleTag,
+            [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.U4)] RelatedOperation operation,
+            [MarshalAs(UnmanagedType.Bool)] bool fMissingFromCache,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectPackageBegin"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectPackageBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectRelatedMsiPackage"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzUpgradeCode"></param>
+        /// <param name="wzProductCode"></param>
+        /// <param name="fPerMachine"></param>
+        /// <param name="wzVersion"></param>
+        /// <param name="operation"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectRelatedMsiPackage(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzUpgradeCode,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzProductCode,
+            [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.U4)] RelatedOperation operation,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectPatchTarget"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzProductCode"></param>
+        /// <param name="patchState"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectPatchTarget(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzProductCode,
+            [MarshalAs(UnmanagedType.U4)] PackageState patchState,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectMsiFeature"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzFeatureId"></param>
+        /// <param name="state"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectMsiFeature(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzFeatureId,
+            [MarshalAs(UnmanagedType.U4)] FeatureState state,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectPackageComplete"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectPackageComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            int hrStatus,
+            [MarshalAs(UnmanagedType.U4)] PackageState state,
+            [MarshalAs(UnmanagedType.Bool)] bool fCached
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.DetectComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <param name="fEligibleForCleanup"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnDetectComplete(
+            int hrStatus,
+            [MarshalAs(UnmanagedType.Bool)] bool fEligibleForCleanup
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanBegin"/>.
+        /// </summary>
+        /// <param name="cPackages"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanBegin(
+            [MarshalAs(UnmanagedType.U4)] int cPackages,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanRelatedBundle"/>.
+        /// </summary>
+        /// <param name="wzBundleId"></param>
+        /// <param name="recommendedState"></param>
+        /// <param name="pRequestedState"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanRelatedBundle(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleId,
+            [MarshalAs(UnmanagedType.U4)] RequestState recommendedState,
+            [MarshalAs(UnmanagedType.U4)] ref RequestState pRequestedState,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanPackageBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanPackageBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] PackageState state,
+            [MarshalAs(UnmanagedType.Bool)] bool fCached,
+            [MarshalAs(UnmanagedType.U4)] BOOTSTRAPPER_PACKAGE_CONDITION_RESULT installCondition,
+            [MarshalAs(UnmanagedType.U4)] RequestState recommendedState,
+            [MarshalAs(UnmanagedType.U4)] BOOTSTRAPPER_CACHE_TYPE recommendedCacheType,
+            [MarshalAs(UnmanagedType.U4)] ref RequestState pRequestedState,
+            [MarshalAs(UnmanagedType.U4)] ref BOOTSTRAPPER_CACHE_TYPE pRequestedCacheType,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanPatchTarget"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzProductCode"></param>
+        /// <param name="recommendedState"></param>
+        /// <param name="pRequestedState"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanPatchTarget(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzProductCode,
+            [MarshalAs(UnmanagedType.U4)] RequestState recommendedState,
+            [MarshalAs(UnmanagedType.U4)] ref RequestState pRequestedState,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanMsiFeature"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzFeatureId"></param>
+        /// <param name="recommendedState"></param>
+        /// <param name="pRequestedState"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanMsiFeature(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzFeatureId,
+            [MarshalAs(UnmanagedType.U4)] FeatureState recommendedState,
+            [MarshalAs(UnmanagedType.U4)] ref FeatureState pRequestedState,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanMsiPackage"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="fExecute"></param>
+        /// <param name="action"></param>
+        /// <param name="fCancel"></param>
+        /// <param name="actionMsiProperty"></param>
+        /// <param name="uiLevel"></param>
+        /// <param name="fDisableExternalUiHandler"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanMsiPackage(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.Bool)] bool fExecute,
+            [MarshalAs(UnmanagedType.U4)] ActionState action,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel,
+            [MarshalAs(UnmanagedType.U4)] ref BURN_MSI_PROPERTY actionMsiProperty,
+            [MarshalAs(UnmanagedType.U4)] ref INSTALLUILEVEL uiLevel,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fDisableExternalUiHandler
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanPackageComplete"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="hrStatus"></param>
+        /// <param name="requested"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanPackageComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            int hrStatus,
+            [MarshalAs(UnmanagedType.U4)] RequestState requested
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlannedPackage"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlannedPackage(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] ActionState execute,
+            [MarshalAs(UnmanagedType.U4)] ActionState rollback,
+            [MarshalAs(UnmanagedType.Bool)] bool fPlannedCache,
+            [MarshalAs(UnmanagedType.Bool)] bool fPlannedUncache
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ApplyBegin"/>.
+        /// </summary>
+        /// <param name="dwPhaseCount"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnApplyBegin(
+            [MarshalAs(UnmanagedType.U4)] int dwPhaseCount,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ElevateBegin"/>.
+        /// </summary>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnElevateBegin(
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ElevateComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnElevateComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.Progress"/>.
+        /// </summary>
+        /// <param name="dwProgressPercentage"></param>
+        /// <param name="dwOverallPercentage"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnProgress(
+            [MarshalAs(UnmanagedType.U4)] int dwProgressPercentage,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.Error"/>.
+        /// </summary>
+        /// <param name="errorType"></param>
+        /// <param name="wzPackageId"></param>
+        /// <param name="dwCode"></param>
+        /// <param name="wzError"></param>
+        /// <param name="dwUIHint"></param>
+        /// <param name="cData"></param>
+        /// <param name="rgwzData"></param>
+        /// <param name="nRecommendation"></param>
+        /// <param name="pResult"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnError(
+            [MarshalAs(UnmanagedType.U4)] ErrorType errorType,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] int dwCode,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzError,
+            [MarshalAs(UnmanagedType.I4)] int dwUIHint,
+            [MarshalAs(UnmanagedType.U4)] int cData,
+            [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 5, ArraySubType = UnmanagedType.LPWStr), In] string[] rgwzData,
+            [MarshalAs(UnmanagedType.I4)] Result nRecommendation,
+            [MarshalAs(UnmanagedType.I4)] ref Result pResult
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.RegisterBegin"/>.
+        /// </summary>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnRegisterBegin(
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.RegisterComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnRegisterComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheBegin"/>.
+        /// </summary>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheBegin(
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CachePackageBegin"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="cCachePayloads"></param>
+        /// <param name="dw64PackageCacheSize"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCachePackageBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] int cCachePayloads,
+            [MarshalAs(UnmanagedType.U8)] long dw64PackageCacheSize,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheAcquireBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheAcquireBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzSource,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzDownloadUrl,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadContainerId,
+            [MarshalAs(UnmanagedType.U4)] CacheOperation recommendation,
+            [MarshalAs(UnmanagedType.I4)] ref CacheOperation action,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheAcquireProgress"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheAcquireProgress(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.U8)] long dw64Progress,
+            [MarshalAs(UnmanagedType.U8)] long dw64Total,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheAcquireResolving"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheAcquireResolving(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 3, ArraySubType = UnmanagedType.LPWStr), In] string[] searchPaths,
+            [MarshalAs(UnmanagedType.U4)] int cSearchPaths,
+            [MarshalAs(UnmanagedType.Bool)] bool fFoundLocal,
+            [MarshalAs(UnmanagedType.U4)] int dwRecommendedSearchPath,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzDownloadUrl,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadContainerId,
+            [MarshalAs(UnmanagedType.I4)] CacheResolveOperation recommendation,
+            [MarshalAs(UnmanagedType.U4)] ref int dwChosenSearchPath,
+            [MarshalAs(UnmanagedType.I4)] ref CacheResolveOperation action,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheAcquireComplete"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheAcquireComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            int hrStatus,
+            BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION recommendation,
+            ref BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION pAction
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheVerifyBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheVerifyBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheVerifyProgress"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheVerifyProgress(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.U8)] long dw64Progress,
+            [MarshalAs(UnmanagedType.U8)] long dw64Total,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.I4)] CacheVerifyStep verifyStep,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheVerifyComplete"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheVerifyComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            int hrStatus,
+            BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION recommendation,
+            ref BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION action
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CachePackageComplete"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="hrStatus"></param>
+        /// <param name="recommendation"></param>
+        /// <param name="action"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCachePackageComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            int hrStatus,
+            BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION recommendation,
+            ref BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION action
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecuteBegin"/>.
+        /// </summary>
+        /// <param name="cExecutingPackages"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecuteBegin(
+            [MarshalAs(UnmanagedType.U4)] int cExecutingPackages,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecutePackageBegin"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="fExecute"></param>
+        /// <param name="action"></param>
+        /// <param name="uiLevel"></param>
+        /// <param name="fDisableExternalUiHandler"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecutePackageBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.Bool)] bool fExecute,
+            [MarshalAs(UnmanagedType.U4)] ActionState action,
+            [MarshalAs(UnmanagedType.U4)] INSTALLUILEVEL uiLevel,
+            [MarshalAs(UnmanagedType.Bool)] bool fDisableExternalUiHandler,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecutePatchTarget"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="wzTargetProductCode"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecutePatchTarget(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTargetProductCode,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecuteProgress"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="dwProgressPercentage"></param>
+        /// <param name="dwOverallPercentage"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecuteProgress(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] int dwProgressPercentage,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecuteMsiMessage"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="messageType"></param>
+        /// <param name="dwUIHint"></param>
+        /// <param name="wzMessage"></param>
+        /// <param name="cData"></param>
+        /// <param name="rgwzData"></param>
+        /// <param name="nRecommendation"></param>
+        /// <param name="pResult"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecuteMsiMessage(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] InstallMessage messageType,
+            [MarshalAs(UnmanagedType.I4)] int dwUIHint,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzMessage,
+            [MarshalAs(UnmanagedType.U4)] int cData,
+            [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 4, ArraySubType = UnmanagedType.LPWStr), In] string[] rgwzData,
+            [MarshalAs(UnmanagedType.I4)] Result nRecommendation,
+            [MarshalAs(UnmanagedType.I4)] ref Result pResult
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecuteFilesInUse"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="cFiles"></param>
+        /// <param name="rgwzFiles"></param>
+        /// <param name="nRecommendation"></param>
+        /// <param name="pResult"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecuteFilesInUse(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.U4)] int cFiles,
+            [MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1, ArraySubType = UnmanagedType.LPWStr), In] string[] rgwzFiles,
+            [MarshalAs(UnmanagedType.I4)] Result nRecommendation,
+            [MarshalAs(UnmanagedType.I4)] ref Result pResult
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecutePackageComplete"/>.
+        /// </summary>
+        /// <param name="wzPackageId"></param>
+        /// <param name="hrStatus"></param>
+        /// <param name="restart"></param>
+        /// <param name="recommendation"></param>
+        /// <param name="pAction"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecutePackageComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            int hrStatus,
+            [MarshalAs(UnmanagedType.U4)] ApplyRestart restart,
+            [MarshalAs(UnmanagedType.I4)] BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION recommendation,
+            [MarshalAs(UnmanagedType.I4)] ref BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION pAction
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ExecuteComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnExecuteComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.UnregisterBegin"/>.
+        /// </summary>
+        /// <param name="fKeepRegistration"></param>
+        /// <param name="fForceKeepRegistration"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnUnregisterBegin(
+            [MarshalAs(UnmanagedType.Bool)] bool fKeepRegistration,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fForceKeepRegistration
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.UnregisterComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnUnregisterComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.ApplyComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <param name="restart"></param>
+        /// <param name="recommendation"></param>
+        /// <param name="pAction"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnApplyComplete(
+            int hrStatus,
+            [MarshalAs(UnmanagedType.U4)] ApplyRestart restart,
+            [MarshalAs(UnmanagedType.I4)] BOOTSTRAPPER_APPLYCOMPLETE_ACTION recommendation,
+            [MarshalAs(UnmanagedType.I4)] ref BOOTSTRAPPER_APPLYCOMPLETE_ACTION pAction
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.LaunchApprovedExeBegin"/>.
+        /// </summary>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnLaunchApprovedExeBegin(
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.LaunchApprovedExeComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <param name="processId"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnLaunchApprovedExeComplete(
+            int hrStatus,
+            int processId
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.BeginMsiTransactionBegin"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnBeginMsiTransactionBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.BeginMsiTransactionComplete"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnBeginMsiTransactionComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId,
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CommitMsiTransactionBegin"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <param name="fCancel"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCommitMsiTransactionBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CommitMsiTransactionComplete"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCommitMsiTransactionComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId,
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.RollbackMsiTransactionBegin"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnRollbackMsiTransactionBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.RollbackMsiTransactionComplete"/>.
+        /// </summary>
+        /// <param name="wzTransactionId"></param>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnRollbackMsiTransactionComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzTransactionId,
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PauseAutomaticUpdatesBegin"/>.
+        /// </summary>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPauseAutomaticUpdatesBegin(
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PauseAutomaticUpdatesComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPauseAutomaticUpdatesComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.SystemRestorePointBegin"/>.
+        /// </summary>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnSystemRestorePointBegin(
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.SystemRestorePointComplete"/>.
+        /// </summary>
+        /// <param name="hrStatus"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnSystemRestorePointComplete(
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.PlanForwardCompatibleBundle"/>.
+        /// </summary>
+        /// <param name="wzBundleId"></param>
+        /// <param name="relationType"></param>
+        /// <param name="wzBundleTag"></param>
+        /// <param name="fPerMachine"></param>
+        /// <param name="wzVersion"></param>
+        /// <param name="fRecommendedIgnoreBundle"></param>
+        /// <param name="fCancel"></param>
+        /// <param name="fIgnoreBundle"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnPlanForwardCompatibleBundle(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleId,
+            [MarshalAs(UnmanagedType.U4)] RelationType relationType,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzBundleTag,
+            [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.Bool)] bool fRecommendedIgnoreBundle,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fIgnoreBundle
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheContainerOrPayloadVerifyBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyProgress"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheContainerOrPayloadVerifyProgress(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.U8)] long dw64Progress,
+            [MarshalAs(UnmanagedType.U8)] long dw64Total,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CacheContainerOrPayloadVerifyComplete"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCacheContainerOrPayloadVerifyComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            int hrStatus
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CachePayloadExtractBegin"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCachePayloadExtractBegin(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CachePayloadExtractProgress"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCachePayloadExtractProgress(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.U8)] long dw64Progress,
+            [MarshalAs(UnmanagedType.U8)] long dw64Total,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallPercentage,
+            [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
+            );
+        /// <summary>
+        /// See <see cref="IDefaultBootstrapperApplication.CachePayloadExtractComplete"/>.
+        /// </summary>
+        [PreserveSig]
+        [return: MarshalAs(UnmanagedType.I4)]
+        int OnCachePayloadExtractComplete(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            int hrStatus
+            );
+    }
+    /// <summary>
+    /// The display level for the BA.
+    /// </summary>
+    public enum Display
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Embedded,
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// 
+        /// </summary>
+        Passive,
+        /// <summary>
+        /// 
+        /// </summary>
+        Full,
+    }
+    /// <summary>
+    /// Messages from Windows Installer (msi.h).
+    /// </summary>
+    public enum InstallMessage
+    {
+        /// <summary>
+        /// premature termination, possibly fatal OOM
+        /// </summary>
+        FatalExit,
+        /// <summary>
+        /// formatted error message
+        /// </summary>
+        Error = 0x01000000,
+        /// <summary>
+        /// formatted warning message
+        /// </summary>
+        Warning = 0x02000000,
+        /// <summary>
+        /// user request message
+        /// </summary>
+        User = 0x03000000,
+        /// <summary>
+        /// informative message for log
+        /// </summary>
+        Info = 0x04000000,
+        /// <summary>
+        /// list of files in use that need to be replaced
+        /// </summary>
+        FilesInUse = 0x05000000,
+        /// <summary>
+        /// request to determine a valid source location
+        /// </summary>
+        ResolveSource = 0x06000000,
+        /// <summary>
+        /// insufficient disk space message
+        /// </summary>
+        OutOfDiskSpace = 0x07000000,
+        /// <summary>
+        /// start of action: action name &amp; description
+        /// </summary>
+        ActionStart = 0x08000000,
+        /// <summary>
+        /// formatted data associated with individual action item
+        /// </summary>
+        ActionData = 0x09000000,
+        /// <summary>
+        /// progress gauge info: units so far, total
+        /// </summary>
+        Progress = 0x0a000000,
+        /// <summary>
+        /// product info for dialog: language Id, dialog caption
+        /// </summary>
+        CommonData = 0x0b000000,
+        /// <summary>
+        /// sent prior to UI initialization, no string data
+        /// </summary>
+        Initialize = 0x0c000000,
+        /// <summary>
+        /// sent after UI termination, no string data
+        /// </summary>
+        Terminate = 0x0d000000,
+        /// <summary>
+        /// sent prior to display or authored dialog or wizard
+        /// </summary>
+        ShowDialog = 0x0e000000,
+        /// <summary>
+        /// log only, to log performance number like action time
+        /// </summary>
+        Performance = 0x0f000000,
+        /// <summary>
+        /// the list of apps that the user can request Restart Manager to shut down and restart
+        /// </summary>
+        RMFilesInUse = 0x19000000,
+        /// <summary>
+        /// sent prior to server-side install of a product
+        /// </summary>
+        InstallStart = 0x1a000000,
+        /// <summary>
+        /// sent after server-side install
+        /// </summary>
+        InstallEnd = 0x1B000000,
+    }
+    /// <summary>
+    /// The action to perform when a reboot is necessary.
+    /// </summary>
+    public enum Restart
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Never,
+        /// <summary>
+        /// 
+        /// </summary>
+        Prompt,
+        /// <summary>
+        /// 
+        /// </summary>
+        Automatic,
+        /// <summary>
+        /// 
+        /// </summary>
+        Always,
+    }
+    /// <summary>
+    /// Result codes (based on Dialog Box Command IDs from WinUser.h).
+    /// </summary>
+    public enum Result
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Error = -1,
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// 
+        /// </summary>
+        Ok,
+        /// <summary>
+        /// 
+        /// </summary>
+        Cancel,
+        /// <summary>
+        /// 
+        /// </summary>
+        Abort,
+        /// <summary>
+        /// 
+        /// </summary>
+        Retry,
+        /// <summary>
+        /// 
+        /// </summary>
+        Ignore,
+        /// <summary>
+        /// 
+        /// </summary>
+        Yes,
+        /// <summary>
+        /// 
+        /// </summary>
+        No,
+        /// <summary>
+        /// /
+        /// </summary>
+        Close,
+        /// <summary>
+        /// 
+        /// </summary>
+        Help,
+        /// <summary>
+        /// 
+        /// </summary>
+        TryAgain,
+        /// <summary>
+        /// 
+        /// </summary>
+        Continue,
+    }
+    /// <summary>
+    /// Describes why a bundle or packaged is being resumed.
+    /// </summary>
+    public enum ResumeType
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Resume information exists but is invalid.
+        /// </summary>
+        Invalid,
+        /// <summary>
+        /// The bundle was re-launched after an unexpected interruption.
+        /// </summary>
+        Interrupted,
+        /// <summary>
+        /// A reboot is pending.
+        /// </summary>
+        RebootPending,
+        /// <summary>
+        /// The bundle was re-launched after a reboot.
+        /// </summary>
+        Reboot,
+        /// <summary>
+        /// The bundle was re-launched after being suspended.
+        /// </summary>
+        Suspend,
+        /// <summary>
+        /// The bundle was launched from Add/Remove Programs.
+        /// </summary>
+        Arp,
+    }
+    /// <summary>
+    /// Indicates what caused the error.
+    /// </summary>
+    public enum ErrorType
+    {
+        /// <summary>
+        /// The error occurred trying to elevate.
+        /// </summary>
+        Elevate,
+        /// <summary>
+        /// The error came from the Windows Installer.
+        /// </summary>
+        WindowsInstaller,
+        /// <summary>
+        /// The error came from an EXE Package.
+        /// </summary>
+        ExePackage,
+        /// <summary>
+        /// The error came while trying to authenticate with an HTTP server.
+        /// </summary>
+        HttpServerAuthentication,
+        /// <summary>
+        /// The error came while trying to authenticate with an HTTP proxy.
+        /// </summary>
+        HttpProxyAuthentication,
+        /// <summary>
+        /// The error occurred during apply.
+        /// </summary>
+        Apply,
+    };
+    /// <summary>
+    /// The calculated operation for the related bundle.
+    /// </summary>
+    public enum RelatedOperation
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// The related bundle or package will be downgraded.
+        /// </summary>
+        Downgrade,
+        /// <summary>
+        /// The related package will be upgraded as a minor revision.
+        /// </summary>
+        MinorUpdate,
+        /// <summary>
+        /// The related bundle or package will be upgraded as a major revision.
+        /// </summary>
+        MajorUpgrade,
+        /// <summary>
+        /// The related bundle will be removed.
+        /// </summary>
+        Remove,
+        /// <summary>
+        /// The related bundle will be installed.
+        /// </summary>
+        Install,
+        /// <summary>
+        /// The related bundle will be repaired.
+        /// </summary>
+        Repair,
+    };
+    /// <summary>
+    /// The cache operation used to acquire a container or payload.
+    /// </summary>
+    public enum CacheOperation
+    {
+        /// <summary>
+        /// There is no source available.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Copy the payload or container from the chosen local source.
+        /// </summary>
+        Copy,
+        /// <summary>
+        /// Download the payload or container using the download URL.
+        /// </summary>
+        Download,
+        /// <summary>
+        /// Extract the payload from the container.
+        /// </summary>
+        Extract,
+    }
+    /// <summary>
+    /// The source to be used to acquire a container or payload.
+    /// </summary>
+    public enum CacheResolveOperation
+    {
+        /// <summary>
+        /// There is no source available.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Copy the payload or container from the chosen local source.
+        /// </summary>
+        Local,
+        /// <summary>
+        /// Download the payload or container from the download URL.
+        /// </summary>
+        Download,
+        /// <summary>
+        /// Extract the payload from the container.
+        /// </summary>
+        Container,
+        /// <summary>
+        /// Look again for the payload or container locally.
+        /// </summary>
+        Retry,
+    }
+    /// <summary>
+    /// The current step when verifying a container or payload.
+    /// </summary>
+    public enum CacheVerifyStep
+    {
+        /// <summary>
+        /// Copying or moving the file from the working path to the unverified path.
+        /// Not used during Layout.
+        /// </summary>
+        Stage,
+        /// <summary>
+        /// Hashing the file.
+        /// </summary>
+        Hash,
+        /// <summary>
+        /// Copying or moving the file to the final location.
+        /// </summary>
+        Finalize,
+    }
+    /// <summary>
+    /// The restart state after a package or all packages were applied.
+    /// </summary>
+    public enum ApplyRestart
+    {
+        /// <summary>
+        /// Package or chain does not require a restart.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Package or chain requires a restart but it has not been initiated yet.
+        /// </summary>
+        RestartRequired,
+        /// <summary>
+        /// Package or chain has already initiated the restart.
+        /// </summary>
+        RestartInitiated
+    }
+    /// <summary>
+    /// The relation type for related bundles.
+    /// </summary>
+    public enum RelationType
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// 
+        /// </summary>
+        Detect,
+        /// <summary>
+        /// 
+        /// </summary>
+        Upgrade,
+        /// <summary>
+        /// 
+        /// </summary>
+        Addon,
+        /// <summary>
+        /// 
+        /// </summary>
+        Patch,
+        /// <summary>
+        /// 
+        /// </summary>
+        Dependent,
+        /// <summary>
+        /// 
+        /// </summary>
+        Update,
+    }
+    /// <summary>
+    /// One or more reasons why the application is requested to be closed or is being closed.
+    /// </summary>
+    [Flags]
+    public enum EndSessionReasons
+    {
+        /// <summary>
+        /// The system is shutting down or restarting (it is not possible to determine which event is occurring).
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// The application is using a file that must be replaced, the system is being serviced, or system resources are exhausted.
+        /// </summary>
+        CloseApplication,
+        /// <summary>
+        /// The application is forced to shut down.
+        /// </summary>
+        Critical = 0x40000000,
+        /// <summary>
+        /// The user is logging off.
+        /// </summary>
+        Logoff = unchecked((int)0x80000000)
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.ApplyComplete"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_APPLYCOMPLETE_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to restart.
+        /// The engine will not launch again after the machine is rebooted.
+        /// Ignored if reboot was already initiated by <see cref="IDefaultBootstrapperApplication.ExecutePackageComplete"/>.
+        /// </summary>
+        Restart,
+    }
+    /// <summary>
+    /// The cache strategy to be used for the package.
+    /// </summary>
+    public enum BOOTSTRAPPER_CACHE_TYPE
+    {
+        /// <summary>
+        /// The package will be cached in order to securely run the package, but will always be cleaned from the cache at the end.
+        /// </summary>
+        Remove,
+        /// <summary>
+        /// The package will be cached in order to run the package, and then kept in the cache until the package is uninstalled.
+        /// </summary>
+        Keep,
+        /// <summary>
+        /// The package will always be cached and stay in the cache, unless the package and bundle are both being uninstalled.
+        /// </summary>
+        Force,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.CacheAcquireComplete"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to try the acquisition of the payload again.
+        /// Ignored if hrStatus is a success.
+        /// </summary>
+        Retry,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.CachePackageComplete"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to ignore non-vital package failures and continue with the caching.
+        /// Ignored if hrStatus is a success or the package is vital.
+        /// </summary>
+        Ignore,
+        /// <summary>
+        /// Instructs the engine to try the acquisition and verification of the package again.
+        /// Ignored if hrStatus is a success.
+        /// </summary>
+        Retry,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.CacheVerifyComplete"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Ignored if hrStatus is a success.
+        /// </summary>
+        RetryVerification,
+        /// <summary>
+        /// Ignored if hrStatus is a success.
+        /// </summary>
+        RetryAcquisition,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.ExecutePackageComplete"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to ignore non-vital package failures and continue with the install.
+        /// Ignored if hrStatus is a success or the package is vital.
+        /// </summary>
+        Ignore,
+        /// <summary>
+        /// Instructs the engine to try the execution of the package again.
+        /// Ignored if hrStatus is a success.
+        /// </summary>
+        Retry,
+        /// <summary>
+        /// Instructs the engine to stop processing the chain and restart.
+        /// The engine will launch again after the machine is restarted.
+        /// </summary>
+        Restart,
+        /// <summary>
+        /// Instructs the engine to stop processing the chain and suspend the current state.
+        /// </summary>
+        Suspend,
+    }
+    /// <summary>
+    /// The result of evaluating a condition from a package.
+    /// </summary>
+    public enum BOOTSTRAPPER_PACKAGE_CONDITION_RESULT
+    {
+        /// <summary>
+        /// No condition was authored.
+        /// </summary>
+        Default,
+        /// <summary>
+        /// Evaluated to false.
+        /// </summary>
+        False,
+        /// <summary>
+        /// Evaluated to true.
+        /// </summary>
+        True,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.CacheAcquireResolving"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_RESOLVESOURCE_ACTION
+    {
+        /// <summary>
+        /// Instructs the engine that the source can't be found.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to try the local source again.
+        /// </summary>
+        Retry,
+        /// <summary>
+        /// Instructs the engine to try the download source.
+        /// </summary>
+        Download,
+    }
+    /// <summary>
+    /// The available actions for <see cref="IDefaultBootstrapperApplication.Shutdown"/>.
+    /// </summary>
+    public enum BOOTSTRAPPER_SHUTDOWN_ACTION
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// Instructs the engine to restart.
+        /// The engine will not launch again after the machine is rebooted.
+        /// Ignored if reboot was already initiated by <see cref="IDefaultBootstrapperApplication.ExecutePackageComplete"/>.
+        /// </summary>
+        Restart,
+        /// <summary>
+        /// Instructs the engine to unload the bootstrapper application and
+        /// restart the engine which will load the bootstrapper application again.
+        /// Typically used to switch from a native bootstrapper application to a managed one.
+        /// </summary>
+        ReloadBootstrapper,
+        /// <summary>
+        /// Opts out of the engine behavior of trying to uninstall itself when no non-permanent packages are installed.
+        /// </summary>
+        SkipCleanup,
+    }
+    /// <summary>
+    /// The property Burn will add so the MSI can know the planned action for the package.
+    /// </summary>
+    public enum BURN_MSI_PROPERTY
+    {
+        /// <summary>
+        /// No property will be added.
+        /// </summary>
+        None,
+        /// <summary>
+        /// Add BURNMSIINSTALL=1
+        /// </summary>
+        Install,
+        /// <summary>
+        /// Add BURNMSIMODFIY=1
+        /// </summary>
+        Modify,
+        /// <summary>
+        /// Add BURNMSIREPAIR=1
+        /// </summary>
+        Repair,
+        /// <summary>
+        /// Add BURNMSIUNINSTALL=1
+        /// </summary>
+        Uninstall,
+    }
+    /// <summary>
+    /// From msi.h
+    /// https://docs.microsoft.com/en-us/windows/win32/api/msi/nf-msi-msisetinternalui
+    /// </summary>
+    [Flags]
+    public enum INSTALLUILEVEL
+    {
+        /// <summary>
+        /// UI level is unchanged
+        /// </summary>
+        NoChange = 0,
+        /// <summary>
+        /// default UI is used
+        /// </summary>
+        Default = 1,
+        /// <summary>
+        /// completely silent installation
+        /// </summary>
+        None = 2,
+        /// <summary>
+        /// simple progress and error handling
+        /// </summary>
+        Basic = 3,
+        /// <summary>
+        /// authored UI, wizard dialogs suppressed
+        /// </summary>
+        Reduced = 4,
+        /// <summary>
+        /// authored UI with wizards, progress, errors
+        /// </summary>
+        Full = 5,
+        /// <summary>
+        /// display success/failure dialog at end of install
+        /// </summary>
+        EndDialog = 0x80,
+        /// <summary>
+        /// display only progress dialog
+        /// </summary>
+        ProgressOnly = 0x40,
+        /// <summary>
+        /// do not display the cancel button in basic UI
+        /// </summary>
+        HideCancel = 0x20,
+        /// <summary>
+        /// force display of source resolution even if quiet
+        /// </summary>
+        SourceResOnly = 0x100,
+        /// <summary>
+        /// show UAC prompt even if quiet
+        /// Can only be used if on Windows Installer 5.0 or later
+        /// </summary>
+        UacOnly = 0x200,
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationData.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationData.cs
new file mode 100644
index 00000000..23a1c8a3
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationData.cs
@@ -0,0 +1,22 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System.IO;
+    /// <summary>
+    /// Interface for BootstrapperApplicationData.xml.
+    /// </summary>
+    public interface IBootstrapperApplicationData
+    {
+        /// <summary>
+        /// The BootstrapperApplicationData.xml file.
+        /// </summary>
+        FileInfo BADataFile { get; }
+        /// <summary>
+        /// The BA manifest.
+        /// </summary>
+        IBundleInfo Bundle { get; }
+    }
+}
+\ No newline at end of file
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationFactory.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationFactory.cs
new file mode 100644
index 00000000..0f9193d0
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperApplicationFactory.cs
@@ -0,0 +1,66 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.CodeDom.Compiler;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// Interface used by WixToolset.Mba.Host to dynamically load the BA.
+    /// </summary>
+    [ComVisible(true)]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    [Guid("2965A12F-AC7B-43A0-85DF-E4B2168478A4")]
+    [GeneratedCodeAttribute("WixToolset.Bootstrapper.InteropCodeGenerator", "1.0.0.0")]
+    public interface IBootstrapperApplicationFactory
+    {
+        /// <summary>
+        /// Low level method called by the native host.
+        /// </summary>
+        /// <param name="pArgs"></param>
+        /// <param name="pResults"></param>
+        void Create(
+            IntPtr pArgs,
+            IntPtr pResults
+            );
+    }
+    [Serializable]
+    [StructLayout(LayoutKind.Sequential)]
+    [GeneratedCodeAttribute("WixToolset.Bootstrapper.InteropCodeGenerator", "1.0.0.0")]
+    internal struct Command
+    {
+        // Strings must be declared as pointers so that Marshaling doesn't free them.
+        [MarshalAs(UnmanagedType.I4)] internal int cbSize;
+        [MarshalAs(UnmanagedType.U4)] private readonly LaunchAction action;
+        [MarshalAs(UnmanagedType.U4)] private readonly Display display;
+        [MarshalAs(UnmanagedType.U4)] private readonly Restart restart;
+        private readonly IntPtr wzCommandLine;
+        [MarshalAs(UnmanagedType.I4)] private readonly int nCmdShow;
+        [MarshalAs(UnmanagedType.U4)] private readonly ResumeType resume;
+        private readonly IntPtr hwndSplashScreen;
+        [MarshalAs(UnmanagedType.I4)] private readonly RelationType relation;
+        [MarshalAs(UnmanagedType.Bool)] private readonly bool passthrough;
+        private readonly IntPtr wzLayoutDirectory;
+        private readonly IntPtr wzBootstrapperWorkingFolder;
+        private readonly IntPtr wzBootstrapperApplicationDataPath;
+        public IBootstrapperCommand GetBootstrapperCommand()
+        {
+            return new BootstrapperCommand(
+                this.action,
+                this.display,
+                this.restart,
+                Marshal.PtrToStringUni(this.wzCommandLine),
+                this.nCmdShow,
+                this.resume,
+                this.hwndSplashScreen,
+                this.relation,
+                this.passthrough,
+                Marshal.PtrToStringUni(this.wzLayoutDirectory),
+                Marshal.PtrToStringUni(this.wzBootstrapperWorkingFolder),
+                Marshal.PtrToStringUni(this.wzBootstrapperApplicationDataPath));
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperCommand.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperCommand.cs
new file mode 100644
index 00000000..e861813f
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperCommand.cs
@@ -0,0 +1,76 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    /// <summary>
+    /// Command information passed from the engine for the BA to perform.
+    /// </summary>
+    public interface IBootstrapperCommand
+    {
+        /// <summary>
+        /// Gets the action for the BA to perform.
+        /// </summary>
+        LaunchAction Action { get; }
+        /// <summary>
+        /// Gets the display level for the BA.
+        /// </summary>
+        Display Display { get; }
+        /// <summary>
+        /// Gets the action to perform if a reboot is required.
+        /// </summary>
+        Restart Restart { get; }
+        /// <summary>
+        /// Gets the command line arguments as a string array.
+        /// </summary>
+        /// <returns>
+        /// Array of command line arguments not handled by the engine.
+        /// </returns>
+        /// <exception type="Win32Exception">The command line could not be parsed into an array.</exception>
+        string[] CommandLineArgs { get; }
+        /// <summary>
+        /// Hint for the initial visibility of the window.
+        /// </summary>
+        int CmdShow { get; }
+        /// <summary>
+        /// Gets the method of how the engine was resumed from a previous installation step.
+        /// </summary>
+        ResumeType Resume { get; }
+        /// <summary>
+        /// Gets the handle to the splash screen window. If no splash screen was displayed this value will be IntPtr.Zero.
+        /// </summary>
+        IntPtr SplashScreen { get; }
+        /// <summary>
+        /// If this was run from a related bundle, specifies the relation type.
+        /// </summary>
+        RelationType Relation { get; }
+        /// <summary>
+        /// If this was run from a backward compatible bundle.
+        /// </summary>
+        bool Passthrough { get; }
+        /// <summary>
+        /// Gets layout directory.
+        /// </summary>
+        string LayoutDirectory { get; }
+        /// <summary>
+        /// Gets bootstrapper working folder.
+        /// </summary>
+        string BootstrapperWorkingFolder { get; }
+        /// <summary>
+        /// Gets path to BootstrapperApplicationData.xml.
+        /// </summary>
+        string BootstrapperApplicationDataPath { get; }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IBootstrapperEngine.cs b/src/api/burn/WixToolset.Mba.Core/IBootstrapperEngine.cs
new file mode 100644
index 00000000..4e19bf0f
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBootstrapperEngine.cs
@@ -0,0 +1,536 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.CodeDom.Compiler;
+    using System.Runtime.InteropServices;
+    using System.Text;
+    /// <summary>
+    /// Allows calls into the bootstrapper engine.
+    /// </summary>
+    [ComImport]
+    [InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
+    [Guid("6480D616-27A0-44D7-905B-81512C29C2FB")]
+    [GeneratedCodeAttribute("WixToolset.Bootstrapper.InteropCodeGenerator", "1.0.0.0")]
+    public interface IBootstrapperEngine
+    {
+        /// <summary>
+        /// See <see cref="IEngine.PackageCount"/>.
+        /// </summary>
+        /// <param name="pcPackages"></param>
+        void GetPackageCount(
+            [MarshalAs(UnmanagedType.U4)] out int pcPackages
+            );
+        /// <summary>
+        /// See <see cref="IEngine.GetVariableNumeric(string)"/>.
+        /// </summary>
+        /// <param name="wzVariable"></param>
+        /// <param name="pllValue"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        int GetVariableNumeric(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+            out long pllValue
+            );
+        /// <summary>
+        /// See <see cref="IEngine.GetVariableString(string)"/>.
+        /// </summary>
+        [PreserveSig]
+        int GetVariableString(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+                                              IntPtr wzValue,
+                                          ref IntPtr pcchValue
+            );
+        /// <summary>
+        /// See <see cref="IEngine.GetVariableVersion(string)"/>.
+        /// </summary>
+        [PreserveSig]
+        int GetVariableVersion(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+                                              IntPtr wzValue,
+                                          ref IntPtr pcchValue
+            );
+        /// <summary>
+        /// See <see cref="IEngine.FormatString(string)"/>.
+        /// </summary>
+        [PreserveSig]
+        int FormatString(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzIn,
+            [MarshalAs(UnmanagedType.LPWStr), Out] StringBuilder wzOut,
+            ref IntPtr pcchOut
+            );
+        /// <summary>
+        /// See <see cref="IEngine.EscapeString(string)"/>.
+        /// </summary>
+        [PreserveSig]
+        int EscapeString(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzIn,
+            [MarshalAs(UnmanagedType.LPWStr), Out] StringBuilder wzOut,
+            ref IntPtr pcchOut
+            );
+        /// <summary>
+        /// See <see cref="IEngine.EvaluateCondition(string)"/>.
+        /// </summary>
+        /// <param name="wzCondition"></param>
+        /// <param name="pf"></param>
+        void EvaluateCondition(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzCondition,
+            [MarshalAs(UnmanagedType.Bool)] out bool pf
+            );
+        /// <summary>
+        /// See <see cref="IEngine.Log(LogLevel, string)"/>.
+        /// </summary>
+        /// <param name="level"></param>
+        /// <param name="wzMessage"></param>
+        void Log(
+            [MarshalAs(UnmanagedType.U4)] LogLevel level,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzMessage
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SendEmbeddedError(int, string, int)"/>.
+        /// </summary>
+        /// <param name="dwErrorCode"></param>
+        /// <param name="wzMessage"></param>
+        /// <param name="dwUIHint"></param>
+        /// <param name="pnResult"></param>
+        void SendEmbeddedError(
+            [MarshalAs(UnmanagedType.U4)] int dwErrorCode,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzMessage,
+            [MarshalAs(UnmanagedType.U4)] int dwUIHint,
+            [MarshalAs(UnmanagedType.I4)] out int pnResult
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SendEmbeddedProgress(int, int)"/>.
+        /// </summary>
+        /// <param name="dwProgressPercentage"></param>
+        /// <param name="dwOverallProgressPercentage"></param>
+        /// <param name="pnResult"></param>
+        void SendEmbeddedProgress(
+            [MarshalAs(UnmanagedType.U4)] int dwProgressPercentage,
+            [MarshalAs(UnmanagedType.U4)] int dwOverallProgressPercentage,
+            [MarshalAs(UnmanagedType.I4)] out int pnResult
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetUpdate(string, string, long, UpdateHashType, byte[])"/>.
+        /// </summary>
+        /// <param name="wzLocalSource"></param>
+        /// <param name="wzDownloadSource"></param>
+        /// <param name="qwValue"></param>
+        /// <param name="hashType"></param>
+        /// <param name="rgbHash"></param>
+        /// <param name="cbHash"></param>
+        void SetUpdate(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzLocalSource,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzDownloadSource,
+            [MarshalAs(UnmanagedType.U8)] long qwValue,
+            [MarshalAs(UnmanagedType.U4)] UpdateHashType hashType,
+            [MarshalAs(UnmanagedType.LPArray, SizeParamIndex=4)] byte[] rgbHash,
+            [MarshalAs(UnmanagedType.U4)] int cbHash
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetLocalSource(string, string, string)"/>.
+        /// </summary>
+        /// <param name="wzPackageOrContainerId"></param>
+        /// <param name="wzPayloadId"></param>
+        /// <param name="wzPath"></param>
+        void SetLocalSource(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPath
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetDownloadSource(string, string, string, string, string)"/>.
+        /// </summary>
+        /// <param name="wzPackageOrContainerId"></param>
+        /// <param name="wzPayloadId"></param>
+        /// <param name="wzUrl"></param>
+        /// <param name="wzUser"></param>
+        /// <param name="wzPassword"></param>
+        void SetDownloadSource(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPackageOrContainerId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPayloadId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzUrl,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzUser,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzPassword
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetVariableNumeric(string, long)"/>.
+        /// </summary>
+        /// <param name="wzVariable"></param>
+        /// <param name="llValue"></param>
+        void SetVariableNumeric(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+            long llValue
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetVariableString(string, string, bool)"/>.
+        /// </summary>
+        /// <param name="wzVariable"></param>
+        /// <param name="wzValue"></param>
+        /// <param name="fFormatted"></param>
+        void SetVariableString(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+                                              IntPtr wzValue,
+            [MarshalAs(UnmanagedType.Bool)]   bool fFormatted
+            );
+        /// <summary>
+        /// See <see cref="IEngine.SetVariableVersion(string, string)"/>.
+        /// </summary>
+        /// <param name="wzVariable"></param>
+        /// <param name="wzValue"></param>
+        void SetVariableVersion(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
+                                              IntPtr wzValue
+            );
+        /// <summary>
+        /// See <see cref="IEngine.CloseSplashScreen"/>.
+        /// </summary>
+        void CloseSplashScreen();
+        /// <summary>
+        /// See <see cref="IEngine.Detect(IntPtr)"/>.
+        /// </summary>
+        /// <param name="hwndParent"></param>
+        void Detect(
+            IntPtr hwndParent
+            );
+        /// <summary>
+        /// See <see cref="IEngine.Plan(LaunchAction)"/>.
+        /// </summary>
+        /// <param name="action"></param>
+        void Plan(
+            [MarshalAs(UnmanagedType.U4)] LaunchAction action
+            );
+        /// <summary>
+        /// See <see cref="IEngine.Elevate(IntPtr)"/>.
+        /// </summary>
+        /// <param name="hwndParent"></param>
+        /// <returns></returns>
+        [PreserveSig]
+        int Elevate(
+            IntPtr hwndParent
+            );
+        /// <summary>
+        /// See <see cref="IEngine.Apply(IntPtr)"/>.
+        /// </summary>
+        /// <param name="hwndParent"></param>
+        void Apply(
+            IntPtr hwndParent
+            );
+        /// <summary>
+        /// See <see cref="IEngine.Quit(int)"/>.
+        /// </summary>
+        /// <param name="dwExitCode"></param>
+        void Quit(
+            [MarshalAs(UnmanagedType.U4)] int dwExitCode
+            );
+        /// <summary>
+        /// See <see cref="IEngine.LaunchApprovedExe(IntPtr, string, string, int)"/>.
+        /// </summary>
+        /// <param name="hwndParent"></param>
+        /// <param name="wzApprovedExeForElevationId"></param>
+        /// <param name="wzArguments"></param>
+        /// <param name="dwWaitForInputIdleTimeout"></param>
+        void LaunchApprovedExe(
+            IntPtr hwndParent,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzApprovedExeForElevationId,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzArguments,
+            [MarshalAs(UnmanagedType.U4)] int dwWaitForInputIdleTimeout
+            );
+        /// <summary>
+        /// Sets the URL to the update feed.
+        /// </summary>
+        /// <param name="url">URL of the update feed.</param>
+        void SetUpdateSource(
+            [MarshalAs(UnmanagedType.LPWStr)] string url
+            );
+        /// <summary>
+        /// See <see cref="IEngine.CompareVersions(string, string)"/>.
+        /// </summary>
+        /// <param name="wzVersion1"></param>
+        /// <param name="wzVersion2"></param>
+        /// <param name="pnResult"></param>
+        void CompareVersions(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion1,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion2,
+            [MarshalAs(UnmanagedType.I4)] out int pnResult
+            );
+    }
+    /// <summary>
+    /// The installation action for the bundle or current package.
+    /// </summary>
+    public enum ActionState
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// 
+        /// </summary>
+        Uninstall,
+        /// <summary>
+        /// 
+        /// </summary>
+        Install,
+        /// <summary>
+        /// 
+        /// </summary>
+        Modify,
+        /// <summary>
+        /// 
+        /// </summary>
+        Mend,
+        /// <summary>
+        /// 
+        /// </summary>
+        Repair,
+        /// <summary>
+        /// 
+        /// </summary>
+        MinorUpgrade,
+    }
+    /// <summary>
+    /// The action for the BA to perform.
+    /// </summary>
+    public enum LaunchAction
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Help,
+        /// <summary>
+        /// 
+        /// </summary>
+        Layout,
+        /// <summary>
+        /// 
+        /// </summary>
+        Uninstall,
+        /// <summary>
+        /// 
+        /// </summary>
+        Cache,
+        /// <summary>
+        /// 
+        /// </summary>
+        Install,
+        /// <summary>
+        /// 
+        /// </summary>
+        Modify,
+        /// <summary>
+        /// 
+        /// </summary>
+        Repair,
+        /// <summary>
+        /// 
+        /// </summary>
+        UpdateReplace,
+        /// <summary>
+        /// 
+        /// </summary>
+        UpdateReplaceEmbedded,
+    }
+    /// <summary>
+    /// The message log level.
+    /// </summary>
+    public enum LogLevel
+    {
+        /// <summary>
+        /// No logging level (generic).
+        /// </summary>
+        None,
+        /// <summary>
+        /// User messages.
+        /// </summary>
+        Standard,
+        /// <summary>
+        /// Verbose messages.
+        /// </summary>
+        Verbose,
+        /// <summary>
+        /// Messages for debugging.
+        /// </summary>
+        Debug,
+        /// <summary>
+        /// Error messages.
+        /// </summary>
+        Error,
+    }
+    /// <summary>
+    /// Type of hash used for update bundle.
+    /// </summary>
+    public enum UpdateHashType
+    {
+        /// <summary>
+        /// No hash provided.
+        /// </summary>
+        None,
+        /// <summary>
+        /// SHA-1 based hash provided.
+        /// </summary>
+        Sha1,
+    }
+    /// <summary>
+    /// Describes the state of an installation package.
+    /// </summary>
+    public enum PackageState
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Obsolete,
+        /// <summary>
+        /// 
+        /// </summary>
+        Absent,
+        /// <summary>
+        /// 
+        /// </summary>
+        Cached,
+        /// <summary>
+        /// 
+        /// </summary>
+        Present,
+        /// <summary>
+        /// 
+        /// </summary>
+        Superseded,
+    }
+    /// <summary>
+    /// Indicates the state desired for an installation package.
+    /// </summary>
+    public enum RequestState
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        None,
+        /// <summary>
+        /// /
+        /// </summary>
+        ForceAbsent,
+        /// <summary>
+        /// 
+        /// </summary>
+        Absent,
+        /// <summary>
+        /// 
+        /// </summary>
+        Cache,
+        /// <summary>
+        /// 
+        /// </summary>
+        Present,
+        /// <summary>
+        /// 
+        /// </summary>
+        Mend,
+        /// <summary>
+        /// 
+        /// </summary>
+        Repair,
+    }
+    /// <summary>
+    /// Indicates the state of a feature.
+    /// </summary>
+    public enum FeatureState
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Absent,
+        /// <summary>
+        /// 
+        /// </summary>
+        Advertised,
+        /// <summary>
+        /// 
+        /// </summary>
+        Local,
+        /// <summary>
+        /// 
+        /// </summary>
+        Source,
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IBundleInfo.cs b/src/api/burn/WixToolset.Mba.Core/IBundleInfo.cs
new file mode 100644
index 00000000..f4a82f36
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IBundleInfo.cs
@@ -0,0 +1,39 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System.Collections.Generic;
+    /// <summary>
+    /// BA manifest data.
+    /// </summary>
+    public interface IBundleInfo
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        string LogVariable { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string Name { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        IDictionary<string, IPackageInfo> Packages { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        bool PerMachine { get; }
+        /// <summary>
+        /// Adds a related bundle as a package.
+        /// </summary>
+        /// <param name="e"></param>
+        /// <returns>The created <see cref="IPackageInfo"/>.</returns>
+        IPackageInfo AddRelatedBundleAsPackage(DetectRelatedBundleEventArgs e);
+    }
+}
+\ No newline at end of file
diff --git a/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
new file mode 100644
index 00000000..a295f6c0
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IDefaultBootstrapperApplication.cs
@@ -0,0 +1,387 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    /// <summary>
+    /// Interface for built-in implementation of <see cref="IBootstrapperApplication"/>.
+    /// </summary>
+    public interface IDefaultBootstrapperApplication : IBootstrapperApplication
+    {
+        /// <summary>
+        /// Fired when the engine has begun installing the bundle.
+        /// </summary>
+        event EventHandler<ApplyBeginEventArgs> ApplyBegin;
+        /// <summary>
+        /// Fired when the engine has completed installing the bundle.
+        /// </summary>
+        event EventHandler<ApplyCompleteEventArgs> ApplyComplete;
+        /// <summary>
+        /// Fired when the engine is about to begin an MSI transaction.
+        /// </summary>
+        event EventHandler<BeginMsiTransactionBeginEventArgs> BeginMsiTransactionBegin;
+        /// <summary>
+        /// Fired when the engine has completed beginning an MSI transaction.
+        /// </summary>
+        event EventHandler<BeginMsiTransactionCompleteEventArgs> BeginMsiTransactionComplete;
+        /// <summary>
+        /// Fired when the engine has begun acquiring the payload or container.
+        /// The BA can change the source using <see cref="IEngine.SetLocalSource(string, string, string)"/>
+        /// or <see cref="IEngine.SetDownloadSource(string, string, string, string, string)"/>.
+        /// </summary>
+        event EventHandler<CacheAcquireBeginEventArgs> CacheAcquireBegin;
+        /// <summary>
+        /// Fired when the engine has completed the acquisition of the payload or container.
+        /// The BA can change the source using <see cref="IEngine.SetLocalSource(string, string, string)"/>
+        /// or <see cref="IEngine.SetDownloadSource(string, string, string, string, string)"/>.
+        /// </summary>
+        event EventHandler<CacheAcquireCompleteEventArgs> CacheAcquireComplete;
+        /// <summary>
+        /// Fired when the engine has progress acquiring the payload or container.
+        /// </summary>
+        event EventHandler<CacheAcquireProgressEventArgs> CacheAcquireProgress;
+        /// <summary>
+        /// Fired by the engine to allow the BA to override the acquisition action.
+        /// </summary>
+        event EventHandler<CacheAcquireResolvingEventArgs> CacheAcquireResolving;
+        /// <summary>
+        /// Fired when the engine has begun caching the installation sources.
+        /// </summary>
+        event EventHandler<CacheBeginEventArgs> CacheBegin;
+        /// <summary>
+        /// Fired after the engine has cached the installation sources.
+        /// </summary>
+        event EventHandler<CacheCompleteEventArgs> CacheComplete;
+        /// <summary>
+        /// Fired when the engine begins the verification of the payload or container that was already in the package cache.
+        /// </summary>
+        event EventHandler<CacheContainerOrPayloadVerifyBeginEventArgs> CacheContainerOrPayloadVerifyBegin;
+        /// <summary>
+        /// Fired when the engine has completed the verification of the payload or container that was already in the package cache.
+        /// </summary>
+        event EventHandler<CacheContainerOrPayloadVerifyCompleteEventArgs> CacheContainerOrPayloadVerifyComplete;
+        /// <summary>
+        /// Fired when the engine has progress verifying the payload or container that was already in the package cache.
+        /// </summary>
+        event EventHandler<CacheContainerOrPayloadVerifyProgressEventArgs> CacheContainerOrPayloadVerifyProgress;
+        /// <summary>
+        /// Fired when the engine has begun caching a specific package.
+        /// </summary>
+        event EventHandler<CachePackageBeginEventArgs> CachePackageBegin;
+        /// <summary>
+        /// Fired when the engine has completed caching a specific package.
+        /// </summary>
+        event EventHandler<CachePackageCompleteEventArgs> CachePackageComplete;
+        /// <summary>
+        /// Fired when the engine begins the extraction of the payload from the container.
+        /// </summary>
+        event EventHandler<CachePayloadExtractBeginEventArgs> CachePayloadExtractBegin;
+        /// <summary>
+        /// Fired when the engine has completed the extraction of the payload from the container.
+        /// </summary>
+        event EventHandler<CachePayloadExtractCompleteEventArgs> CachePayloadExtractComplete;
+        /// <summary>
+        /// Fired when the engine has progress extracting the payload from the container.
+        /// </summary>
+        event EventHandler<CachePayloadExtractProgressEventArgs> CachePayloadExtractProgress;
+        /// <summary>
+        /// Fired when the engine begins the verification of the acquired payload or container.
+        /// </summary>
+        event EventHandler<CacheVerifyBeginEventArgs> CacheVerifyBegin;
+        /// <summary>
+        /// Fired when the engine has completed the verification of the acquired payload or container.
+        /// </summary>
+        event EventHandler<CacheVerifyCompleteEventArgs> CacheVerifyComplete;
+        /// <summary>
+        /// Fired when the engine has progress verifying the payload or container.
+        /// </summary>
+        event EventHandler<CacheVerifyProgressEventArgs> CacheVerifyProgress;
+        /// <summary>
+        /// Fired when the engine is about to commit an MSI transaction.
+        /// </summary>
+        event EventHandler<CommitMsiTransactionBeginEventArgs> CommitMsiTransactionBegin;
+        /// <summary>
+        /// Fired when the engine has completed comitting an MSI transaction.
+        /// </summary>
+        event EventHandler<CommitMsiTransactionCompleteEventArgs> CommitMsiTransactionComplete;
+        /// <summary>
+        /// Fired when the overall detection phase has begun.
+        /// </summary>
+        event EventHandler<DetectBeginEventArgs> DetectBegin;
+        /// <summary>
+        /// Fired when the detection phase has completed.
+        /// </summary>
+        event EventHandler<DetectCompleteEventArgs> DetectComplete;
+        /// <summary>
+        /// Fired when a forward compatible bundle is detected.
+        /// </summary>
+        event EventHandler<DetectForwardCompatibleBundleEventArgs> DetectForwardCompatibleBundle;
+        /// <summary>
+        /// Fired when a feature in an MSI package has been detected.
+        /// </summary>
+        event EventHandler<DetectMsiFeatureEventArgs> DetectMsiFeature;
+        /// <summary>
+        /// Fired when the detection for a specific package has begun.
+        /// </summary>
+        event EventHandler<DetectPackageBeginEventArgs> DetectPackageBegin;
+        /// <summary>
+        /// Fired when the detection for a specific package has completed.
+        /// </summary>
+        event EventHandler<DetectPackageCompleteEventArgs> DetectPackageComplete;
+        /// <summary>
+        /// Fired when the engine detects a target product for an MSP package.
+        /// </summary>
+        event EventHandler<DetectPatchTargetEventArgs> DetectPatchTarget;
+        /// <summary>
+        /// Fired when a related bundle has been detected for a bundle.
+        /// </summary>
+        event EventHandler<DetectRelatedBundleEventArgs> DetectRelatedBundle;
+        /// <summary>
+        /// Fired when a related MSI package has been detected for a package.
+        /// </summary>
+        event EventHandler<DetectRelatedMsiPackageEventArgs> DetectRelatedMsiPackage;
+        /// <summary>
+        /// Fired when the update detection has found a potential update candidate.
+        /// </summary>
+        event EventHandler<DetectUpdateEventArgs> DetectUpdate;
+        /// <summary>
+        /// Fired when the update detection phase has begun.
+        /// </summary>
+        event EventHandler<DetectUpdateBeginEventArgs> DetectUpdateBegin;
+        /// <summary>
+        /// Fired when the update detection phase has completed.
+        /// </summary>
+        event EventHandler<DetectUpdateCompleteEventArgs> DetectUpdateComplete;
+        /// <summary>
+        /// Fired when the engine is about to start the elevated process.
+        /// </summary>
+        event EventHandler<ElevateBeginEventArgs> ElevateBegin;
+        /// <summary>
+        /// Fired when the engine has completed starting the elevated process.
+        /// </summary>
+        event EventHandler<ElevateCompleteEventArgs> ElevateComplete;
+        /// <summary>
+        /// Fired when the engine has encountered an error.
+        /// </summary>
+        event EventHandler<ErrorEventArgs> Error;
+        /// <summary>
+        /// Fired when the engine has begun installing packages.
+        /// </summary>
+        event EventHandler<ExecuteBeginEventArgs> ExecuteBegin;
+        /// <summary>
+        /// Fired when the engine has completed installing packages.
+        /// </summary>
+        event EventHandler<ExecuteCompleteEventArgs> ExecuteComplete;
+        /// <summary>
+        /// Fired when a package sends a files in use installation message.
+        /// </summary>
+        event EventHandler<ExecuteFilesInUseEventArgs> ExecuteFilesInUse;
+        /// <summary>
+        /// Fired when Windows Installer sends an installation message.
+        /// </summary>
+        event EventHandler<ExecuteMsiMessageEventArgs> ExecuteMsiMessage;
+        /// <summary>
+        /// Fired when the engine has begun installing a specific package.
+        /// </summary>
+        event EventHandler<ExecutePackageBeginEventArgs> ExecutePackageBegin;
+        /// <summary>
+        /// Fired when the engine has completed installing a specific package.
+        /// </summary>
+        event EventHandler<ExecutePackageCompleteEventArgs> ExecutePackageComplete;
+        /// <summary>
+        /// Fired when the engine executes one or more patches targeting a product.
+        /// </summary>
+        event EventHandler<ExecutePatchTargetEventArgs> ExecutePatchTarget;
+        /// <summary>
+        /// Fired by the engine while executing a package.
+        /// </summary>
+        event EventHandler<ExecuteProgressEventArgs> ExecuteProgress;
+        /// <summary>
+        /// Fired when the engine is about to launch the preapproved executable.
+        /// </summary>
+        event EventHandler<LaunchApprovedExeBeginEventArgs> LaunchApprovedExeBegin;
+        /// <summary>
+        /// Fired when the engine has completed launching the preapproved executable.
+        /// </summary>
+        event EventHandler<LaunchApprovedExeCompleteEventArgs> LaunchApprovedExeComplete;
+        /// <summary>
+        /// Fired when the engine is about to pause Windows automatic updates.
+        /// </summary>
+        event EventHandler<PauseAutomaticUpdatesBeginEventArgs> PauseAutomaticUpdatesBegin;
+        /// <summary>
+        /// Fired when the engine has completed pausing Windows automatic updates.
+        /// </summary>
+        event EventHandler<PauseAutomaticUpdatesCompleteEventArgs> PauseAutomaticUpdatesComplete;
+        /// <summary>
+        /// Fired when the engine has begun planning the installation.
+        /// </summary>
+        event EventHandler<PlanBeginEventArgs> PlanBegin;
+        /// <summary>
+        /// Fired when the engine has completed planning the installation.
+        /// </summary>
+        event EventHandler<PlanCompleteEventArgs> PlanComplete;
+        /// <summary>
+        /// Fired when the engine is about to plan a forward compatible bundle.
+        /// </summary>
+        event EventHandler<PlanForwardCompatibleBundleEventArgs> PlanForwardCompatibleBundle;
+        /// <summary>
+        /// Fired when the engine has completed planning a package.
+        /// </summary>
+        event EventHandler<PlannedPackageEventArgs> PlannedPackage;
+        /// <summary>
+        /// Fired when the engine is about to plan a feature in an MSI package.
+        /// </summary>
+        event EventHandler<PlanMsiFeatureEventArgs> PlanMsiFeature;
+        /// <summary>
+        /// Fired when the engine is planning an MSI or MSP package.
+        /// </summary>
+        event EventHandler<PlanMsiPackageEventArgs> PlanMsiPackage;
+        /// <summary>
+        /// Fired when the engine has begun getting the BA's input for planning a package.
+        /// </summary>
+        event EventHandler<PlanPackageBeginEventArgs> PlanPackageBegin;
+        /// <summary>
+        /// Fired when the engine has completed getting the BA's input for planning a package.
+        /// </summary>
+        event EventHandler<PlanPackageCompleteEventArgs> PlanPackageComplete;
+        /// <summary>
+        /// Fired when the engine is about to plan a target of an MSP package.
+        /// </summary>
+        event EventHandler<PlanPatchTargetEventArgs> PlanPatchTarget;
+        /// <summary>
+        /// Fired when the engine has begun planning for a related bundle.
+        /// </summary>
+        event EventHandler<PlanRelatedBundleEventArgs> PlanRelatedBundle;
+        /// <summary>
+        /// Fired when the engine has changed progress for the bundle installation.
+        /// </summary>
+        event EventHandler<ProgressEventArgs> Progress;
+        /// <summary>
+        /// Fired when the engine has begun registering the location and visibility of the bundle.
+        /// </summary>
+        event EventHandler<RegisterBeginEventArgs> RegisterBegin;
+        /// <summary>
+        /// Fired when the engine has completed registering the location and visibility of the bundle.
+        /// </summary>
+        event EventHandler<RegisterCompleteEventArgs> RegisterComplete;
+        /// <summary>
+        /// Fired when the engine is about to rollback an MSI transaction.
+        /// </summary>
+        event EventHandler<RollbackMsiTransactionBeginEventArgs> RollbackMsiTransactionBegin;
+        /// <summary>
+        /// Fired when the engine has completed rolling back an MSI transaction.
+        /// </summary>
+        event EventHandler<RollbackMsiTransactionCompleteEventArgs> RollbackMsiTransactionComplete;
+        /// <summary>
+        /// Fired when the engine is shutting down the bootstrapper application.
+        /// </summary>
+        event EventHandler<ShutdownEventArgs> Shutdown;
+        /// <summary>
+        /// Fired when the engine is starting up the bootstrapper application.
+        /// </summary>
+        event EventHandler<StartupEventArgs> Startup;
+        /// <summary>
+        /// Fired when the engine is about to take a system restore point.
+        /// </summary>
+        event EventHandler<SystemRestorePointBeginEventArgs> SystemRestorePointBegin;
+        /// <summary>
+        /// Fired when the engine has completed taking a system restore point.
+        /// </summary>
+        event EventHandler<SystemRestorePointCompleteEventArgs> SystemRestorePointComplete;
+        /// <summary>
+        /// Fired when the system is shutting down or user is logging off.
+        /// </summary>
+        /// <remarks>
+        /// <para>To prevent shutting down or logging off, set <see cref="CancellableHResultEventArgs.Cancel"/> to
+        /// true; otherwise, set it to false.</para>
+        /// <para>By default setup will prevent shutting down or logging off between
+        /// <see cref="IDefaultBootstrapperApplication.ApplyBegin"/> and <see cref="IDefaultBootstrapperApplication.ApplyComplete"/>.
+        /// Derivatives can change this behavior by handling <see cref="IDefaultBootstrapperApplication.SystemShutdown"/>.</para>
+        /// <para>If <see cref="SystemShutdownEventArgs.Reasons"/> contains <see cref="EndSessionReasons.Critical"/>
+        /// the bootstrapper cannot prevent the shutdown and only has a few seconds to save state or perform any other
+        /// critical operations before being closed by the operating system.</para>
+        /// <para>This event may be fired on a different thread.</para>
+        /// </remarks>
+        event EventHandler<SystemShutdownEventArgs> SystemShutdown;
+        /// <summary>
+        /// Fired when the engine unregisters the bundle.
+        /// </summary>
+        event EventHandler<UnregisterBeginEventArgs> UnregisterBegin;
+        /// <summary>
+        /// Fired when the engine unregistration is complete.
+        /// </summary>
+        event EventHandler<UnregisterCompleteEventArgs> UnregisterComplete;
+    }
+}
+\ No newline at end of file
diff --git a/src/api/burn/WixToolset.Mba.Core/IEngine.cs b/src/api/burn/WixToolset.Mba.Core/IEngine.cs
new file mode 100644
index 00000000..3e636961
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IEngine.cs
@@ -0,0 +1,222 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.ComponentModel;
+    using System.Security;
+    /// <summary>
+    /// High level abstraction over the <see cref="IBootstrapperEngine"/> interface.
+    /// </summary>
+    public interface IEngine
+    {
+        /// <summary>
+        /// Gets the number of packages in the bundle.
+        /// </summary>
+        int PackageCount { get; }
+        /// <summary>
+        /// Install the packages.
+        /// </summary>
+        /// <param name="hwndParent">The parent window for the installation user interface.</param>
+        void Apply(IntPtr hwndParent);
+        /// <summary>
+        /// Close the splash screen if it is still open. Does nothing if the splash screen is not or
+        /// never was opened.
+        /// </summary>
+        void CloseSplashScreen();
+        /// <returns>0 if equal, 1 if version1 &gt; version2, -1 if version1 &lt; version2</returns>
+        int CompareVersions(string version1, string version2);
+        /// <summary>
+        /// Checks if a variable exists in the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        /// <returns>Whether the variable exists.</returns>
+        bool ContainsVariable(string name);
+        /// <summary>
+        /// Determine if all installation conditions are fulfilled.
+        /// </summary>
+        void Detect();
+        /// <summary>
+        /// Determine if all installation conditions are fulfilled.
+        /// </summary>
+        /// <param name="hwndParent">The parent window for the installation user interface.</param>
+        void Detect(IntPtr hwndParent);
+        /// <summary>
+        /// Elevate the install.
+        /// </summary>
+        /// <param name="hwndParent">The parent window of the elevation dialog.</param>
+        /// <returns>true if elevation succeeded; otherwise, false if the user cancelled.</returns>
+        /// <exception cref="Win32Exception">A Win32 error occurred.</exception>
+        bool Elevate(IntPtr hwndParent);
+        /// <summary>
+        /// Escapes the input string.
+        /// </summary>
+        /// <param name="input">The string to escape.</param>
+        /// <returns>The escaped string.</returns>
+        /// <exception cref="Win32Exception">A Win32 error occurred.</exception>
+        string EscapeString(string input);
+        /// <summary>
+        /// Evaluates the <paramref name="condition"/> string.
+        /// </summary>
+        /// <param name="condition">The string representing the condition to evaluate.</param>
+        /// <returns>Whether the condition evaluated to true or false.</returns>
+        bool EvaluateCondition(string condition);
+        /// <summary>
+        /// Formats the input string.
+        /// </summary>
+        /// <param name="format">The string to format.</param>
+        /// <returns>The formatted string.</returns>
+        /// <exception cref="Win32Exception">A Win32 error occurred.</exception>
+        string FormatString(string format);
+        /// <summary>
+        /// Gets numeric variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        long GetVariableNumeric(string name);
+        /// <summary>
+        /// Gets string variables for the engine using SecureStrings.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        SecureString GetVariableSecureString(string name);
+        /// <summary>
+        /// Gets string variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        string GetVariableString(string name);
+        /// <summary>
+        /// Gets <see cref="Version"/> variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        string GetVariableVersion(string name);
+        /// <summary>
+        /// Launches a preapproved executable elevated.  As long as the engine already elevated, there will be no UAC prompt.
+        /// </summary>
+        /// <param name="hwndParent">The parent window of the elevation dialog (if the engine hasn't elevated yet).</param>
+        /// <param name="approvedExeForElevationId">Id of the ApprovedExeForElevation element specified when the bundle was authored.</param>
+        /// <param name="arguments">Optional arguments.</param>
+        void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments);
+        /// <summary>
+        /// Launches a preapproved executable elevated.  As long as the engine already elevated, there will be no UAC prompt.
+        /// </summary>
+        /// <param name="hwndParent">The parent window of the elevation dialog (if the engine hasn't elevated yet).</param>
+        /// <param name="approvedExeForElevationId">Id of the ApprovedExeForElevation element specified when the bundle was authored.</param>
+        /// <param name="arguments">Optional arguments.</param>
+        /// <param name="waitForInputIdleTimeout">Timeout in milliseconds. When set to something other than zero, the engine will call WaitForInputIdle for the new process with this timeout before calling OnLaunchApprovedExeComplete.</param>
+        void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments, int waitForInputIdleTimeout);
+        /// <summary>
+        /// Logs the <paramref name="message"/>.
+        /// </summary>
+        /// <param name="level">The logging level.</param>
+        /// <param name="message">The message to log.</param>
+        void Log(LogLevel level, string message);
+        /// <summary>
+        /// Determine the installation sequencing and costing.
+        /// </summary>
+        /// <param name="action">The action to perform when planning.</param>
+        void Plan(LaunchAction action);
+        /// <summary>
+        /// Set the update information for a bundle.
+        /// </summary>
+        /// <param name="localSource">Optional local source path for the update. Default is "update\[OriginalNameOfBundle].exe".</param>
+        /// <param name="downloadSource">Optional download source for the update.</param>
+        /// <param name="size">Size of the expected update.</param>
+        /// <param name="hashType">Type of the hash expected on the update.</param>
+        /// <param name="hash">Optional hash expected for the update.</param>
+        void SetUpdate(string localSource, string downloadSource, long size, UpdateHashType hashType, byte[] hash);
+        /// <summary>
+        /// Sets the URL to the update feed.
+        /// </summary>
+        /// <param name="url">URL of the update feed.</param>
+        void SetUpdateSource(string url);
+        /// <summary>
+        /// Set the local source for a package or container.
+        /// </summary>
+        /// <param name="packageOrContainerId">The id that uniquely identifies the package or container.</param>
+        /// <param name="payloadId">The id that uniquely identifies the payload.</param>
+        /// <param name="path">The new source path.</param>
+        void SetLocalSource(string packageOrContainerId, string payloadId, string path);
+        /// <summary>
+        /// Set the new download URL for a package or container.
+        /// </summary>
+        /// <param name="packageOrContainerId">The id that uniquely identifies the package or container.</param>
+        /// <param name="payloadId">The id that uniquely identifies the payload.</param>
+        /// <param name="url">The new url.</param>
+        /// <param name="user">The user name for proxy authentication.</param>
+        /// <param name="password">The password for proxy authentication.</param>
+        void SetDownloadSource(string packageOrContainerId, string payloadId, string url, string user, string password);
+        /// <summary>
+        /// Sets numeric variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        /// <param name="value">The value to set.</param>
+        void SetVariableNumeric(string name, long value);
+        /// <summary>
+        /// Sets string variables for the engine using SecureStrings.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        /// <param name="value">The value to set.</param>
+        /// <param name="formatted">False if the value is a literal string.</param>
+        void SetVariableString(string name, SecureString value, bool formatted);
+        /// <summary>
+        /// Sets string variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        /// <param name="value">The value to set.</param>
+        /// <param name="formatted">False if the value is a literal string.</param>
+        void SetVariableString(string name, string value, bool formatted);
+        /// <summary>
+        /// Sets version variables for the engine.
+        /// </summary>
+        /// <param name="name">The name of the variable.</param>
+        /// <param name="value">The value to set.</param>
+        void SetVariableVersion(string name, string value);
+        /// <summary>
+        /// Sends error message when embedded.
+        /// </summary>
+        /// <param name="errorCode">Error code.</param>
+        /// <param name="message">Error message.</param>
+        /// <param name="uiHint">UI buttons to show on error dialog.</param>
+        int SendEmbeddedError(int errorCode, string message, int uiHint);
+        /// <summary>
+        /// Sends progress percentages when embedded.
+        /// </summary>
+        /// <param name="progressPercentage">Percentage completed thus far.</param>
+        /// <param name="overallPercentage">Overall percentage completed.</param>
+        int SendEmbeddedProgress(int progressPercentage, int overallPercentage);
+        /// <summary>
+        /// Shuts down the engine.
+        /// </summary>
+        /// <param name="exitCode">Exit code indicating reason for shut down.</param>
+        void Quit(int exitCode);
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/IPackageInfo.cs b/src/api/burn/WixToolset.Mba.Core/IPackageInfo.cs
new file mode 100644
index 00000000..a1d99b10
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/IPackageInfo.cs
@@ -0,0 +1,90 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    /// <summary>
+    /// Package information from the BA manifest.
+    /// </summary>
+    public interface IPackageInfo
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        BOOTSTRAPPER_CACHE_TYPE CacheType { get; }
+        /// <summary>
+        /// Place for the BA to store it's own custom data for this package.
+        /// </summary>
+        object CustomData { get; set; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string Description { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string DisplayInternalUICondition { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string DisplayName { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string Id { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string InstallCondition { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        bool Permanent { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        bool PrereqPackage { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string PrereqLicenseFile { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string PrereqLicenseUrl { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string ProductCode { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        PackageType Type { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string UpgradeCode { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        string Version { get; }
+        /// <summary>
+        /// 
+        /// </summary>
+        bool Vital { get; }
+    }
+}
+\ No newline at end of file
diff --git a/src/api/burn/WixToolset.Mba.Core/NativeMethods.cs b/src/api/burn/WixToolset.Mba.Core/NativeMethods.cs
new file mode 100644
index 00000000..adb2256e
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/NativeMethods.cs
@@ -0,0 +1,37 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// Contains native constants, functions, and structures for this assembly.
+    /// </summary>
+    internal static class NativeMethods
+    {
+        #region Error Constants
+        internal const int S_OK = 0;
+        internal const int E_MOREDATA = unchecked((int)0x800700ea);
+        internal const int E_INSUFFICIENT_BUFFER = unchecked((int)0x8007007a);
+        internal const int E_CANCELLED = unchecked((int)0x800704c7);
+        internal const int E_ALREADYINITIALIZED = unchecked((int)0x800704df);
+        internal const int E_NOTFOUND = unchecked((int)0x80070490);
+        internal const int E_NOTIMPL = unchecked((int)0x80004001);
+        internal const int E_UNEXPECTED = unchecked((int)0x8000ffff);
+        #endregion
+        #region Functions
+        [DllImport("shell32.dll", ExactSpelling = true, SetLastError = true)]
+        internal static extern IntPtr CommandLineToArgvW(
+            [MarshalAs(UnmanagedType.LPWStr)] string lpCmdLine,
+            out int pNumArgs
+            );
+        [DllImport("kernel32.dll", ExactSpelling = true, SetLastError = true)]
+        internal static extern IntPtr LocalFree(
+            IntPtr hMem
+            );
+        #endregion
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs b/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs
new file mode 100644
index 00000000..567a7cdd
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/PackageInfo.cs
@@ -0,0 +1,317 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Collections.Generic;
+    using System.Xml;
+    using System.Xml.XPath;
+    /// <summary>
+    /// 
+    /// </summary>
+    public enum PackageType
+    {
+        /// <summary>
+        /// 
+        /// </summary>
+        Unknown,
+        /// <summary>
+        /// 
+        /// </summary>
+        Exe,
+        /// <summary>
+        /// 
+        /// </summary>
+        Msi,
+        /// <summary>
+        /// 
+        /// </summary>
+        Msp,
+        /// <summary>
+        /// 
+        /// </summary>
+        Msu,
+        /// <summary>
+        /// 
+        /// </summary>
+        UpgradeBundle,
+        /// <summary>
+        /// 
+        /// </summary>
+        AddonBundle,
+        /// <summary>
+        /// 
+        /// </summary>
+        PatchBundle,
+    }
+    /// <summary>
+    /// Default implementation of <see cref="IPackageInfo"/>.
+    /// </summary>
+    public class PackageInfo : IPackageInfo
+    {
+        /// <inheritdoc/>
+        public string Id { get; internal set; }
+        /// <inheritdoc/>
+        public string DisplayName { get; internal set; }
+        /// <inheritdoc/>
+        public string Description { get; internal set; }
+        /// <inheritdoc/>
+        public PackageType Type { get; internal set; }
+        /// <inheritdoc/>
+        public bool Permanent { get; internal set; }
+        /// <inheritdoc/>
+        public bool Vital { get; internal set; }
+        /// <inheritdoc/>
+        public string DisplayInternalUICondition { get; internal set; }
+        /// <inheritdoc/>
+        public string ProductCode { get; internal set; }
+        /// <inheritdoc/>
+        public string UpgradeCode { get; internal set; }
+        /// <inheritdoc/>
+        public string Version { get; internal set; }
+        /// <inheritdoc/>
+        public string InstallCondition { get; internal set; }
+        /// <inheritdoc/>
+        public BOOTSTRAPPER_CACHE_TYPE CacheType { get; internal set; }
+        /// <inheritdoc/>
+        public bool PrereqPackage { get; internal set; }
+        /// <inheritdoc/>
+        public string PrereqLicenseFile { get; internal set; }
+        /// <inheritdoc/>
+        public string PrereqLicenseUrl { get; internal set; }
+        /// <inheritdoc/>
+        public object CustomData { get; set; }
+        internal PackageInfo() { }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="root"></param>
+        /// <returns></returns>
+        public static IDictionary<string, IPackageInfo> ParsePackagesFromXml(XPathNavigator root)
+        {
+            var packagesById = new Dictionary<string, IPackageInfo>();
+            XmlNamespaceManager namespaceManager = new XmlNamespaceManager(root.NameTable);
+            namespaceManager.AddNamespace("p", BootstrapperApplicationData.XMLNamespace);
+            XPathNodeIterator nodes = root.Select("/p:BootstrapperApplicationData/p:WixPackageProperties", namespaceManager);
+            foreach (XPathNavigator node in nodes)
+            {
+                var package = new PackageInfo();
+                string id = BootstrapperApplicationData.GetAttribute(node, "Package");
+                if (id == null)
+                {
+                    throw new Exception("Failed to get package identifier for package.");
+                }
+                package.Id = id;
+                package.DisplayName = BootstrapperApplicationData.GetAttribute(node, "DisplayName");
+                package.Description = BootstrapperApplicationData.GetAttribute(node, "Description");
+                PackageType? packageType = GetPackageTypeAttribute(node, "PackageType");
+                if (!packageType.HasValue)
+                {
+                    throw new Exception("Failed to get package type for package.");
+                }
+                package.Type = packageType.Value;
+                bool? permanent = BootstrapperApplicationData.GetYesNoAttribute(node, "Permanent");
+                if (!permanent.HasValue)
+                {
+                    throw new Exception("Failed to get permanent settings for package.");
+                }
+                package.Permanent = permanent.Value;
+                bool? vital = BootstrapperApplicationData.GetYesNoAttribute(node, "Vital");
+                if (!vital.HasValue)
+                {
+                    throw new Exception("Failed to get vital setting for package.");
+                }
+                package.Vital = vital.Value;
+                package.ProductCode = BootstrapperApplicationData.GetAttribute(node, "ProductCode");
+                package.UpgradeCode = BootstrapperApplicationData.GetAttribute(node, "UpgradeCode");
+                package.Version = BootstrapperApplicationData.GetAttribute(node, "Version");
+                package.InstallCondition = BootstrapperApplicationData.GetAttribute(node, "InstallCondition");
+                packagesById.Add(package.Id, package);
+            }
+            ParseBalPackageInfoFromXml(root, namespaceManager, packagesById);
+            return packagesById;
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="node"></param>
+        /// <param name="attributeName"></param>
+        /// <returns></returns>
+        public static BOOTSTRAPPER_CACHE_TYPE? GetCacheTypeAttribute(XPathNavigator node, string attributeName)
+        {
+            string attributeValue = BootstrapperApplicationData.GetAttribute(node, attributeName);
+            if (attributeValue == null)
+            {
+                return null;
+            }
+            if (attributeValue.Equals("keep", StringComparison.InvariantCulture))
+            {
+                return BOOTSTRAPPER_CACHE_TYPE.Keep;
+            }
+            else if (attributeValue.Equals("force", StringComparison.InvariantCulture))
+            {
+                return BOOTSTRAPPER_CACHE_TYPE.Force;
+            }
+            else
+            {
+                return BOOTSTRAPPER_CACHE_TYPE.Remove;
+            }
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="node"></param>
+        /// <param name="attributeName"></param>
+        /// <returns></returns>
+        public static PackageType? GetPackageTypeAttribute(XPathNavigator node, string attributeName)
+        {
+            string attributeValue = BootstrapperApplicationData.GetAttribute(node, attributeName);
+            if (attributeValue == null)
+            {
+                return null;
+            }
+            if (attributeValue.Equals("Exe", StringComparison.InvariantCulture))
+            {
+                return PackageType.Exe;
+            }
+            else if (attributeValue.Equals("Msi", StringComparison.InvariantCulture))
+            {
+                return PackageType.Msi;
+            }
+            else if (attributeValue.Equals("Msp", StringComparison.InvariantCulture))
+            {
+                return PackageType.Msp;
+            }
+            else if (attributeValue.Equals("Msu", StringComparison.InvariantCulture))
+            {
+                return PackageType.Msu;
+            }
+            else
+            {
+                return PackageType.Unknown;
+            }
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="id"></param>
+        /// <param name="relationType"></param>
+        /// <param name="perMachine"></param>
+        /// <param name="version"></param>
+        /// <returns></returns>
+        public static IPackageInfo GetRelatedBundleAsPackage(string id, RelationType relationType, bool perMachine, string version)
+        {
+            PackageInfo package = new PackageInfo();
+            package.Id = id;
+            package.Version = version;
+            switch (relationType)
+            {
+                case RelationType.Addon:
+                    package.Type = PackageType.AddonBundle;
+                    break;
+                case RelationType.Patch:
+                    package.Type = PackageType.PatchBundle;
+                    break;
+                case RelationType.Upgrade:
+                    package.Type = PackageType.UpgradeBundle;
+                    break;
+                default:
+                    throw new Exception(string.Format("Unknown related bundle type: {0}", relationType));
+            }
+            return package;
+        }
+        internal static void ParseBalPackageInfoFromXml(XPathNavigator root, XmlNamespaceManager namespaceManager, Dictionary<string, IPackageInfo> packagesById)
+        {
+            XPathNodeIterator nodes = root.Select("/p:BootstrapperApplicationData/p:WixBalPackageInfo", namespaceManager);
+            foreach (XPathNavigator node in nodes)
+            {
+                string id = BootstrapperApplicationData.GetAttribute(node, "PackageId");
+                if (id == null)
+                {
+                    throw new Exception("Failed to get package identifier for WixBalPackageInfo.");
+                }
+                if (!packagesById.TryGetValue(id, out var ipackage))
+                {
+                    throw new Exception(string.Format("Failed to find package specified in WixBalPackageInfo: {0}", id));
+                }
+                var package = (PackageInfo)ipackage;
+                package.DisplayInternalUICondition = BootstrapperApplicationData.GetAttribute(node, "DisplayInternalUICondition");
+            }
+            nodes = root.Select("/p:BootstrapperApplicationData/p:WixMbaPrereqInformation", namespaceManager);
+            foreach (XPathNavigator node in nodes)
+            {
+                string id = BootstrapperApplicationData.GetAttribute(node, "PackageId");
+                if (id == null)
+                {
+                    throw new Exception("Failed to get package identifier for WixMbaPrereqInformation.");
+                }
+                if (!packagesById.TryGetValue(id, out var ipackage))
+                {
+                    throw new Exception(string.Format("Failed to find package specified in WixMbaPrereqInformation: {0}", id));
+                }
+                var package = (PackageInfo)ipackage;
+                package.PrereqPackage = true;
+                package.PrereqLicenseFile = BootstrapperApplicationData.GetAttribute(node, "LicenseFile");
+                package.PrereqLicenseUrl = BootstrapperApplicationData.GetAttribute(node, "LicenseUrl");
+            }
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/VerUtil.cs b/src/api/burn/WixToolset.Mba.Core/VerUtil.cs
new file mode 100644
index 00000000..81c5b716
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/VerUtil.cs
@@ -0,0 +1,145 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    using System.Text;
+    /// <summary>
+    /// Managed wrapper for verutil.
+    /// </summary>
+    public static class VerUtil
+    {
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern int VerCompareParsedVersions(
+            VersionHandle pVersion1,
+            VersionHandle pVersion2
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern int VerCompareStringVersions(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion1,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion2,
+            [MarshalAs(UnmanagedType.Bool)] bool fStrict
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern VersionHandle VerCopyVersion(
+            VersionHandle pSource
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true)]
+        internal static extern void VerFreeVersion(
+            IntPtr pVersion
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern VersionHandle VerParseVersion(
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
+            [MarshalAs(UnmanagedType.U4)] uint cchValue,
+            [MarshalAs(UnmanagedType.Bool)] bool fStrict
+            );
+        [DllImport("mbanative.dll", ExactSpelling = true, PreserveSig = false)]
+        internal static extern VersionHandle VerVersionFromQword(
+            [MarshalAs(UnmanagedType.I8)] long qwVersion
+            );
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct VersionReleaseLabelStruct
+        {
+            public bool fNumeric;
+            public uint dwValue;
+            public IntPtr cchLabelOffset;
+            public int cchLabel;
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        internal struct VersionStruct
+        {
+            public IntPtr sczVersion;
+            public uint dwMajor;
+            public uint dwMinor;
+            public uint dwPatch;
+            public uint dwRevision;
+            public int cReleaseLabels;
+            public IntPtr rgReleaseLabels;
+            public IntPtr cchMetadataOffset;
+            public bool fInvalid;
+        }
+        internal static string VersionStringFromOffset(IntPtr wzVersion, IntPtr cchOffset, int? cchLength = null)
+        {
+            var offset = cchOffset.ToInt64() * UnicodeEncoding.CharSize;
+            var wz = new IntPtr(wzVersion.ToInt64() + offset);
+            if (cchLength.HasValue)
+            {
+                return Marshal.PtrToStringUni(wz, (int)cchLength);
+            }
+            else
+            {
+                return Marshal.PtrToStringUni(wz);
+            }
+        }
+        internal sealed class VersionHandle : SafeHandle
+        {
+            public VersionHandle() : base(IntPtr.Zero, true) { }
+            public override bool IsInvalid => false;
+            protected override bool ReleaseHandle()
+            {
+                VerFreeVersion(this.handle);
+                return true;
+            }
+        }
+        /// <returns>0 if equal, 1 if version1 &gt; version2, -1 if version1 &lt; version2</returns>
+        public static int CompareParsedVersions(VerUtilVersion version1, VerUtilVersion version2)
+        {
+            return VerCompareParsedVersions(version1.GetHandle(), version2.GetHandle());
+        }
+        /// <returns>0 if equal, 1 if version1 &gt; version2, -1 if version1 &lt; version2</returns>
+        public static int CompareStringVersions(string version1, string version2, bool strict)
+        {
+            return VerCompareStringVersions(version1, version2, strict);
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="version"></param>
+        /// <returns></returns>
+        public static VerUtilVersion CopyVersion(VerUtilVersion version)
+        {
+            var handle = VerCopyVersion(version.GetHandle());
+            return new VerUtilVersion(handle);
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="version"></param>
+        /// <param name="strict">Whether to throw exception on invalid version.</param>
+        /// <returns></returns>
+        public static VerUtilVersion ParseVersion(string version, bool strict)
+        {
+            var handle = VerParseVersion(version, 0, strict);
+            return new VerUtilVersion(handle);
+        }
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="version"></param>
+        /// <returns></returns>
+        public static VerUtilVersion VersionFromQword(long version)
+        {
+            var handle = VerVersionFromQword(version);
+            return new VerUtilVersion(handle);
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/VerUtilVersion.cs b/src/api/burn/WixToolset.Mba.Core/VerUtilVersion.cs
new file mode 100644
index 00000000..7408c26f
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/VerUtilVersion.cs
@@ -0,0 +1,99 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// An enhanced implementation of SemVer 2.0.
+    /// </summary>
+    public sealed class VerUtilVersion : IDisposable
+    {
+        internal VerUtilVersion(VerUtil.VersionHandle handle)
+        {
+            this.Handle = handle;
+            var pVersion = handle.DangerousGetHandle();
+            var version = (VerUtil.VersionStruct)Marshal.PtrToStructure(pVersion, typeof(VerUtil.VersionStruct));
+            this.Version = Marshal.PtrToStringUni(version.sczVersion);
+            this.Major = version.dwMajor;
+            this.Minor = version.dwMinor;
+            this.Patch = version.dwPatch;
+            this.Revision = version.dwRevision;
+            this.ReleaseLabels = new VerUtilVersionReleaseLabel[version.cReleaseLabels];
+            this.Metadata = VerUtil.VersionStringFromOffset(version.sczVersion, version.cchMetadataOffset);
+            this.IsInvalid = version.fInvalid;
+            for (var i = 0; i < version.cReleaseLabels; ++i)
+            {
+                var offset = i * Marshal.SizeOf(typeof(VerUtil.VersionReleaseLabelStruct));
+                var pReleaseLabel = new IntPtr(version.rgReleaseLabels.ToInt64() + offset);
+                this.ReleaseLabels[i] = new VerUtilVersionReleaseLabel(pReleaseLabel, version.sczVersion);
+            }
+        }
+        /// <summary>
+        /// String version, which would have stripped the leading 'v'.
+        /// </summary>
+        public string Version { get; private set; }
+        /// <summary>
+        /// For version A.B.C.D, Major is A. It is 0 if not specified.
+        /// </summary>
+        public uint Major { get; private set; }
+        /// <summary>
+        /// For version A.B.C.D, Minor is B. It is 0 if not specified.
+        /// </summary>
+        public uint Minor { get; private set; }
+        /// <summary>
+        /// For version A.B.C.D, Patch is C. It is 0 if not specified.
+        /// </summary>
+        public uint Patch { get; private set; }
+        /// <summary>
+        /// For version A.B.C.D, Revision is D. It is 0 if not specified.
+        /// </summary>
+        public uint Revision { get; private set; }
+        /// <summary>
+        /// For version X.Y.Z-releaselabels+metadata, ReleaseLabels is the parsed information for releaselabels.
+        /// </summary>
+        public VerUtilVersionReleaseLabel[] ReleaseLabels { get; private set; }
+        /// <summary>
+        /// For version X.Y.Z-releaselabels+metadata, Metadata is the rest of the string after +.
+        /// For invalid versions, it is all of the string after the point where it was an invalid string.
+        /// </summary>
+        public string Metadata { get; private set; }
+        /// <summary>
+        /// Whether the version conformed to the spec.
+        /// </summary>
+        public bool IsInvalid { get; private set; }
+        /// <inheritdoc/>
+        public void Dispose()
+        {
+            if (this.Handle != null)
+            {
+                this.Handle.Dispose();
+                this.Handle = null;
+            }
+        }
+        private VerUtil.VersionHandle Handle { get; set; }
+        internal VerUtil.VersionHandle GetHandle()
+        {
+            if (this.Handle == null)
+            {
+                throw new ObjectDisposedException(this.Version);
+            }
+            return this.Handle;
+        }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/VerUtilVersionReleaseLabel.cs b/src/api/burn/WixToolset.Mba.Core/VerUtilVersionReleaseLabel.cs
new file mode 100644
index 00000000..97e8190d
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/VerUtilVersionReleaseLabel.cs
@@ -0,0 +1,36 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolset.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    /// <summary>
+    /// A release label from a <see cref="VerUtilVersion"/>.
+    /// </summary>
+    public sealed class VerUtilVersionReleaseLabel
+    {
+        internal VerUtilVersionReleaseLabel(IntPtr pReleaseLabel, IntPtr wzVersion)
+        {
+            var releaseLabel = (VerUtil.VersionReleaseLabelStruct)Marshal.PtrToStructure(pReleaseLabel, typeof(VerUtil.VersionReleaseLabelStruct));
+            this.IsNumeric = releaseLabel.fNumeric;
+            this.Value = releaseLabel.dwValue;
+            this.Label = VerUtil.VersionStringFromOffset(wzVersion, releaseLabel.cchLabelOffset, releaseLabel.cchLabel);
+        }
+        /// <summary>
+        /// Whether the label was parsed as a number.
+        /// </summary>
+        public bool IsNumeric { get; private set; }
+        /// <summary>
+        /// If <see cref="IsNumeric"/> then the value that was parsed.
+        /// </summary>
+        public uint Value { get; private set; }
+        /// <summary>
+        /// The string version of the label.
+        /// </summary>
+        public string Label { get; private set; }
+    }
+}
diff --git a/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.csproj b/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.csproj
new file mode 100644
index 00000000..2bd7ca80
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.csproj
@@ -0,0 +1,59 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFrameworks>netstandard2.0;net20</TargetFrameworks>
+    <AssemblyName>WixToolset.Mba.Core</AssemblyName>
+    <RootNamespace>WixToolset.Mba.Core</RootNamespace>
+    <DebugType>embedded</DebugType>
+    <Description>Managed Bootstrapper Application Core</Description>
+    <NuspecFile>$(MSBuildThisFileName).nuspec</NuspecFile>
+    <IncludeSymbols>true</IncludeSymbols>
+    <CreateDocumentationFile>true</CreateDocumentationFile>
+  </PropertyGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0" PrivateAssets="All" />
+    <PackageReference Include="Nerdbank.GitVersioning" Version="3.3.37" PrivateAssets="All" />
+  </ItemGroup>
+  <PropertyGroup>
+    <NuspecBasePath>$(OutputPath)</NuspecBasePath>
+    <NativeFileListPath Condition=" '$(NCrunch)'=='' ">$(MSBuildProjectDir)..\..\build\obj\$(ProjectName)\$(Configuration)\NativeFileList.txt</NativeFileListPath>
+    <NativeFileListPath Condition=" '$(NCrunch)'=='1' ">$(NCrunchOriginalProjectDir)..\..\build\obj\$(ProjectName)\$(Configuration)\NativeFileList.txt</NativeFileListPath>
+  </PropertyGroup>
+  <Target Name="BuildMbaNative" BeforeTargets="GetCopyToOutputDirectoryItems" Condition=" '$(NCrunch)'=='' ">
+    <MSBuild Projects="..\mbanative\mbanative.vcxproj" Properties="Platform=Win32" Targets="Build;BuiltProjectOutputGroup;ContentFilesProjectOutputGroup;DebugSymbolsProjectOutputGroup">
+      <Output TaskParameter="TargetOutputs" ItemName="_NativeProjectOutput" />
+    </MSBuild>
+    <WriteLinesToFile File="$(NativeFileListPath)" Lines="@(_NativeProjectOutput)" Overwrite="true" />
+    <ItemGroup>
+      <FileWrites Include="$(NativeFileListPath)" />
+      <AllItemsFullPathWithTargetPath Include="@(_NativeProjectOutput->'%(FullPath)')">
+        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+        <TargetPath>%(Filename)%(Extension)</TargetPath>
+      </AllItemsFullPathWithTargetPath>
+    </ItemGroup>
+  </Target>
+  <Target Name="NCrunchCopyNative" AfterTargets="AfterBuild" Condition=" '$(NCrunch)'=='1' ">
+    <ReadLinesFromFile File="$(NativeFileListPath)">
+      <Output TaskParameter="Lines" ItemName="_NCrunchNativeProjectOutput" />
+    </ReadLinesFromFile>
+    <Error Text="You must build $(MSBuildProjectName) to create the referenced native projects. Once built, 'Reload and rebuild' the project in the NCrunch Tests. The $(NativeFileListPath) file must not be empty." Condition=" '@(_NCrunchNativeProjectOutput)'=='' " />
+    <Copy SourceFiles="@(_NCrunchNativeProjectOutput)" DestinationFolder="$(OutputPath)" SkipUnchangedFiles="true">
+      <Output TaskParameter="CopiedFiles" ItemName="_NCrunchNativeCopied" />
+    </Copy>
+    <ItemGroup>
+      <FileWrites Include="@(_NCrunchNativeCopied)" />
+    </ItemGroup>
+  </Target>
+</Project>
diff --git a/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.nuspec b/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.nuspec
new file mode 100644
index 00000000..a5e09ea9
--- /dev/null
+++ b/src/api/burn/WixToolset.Mba.Core/WixToolset.Mba.Core.nuspec
@@ -0,0 +1,33 @@
+<?xml version="1.0"?>
+<package xmlns="http://schemas.microsoft.com/packaging/2010/07/nuspec.xsd">
+  <metadata minClientVersion="4.0">
+    <id>$id$</id>
+    <version>$version$</version>
+    <authors>$authors$</authors>
+    <owners>$authors$</owners>
+    <license type="expression">MS-RL</license>
+    <projectUrl>https://github.com/wixtoolset/balutil</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>$description$</description>
+    <copyright>$copyright$</copyright>
+    <repository type="$repositorytype$" url="$repositoryurl$" commit="$repositorycommit$" />
+    <dependencies>
+      <group targetFramework=".NETFramework2.0" />
+      <group targetFramework=".NETStandard2.0" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="net20\$id$.dll" target="lib\net20" />
+    <file src="net20\$id$.xml" target="lib\net20" />
+    <file src="netstandard2.0\$id$.dll" target="lib\netstandard2.0" />
+    <file src="netstandard2.0\$id$.xml" target="lib\netstandard2.0" />
+    <file src="v142\ARM64\mbanative.dll" target="runtimes\win-arm64\native" />
+    <file src="v142\ARM64\mbanative.pdb" target="runtimes\win-arm64\native" />
+    <file src="v142\x64\mbanative.dll" target="runtimes\win-x64\native" />
+    <file src="v142\x64\mbanative.pdb" target="runtimes\win-x64\native" />
+    <file src="v142\x86\mbanative.dll" target="runtimes\win-x86\native" />
+    <file src="v142\x86\mbanative.pdb" target="runtimes\win-x86\native" />
+  </files>
+</package>
diff --git a/src/api/burn/appveyor.cmd b/src/api/burn/appveyor.cmd
new file mode 100644
index 00000000..26f75243
--- /dev/null
+++ b/src/api/burn/appveyor.cmd
@@ -0,0 +1,27 @@
+@setlocal
+@pushd %~dp0
+@set _C=Release
+@if /i "%1"=="debug" set _C=Debug
+nuget restore || exit /b
+msbuild -p:Configuration=%_C%;Platform=x86;PlatformToolset=v140 || exit /b
+msbuild -p:Configuration=%_C%;Platform=x64;PlatformToolset=v140 || exit /b
+msbuild -p:Configuration=%_C%;Platform=x86;PlatformToolset=v141 || exit /b
+msbuild -p:Configuration=%_C%;Platform=x64;PlatformToolset=v141 || exit /b
+msbuild -p:Configuration=%_C%;Platform=ARM64;PlatformToolset=v141 || exit /b
+msbuild -p:Configuration=%_C%;Platform=x86;PlatformToolset=v142 || exit /b
+msbuild -p:Configuration=%_C%;Platform=x64;PlatformToolset=v142 || exit /b
+msbuild -p:Configuration=%_C%;Platform=ARM64;PlatformToolset=v142 || exit /b
+dotnet test -c %_C% --no-build src\test\WixToolsetTest.Mba.Core\WixToolsetTest.Mba.Core.csproj || exit /b
+msbuild -t:PackNative -p:Configuration=%_C% src\balutil\balutil.vcxproj || exit /b
+msbuild -t:PackNative -p:Configuration=%_C% src\bextutil\bextutil.vcxproj || exit /b
+msbuild -t:PackNative -p:Configuration=%_C% src\WixToolset.BootstrapperCore.Native\WixToolset.BootstrapperCore.Native.proj || exit /b
+msbuild -t:Pack -p:Configuration=%_C% -p:NoBuild=true src\WixToolset.Mba.Core\WixToolset.Mba.Core.csproj || exit /b
+@popd
+@endlocal
+\ No newline at end of file
diff --git a/src/api/burn/appveyor.yml b/src/api/burn/appveyor.yml
new file mode 100644
index 00000000..e4d25586
--- /dev/null
+++ b/src/api/burn/appveyor.yml
@@ -0,0 +1,42 @@
+# Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#
+#  Do NOT modify this file. Update the canonical version in Home\repo-template\src\appveyor.yml
+#  then update all of the repos.
+branches:
+  only:
+    - master
+    - develop
+image: Visual Studio 2019
+version: 0.0.0.{build}
+configuration: Release
+environment:
+  DOTNET_SKIP_FIRST_TIME_EXPERIENCE: true
+  DOTNET_CLI_TELEMETRY_OPTOUT: 1
+  NUGET_XMLDOC_MODE: skip
+build_script:
+  - appveyor.cmd
+test: off
+pull_requests:
+  do_not_increment_build_number: true
+nuget:
+  disable_publish_on_pr: true
+skip_branch_with_pr: true
+skip_tags: true
+artifacts:
+- path: build\Release\**\*.nupkg
+  name: nuget
+notifications:
+- provider: Slack
+  incoming_webhook:
+    secure: p5xuu+4x2JHfwGDMDe5KcG1k7gZxqYc4jWVwvyNZv5cvkubPD2waJs5yXMAXZNN7Z63/3PWHb7q4KoY/99AjauYa1nZ4c5qYqRPFRBKTHfA=
diff --git a/src/api/burn/balutil.sln b/src/api/burn/balutil.sln
new file mode 100644
index 00000000..cae580f3
--- /dev/null
+++ b/src/api/burn/balutil.sln
@@ -0,0 +1,113 @@
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29503.13
+MinimumVisualStudioVersion = 15.0.26124.0
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "balutil", "src\balutil\balutil.vcxproj", "{EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "bextutil", "src\bextutil\bextutil.vcxproj", "{06027492-1CB9-48BC-B31E-C1F9356ED07E}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WixToolset.Mba.Core", "src\WixToolset.Mba.Core\WixToolset.Mba.Core.csproj", "{E7E1841E-A58E-4901-B9CA-4845B807D45F}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "mbanative", "src\mbanative\mbanative.vcxproj", "{665E0441-17F9-4105-B202-EDF274657F6E}"
+EndProject
+Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WixToolsetTest.Mba.Core", "src\test\WixToolsetTest.Mba.Core\WixToolsetTest.Mba.Core.csproj", "{F54997F7-10D7-409B-B9F2-DB546490EDC0}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "BalUtilUnitTest", "src\test\BalUtilUnitTest\BalUtilUnitTest.vcxproj", "{9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}"
+EndProject
+Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "BextUtilUnitTest", "src\test\BextUtilUnitTest\BextUtilUnitTest.vcxproj", "{B69E6422-49B0-4E28-92F9-B8A7410A6ED9}"
+EndProject
+Global
+        GlobalSection(SolutionConfigurationPlatforms) = preSolution
+                Debug|ARM64 = Debug|ARM64
+                Debug|x64 = Debug|x64
+                Debug|x86 = Debug|x86
+                Release|ARM64 = Release|ARM64
+                Release|x64 = Release|x64
+                Release|x86 = Release|x86
+        EndGlobalSection
+        GlobalSection(ProjectConfigurationPlatforms) = postSolution
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|ARM64.ActiveCfg = Debug|ARM64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|ARM64.Build.0 = Debug|ARM64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|x64.ActiveCfg = Debug|x64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|x64.Build.0 = Debug|x64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|x86.ActiveCfg = Debug|Win32
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Debug|x86.Build.0 = Debug|Win32
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|ARM64.ActiveCfg = Release|ARM64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|ARM64.Build.0 = Release|ARM64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|x64.ActiveCfg = Release|x64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|x64.Build.0 = Release|x64
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|x86.ActiveCfg = Release|Win32
+                {EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}.Release|x86.Build.0 = Release|Win32
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|ARM64.ActiveCfg = Debug|ARM64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|ARM64.Build.0 = Debug|ARM64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|x64.ActiveCfg = Debug|x64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|x64.Build.0 = Debug|x64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|x86.ActiveCfg = Debug|Win32
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Debug|x86.Build.0 = Debug|Win32
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|ARM64.ActiveCfg = Release|ARM64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|ARM64.Build.0 = Release|ARM64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|x64.ActiveCfg = Release|x64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|x64.Build.0 = Release|x64
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|x86.ActiveCfg = Release|Win32
+                {06027492-1CB9-48BC-B31E-C1F9356ED07E}.Release|x86.Build.0 = Release|Win32
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|ARM64.ActiveCfg = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|ARM64.Build.0 = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|x64.ActiveCfg = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|x64.Build.0 = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|x86.ActiveCfg = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Debug|x86.Build.0 = Debug|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|ARM64.ActiveCfg = Release|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|ARM64.Build.0 = Release|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|x64.ActiveCfg = Release|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|x64.Build.0 = Release|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|x86.ActiveCfg = Release|Any CPU
+                {E7E1841E-A58E-4901-B9CA-4845B807D45F}.Release|x86.Build.0 = Release|Any CPU
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|ARM64.ActiveCfg = Debug|ARM64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|ARM64.Build.0 = Debug|ARM64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|x64.ActiveCfg = Debug|x64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|x64.Build.0 = Debug|x64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|x86.ActiveCfg = Debug|Win32
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Debug|x86.Build.0 = Debug|Win32
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|ARM64.ActiveCfg = Release|ARM64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|ARM64.Build.0 = Release|ARM64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|x64.ActiveCfg = Release|x64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|x64.Build.0 = Release|x64
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|x86.ActiveCfg = Release|Win32
+                {665E0441-17F9-4105-B202-EDF274657F6E}.Release|x86.Build.0 = Release|Win32
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|ARM64.ActiveCfg = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|ARM64.Build.0 = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|x64.ActiveCfg = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|x64.Build.0 = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|x86.ActiveCfg = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Debug|x86.Build.0 = Debug|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|ARM64.ActiveCfg = Release|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|ARM64.Build.0 = Release|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|x64.ActiveCfg = Release|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|x64.Build.0 = Release|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|x86.ActiveCfg = Release|Any CPU
+                {F54997F7-10D7-409B-B9F2-DB546490EDC0}.Release|x86.Build.0 = Release|Any CPU
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Debug|ARM64.ActiveCfg = Debug|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Debug|x64.ActiveCfg = Debug|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Debug|x86.ActiveCfg = Debug|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Debug|x86.Build.0 = Debug|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Release|ARM64.ActiveCfg = Release|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Release|x64.ActiveCfg = Release|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Release|x86.ActiveCfg = Release|Win32
+                {9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}.Release|x86.Build.0 = Release|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Debug|ARM64.ActiveCfg = Debug|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Debug|x64.ActiveCfg = Debug|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Debug|x86.ActiveCfg = Debug|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Debug|x86.Build.0 = Debug|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Release|ARM64.ActiveCfg = Release|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Release|x64.ActiveCfg = Release|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Release|x86.ActiveCfg = Release|Win32
+                {B69E6422-49B0-4E28-92F9-B8A7410A6ED9}.Release|x86.Build.0 = Release|Win32
+        EndGlobalSection
+        GlobalSection(SolutionProperties) = preSolution
+                HideSolutionNode = FALSE
+        EndGlobalSection
+        GlobalSection(ExtensibilityGlobals) = postSolution
+                SolutionGuid = {8741FA43-6BD2-40F9-ABA5-A5BD466A6518}
+        EndGlobalSection
+EndGlobal
diff --git a/src/api/burn/balutil/BalBootstrapperEngine.cpp b/src/api/burn/balutil/BalBootstrapperEngine.cpp
new file mode 100644
index 00000000..301b88a5
--- /dev/null
+++ b/src/api/burn/balutil/BalBootstrapperEngine.cpp
@@ -0,0 +1,629 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+class CBalBootstrapperEngine : public IBootstrapperEngine
+{
+public: // IUnknown
+    virtual STDMETHODIMP QueryInterface(
+        __in REFIID riid,
+        __out LPVOID *ppvObject
+        )
+    {
+        if (!ppvObject)
+        {
+            return E_INVALIDARG;
+        }
+        *ppvObject = NULL;
+        if (::IsEqualIID(__uuidof(IBootstrapperEngine), riid))
+        {
+            *ppvObject = static_cast<IBootstrapperEngine*>(this);
+        }
+        else if (::IsEqualIID(IID_IMarshal, riid))
+        {
+            return m_pFreeThreadedMarshaler->QueryInterface(riid, ppvObject);
+        }
+        else if (::IsEqualIID(IID_IUnknown, riid))
+        {
+            *ppvObject = reinterpret_cast<IUnknown*>(this);
+        }
+        else // no interface for requested iid
+        {
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+    virtual STDMETHODIMP_(ULONG) AddRef()
+    {
+        return ::InterlockedIncrement(&this->m_cReferences);
+    }
+    virtual STDMETHODIMP_(ULONG) Release()
+    {
+        long l = ::InterlockedDecrement(&this->m_cReferences);
+        if (0 < l)
+        {
+            return l;
+        }
+        delete this;
+        return 0;
+    }
+public: // IBootstrapperEngine
+    virtual STDMETHODIMP GetPackageCount(
+        __out DWORD* pcPackages
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_GETPACKAGECOUNT_ARGS args = { };
+        BAENGINE_GETPACKAGECOUNT_RESULTS results = { };
+        ExitOnNull(pcPackages, hr, E_INVALIDARG, "pcPackages is required");
+        args.cbSize = sizeof(args);
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_GETPACKAGECOUNT, &args, &results, m_pvBAEngineProcContext);
+        *pcPackages = results.cPackages;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableNumeric(
+        __in_z LPCWSTR wzVariable,
+        __out LONGLONG* pllValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_GETVARIABLENUMERIC_ARGS args = { };
+        BAENGINE_GETVARIABLENUMERIC_RESULTS results = { };
+        ExitOnNull(pllValue, hr, E_INVALIDARG, "pllValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLENUMERIC, &args, &results, m_pvBAEngineProcContext);
+        *pllValue = results.llValue;
+    LExit:
+        SecureZeroMemory(&results, sizeof(results));
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableString(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_GETVARIABLESTRING_ARGS args = { };
+        BAENGINE_GETVARIABLESTRING_RESULTS results = { };
+        ExitOnNull(pcchValue, hr, E_INVALIDARG, "pcchValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        results.wzValue = wzValue;
+        results.cchValue = *pcchValue;
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLESTRING, &args, &results, m_pvBAEngineProcContext);
+        *pcchValue = results.cchValue;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableVersion(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_GETVARIABLEVERSION_ARGS args = { };
+        BAENGINE_GETVARIABLEVERSION_RESULTS results = { };
+        ExitOnNull(pcchValue, hr, E_INVALIDARG, "pcchValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        results.wzValue = wzValue;
+        results.cchValue = *pcchValue;
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_GETVARIABLEVERSION, &args, &results, m_pvBAEngineProcContext);
+        *pcchValue = results.cchValue;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP FormatString(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_FORMATSTRING_ARGS args = { };
+        BAENGINE_FORMATSTRING_RESULTS results = { };
+        ExitOnNull(pcchOut, hr, E_INVALIDARG, "pcchOut is required");
+        args.cbSize = sizeof(args);
+        args.wzIn = wzIn;
+        results.cbSize = sizeof(results);
+        results.wzOut = wzOut;
+        results.cchOut = *pcchOut;
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_FORMATSTRING, &args, &results, m_pvBAEngineProcContext);
+        *pcchOut = results.cchOut;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP EscapeString(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_ESCAPESTRING_ARGS args = { };
+        BAENGINE_ESCAPESTRING_RESULTS results = { };
+        ExitOnNull(pcchOut, hr, E_INVALIDARG, "pcchOut is required");
+        args.cbSize = sizeof(args);
+        args.wzIn = wzIn;
+        results.cbSize = sizeof(results);
+        results.wzOut = wzOut;
+        results.cchOut = *pcchOut;
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_ESCAPESTRING, &args, &results, m_pvBAEngineProcContext);
+        *pcchOut = results.cchOut;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP EvaluateCondition(
+        __in_z LPCWSTR wzCondition,
+        __out BOOL* pf
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_EVALUATECONDITION_ARGS args = { };
+        BAENGINE_EVALUATECONDITION_RESULTS results = { };
+        ExitOnNull(pf, hr, E_INVALIDARG, "pf is required");
+        args.cbSize = sizeof(args);
+        args.wzCondition = wzCondition;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_EVALUATECONDITION, &args, &results, m_pvBAEngineProcContext);
+        *pf = results.f;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP Log(
+        __in BOOTSTRAPPER_LOG_LEVEL level,
+        __in_z LPCWSTR wzMessage
+        )
+    {
+        BAENGINE_LOG_ARGS args = { };
+        BAENGINE_LOG_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.level = level;
+        args.wzMessage = wzMessage;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_LOG, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SendEmbeddedError(
+        __in DWORD dwErrorCode,
+        __in_z_opt LPCWSTR wzMessage,
+        __in DWORD dwUIHint,
+        __out int* pnResult
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_SENDEMBEDDEDERROR_ARGS args = { };
+        BAENGINE_SENDEMBEDDEDERROR_RESULTS results = { };
+        ExitOnNull(pnResult, hr, E_INVALIDARG, "pnResult is required");
+        args.cbSize = sizeof(args);
+        args.dwErrorCode = dwErrorCode;
+        args.wzMessage = wzMessage;
+        args.dwUIHint = dwUIHint;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SENDEMBEDDEDERROR, &args, &results, m_pvBAEngineProcContext);
+        *pnResult = results.nResult;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP SendEmbeddedProgress(
+        __in DWORD dwProgressPercentage,
+        __in DWORD dwOverallProgressPercentage,
+        __out int* pnResult
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_SENDEMBEDDEDPROGRESS_ARGS args = { };
+        BAENGINE_SENDEMBEDDEDPROGRESS_RESULTS results = { };
+        ExitOnNull(pnResult, hr, E_INVALIDARG, "pnResult is required");
+        args.cbSize = sizeof(args);
+        args.dwProgressPercentage = dwProgressPercentage;
+        args.dwOverallProgressPercentage = dwOverallProgressPercentage;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SENDEMBEDDEDPROGRESS, &args, &results, m_pvBAEngineProcContext);
+        *pnResult = results.nResult;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP SetUpdate(
+        __in_z_opt LPCWSTR wzLocalSource,
+        __in_z_opt LPCWSTR wzDownloadSource,
+        __in DWORD64 qwSize,
+        __in BOOTSTRAPPER_UPDATE_HASH_TYPE hashType,
+        __in_bcount_opt(cbHash) BYTE* rgbHash,
+        __in DWORD cbHash
+        )
+    {
+        BAENGINE_SETUPDATE_ARGS args = { };
+        BAENGINE_SETUPDATE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzLocalSource = wzLocalSource;
+        args.wzDownloadSource = wzDownloadSource;
+        args.qwSize = qwSize;
+        args.hashType = hashType;
+        args.rgbHash = rgbHash;
+        args.cbHash = cbHash;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETUPDATE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetLocalSource(
+        __in_z LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR wzPath
+        )
+    {
+        BAENGINE_SETLOCALSOURCE_ARGS args = { };
+        BAENGINE_SETLOCALSOURCE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzPackageOrContainerId = wzPackageOrContainerId;
+        args.wzPayloadId = wzPayloadId;
+        args.wzPath = wzPath;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETLOCALSOURCE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetDownloadSource(
+        __in_z LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR wzUrl,
+        __in_z_opt LPCWSTR wzUser,
+        __in_z_opt LPCWSTR wzPassword
+        )
+    {
+        BAENGINE_SETDOWNLOADSOURCE_ARGS args = { };
+        BAENGINE_SETDOWNLOADSOURCE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzPackageOrContainerId = wzPackageOrContainerId;
+        args.wzPayloadId = wzPayloadId;
+        args.wzUrl = wzUrl;
+        args.wzUser = wzUser;
+        args.wzPassword = wzPassword;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETDOWNLOADSOURCE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableNumeric(
+        __in_z LPCWSTR wzVariable,
+        __in LONGLONG llValue
+        )
+    {
+        BAENGINE_SETVARIABLENUMERIC_ARGS args = { };
+        BAENGINE_SETVARIABLENUMERIC_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.llValue = llValue;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLENUMERIC, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableString(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue,
+        __in BOOL fFormatted
+        )
+    {
+        BAENGINE_SETVARIABLESTRING_ARGS args = { };
+        BAENGINE_SETVARIABLESTRING_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.wzValue = wzValue;
+        args.fFormatted = fFormatted;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLESTRING, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableVersion(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue
+        )
+    {
+        BAENGINE_SETVARIABLEVERSION_ARGS args = { };
+        BAENGINE_SETVARIABLEVERSION_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.wzValue = wzValue;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETVARIABLEVERSION, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP CloseSplashScreen()
+    {
+        BAENGINE_CLOSESPLASHSCREEN_ARGS args = { };
+        BAENGINE_CLOSESPLASHSCREEN_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_CLOSESPLASHSCREEN, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP Detect(
+        __in_opt HWND hwndParent
+        )
+    {
+        BAENGINE_DETECT_ARGS args = { };
+        BAENGINE_DETECT_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.hwndParent = hwndParent;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_DETECT, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP Plan(
+        __in BOOTSTRAPPER_ACTION action
+        )
+    {
+        BAENGINE_PLAN_ARGS args = { };
+        BAENGINE_PLAN_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.action = action;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_PLAN, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP Elevate(
+        __in_opt HWND hwndParent
+        )
+    {
+        BAENGINE_ELEVATE_ARGS args = { };
+        BAENGINE_ELEVATE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.hwndParent = hwndParent;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_ELEVATE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP Apply(
+        __in HWND hwndParent
+        )
+    {
+        BAENGINE_APPLY_ARGS args = { };
+        BAENGINE_APPLY_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.hwndParent = hwndParent;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_APPLY, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP Quit(
+        __in DWORD dwExitCode
+        )
+    {
+        BAENGINE_QUIT_ARGS args = { };
+        BAENGINE_QUIT_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.dwExitCode = dwExitCode;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_QUIT, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP LaunchApprovedExe(
+        __in_opt HWND hwndParent,
+        __in_z LPCWSTR wzApprovedExeForElevationId,
+        __in_z_opt LPCWSTR wzArguments,
+        __in DWORD dwWaitForInputIdleTimeout
+        )
+    {
+        BAENGINE_LAUNCHAPPROVEDEXE_ARGS args = { };
+        BAENGINE_LAUNCHAPPROVEDEXE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.hwndParent = hwndParent;
+        args.wzApprovedExeForElevationId = wzApprovedExeForElevationId;
+        args.wzArguments = wzArguments;
+        args.dwWaitForInputIdleTimeout = dwWaitForInputIdleTimeout;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_LAUNCHAPPROVEDEXE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP SetUpdateSource(
+        __in_z LPCWSTR wzUrl
+        )
+    {
+        BAENGINE_SETUPDATESOURCE_ARGS args = { };
+        BAENGINE_SETUPDATESOURCE_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzUrl = wzUrl;
+        results.cbSize = sizeof(results);
+        return m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_SETUPDATESOURCE, &args, &results, m_pvBAEngineProcContext);
+    }
+    virtual STDMETHODIMP CompareVersions(
+        __in_z LPCWSTR wzVersion1,
+        __in_z LPCWSTR wzVersion2,
+        __out int* pnResult
+        )
+    {
+        HRESULT hr = S_OK;
+        BAENGINE_COMPAREVERSIONS_ARGS args = { };
+        BAENGINE_COMPAREVERSIONS_RESULTS results = { };
+        ExitOnNull(pnResult, hr, E_INVALIDARG, "pnResult is required");
+        args.cbSize = sizeof(args);
+        args.wzVersion1 = wzVersion1;
+        args.wzVersion2 = wzVersion2;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBAEngineProc(BOOTSTRAPPER_ENGINE_MESSAGE_COMPAREVERSIONS, &args, &results, m_pvBAEngineProcContext);
+        *pnResult = results.nResult;
+    LExit:
+        return hr;
+    }
+public:
+    HRESULT Init()
+    {
+        return ::CoCreateFreeThreadedMarshaler(this, &m_pFreeThreadedMarshaler);
+    }
+    CBalBootstrapperEngine(
+        __in PFN_BOOTSTRAPPER_ENGINE_PROC pfnBAEngineProc,
+        __in_opt LPVOID pvBAEngineProcContext
+        )
+    {
+        m_cReferences = 1;
+        m_pfnBAEngineProc = pfnBAEngineProc;
+        m_pvBAEngineProcContext = pvBAEngineProcContext;
+        m_pFreeThreadedMarshaler = NULL;
+    }
+    ~CBalBootstrapperEngine()
+    {
+        ReleaseObject(m_pFreeThreadedMarshaler);
+    }
+private:
+    long m_cReferences;
+    PFN_BOOTSTRAPPER_ENGINE_PROC m_pfnBAEngineProc;
+    LPVOID m_pvBAEngineProcContext;
+    IUnknown* m_pFreeThreadedMarshaler;
+};
+HRESULT BalBootstrapperEngineCreate(
+    __in PFN_BOOTSTRAPPER_ENGINE_PROC pfnBAEngineProc,
+    __in_opt LPVOID pvBAEngineProcContext,
+    __out IBootstrapperEngine** ppBootstrapperEngine
+    )
+{
+    HRESULT hr = S_OK;
+    CBalBootstrapperEngine* pBootstrapperEngine = NULL;
+    pBootstrapperEngine = new CBalBootstrapperEngine(pfnBAEngineProc, pvBAEngineProcContext);
+    ExitOnNull(pBootstrapperEngine, hr, E_OUTOFMEMORY, "Failed to allocate new BalBootstrapperEngine object.");
+    hr = pBootstrapperEngine->Init();
+    ExitOnFailure(hr, "Failed to initialize CBalBootstrapperEngine.");
+    hr = pBootstrapperEngine->QueryInterface(IID_PPV_ARGS(ppBootstrapperEngine));
+    ExitOnFailure(hr, "Failed to QI for IBootstrapperEngine from BalBootstrapperEngine object.");
+LExit:
+    ReleaseObject(pBootstrapperEngine);
+    return hr;
+}
diff --git a/src/api/burn/balutil/balcondition.cpp b/src/api/burn/balutil/balcondition.cpp
new file mode 100644
index 00000000..8b05508f
--- /dev/null
+++ b/src/api/burn/balutil/balcondition.cpp
@@ -0,0 +1,124 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+// prototypes
+DAPI_(HRESULT) BalConditionsParseFromXml(
+    __in BAL_CONDITIONS* pConditions,
+    __in IXMLDOMDocument* pixdManifest,
+    __in_opt WIX_LOCALIZATION* pWixLoc
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNodeList* pNodeList = NULL;
+    IXMLDOMNode* pNode = NULL;
+    BAL_CONDITION* prgConditions = NULL;
+    DWORD cConditions = 0;
+    hr = XmlSelectNodes(pixdManifest, L"/BootstrapperApplicationData/WixBalCondition", &pNodeList);
+    ExitOnFailure(hr, "Failed to select all conditions.");
+    hr = pNodeList->get_length(reinterpret_cast<long*>(&cConditions));
+    ExitOnFailure(hr, "Failed to get the condition count.");
+    if (!cConditions)
+    {
+        ExitFunction();
+    }
+    prgConditions = static_cast<BAL_CONDITION*>(MemAlloc(sizeof(BAL_CONDITION) * cConditions, TRUE));
+    ExitOnNull(prgConditions, hr, E_OUTOFMEMORY, "Failed to allocate memory for conditions.");
+    DWORD iCondition = 0;
+    while (S_OK == (hr = XmlNextElement(pNodeList, &pNode, NULL)))
+    {
+        hr = XmlGetAttributeEx(pNode, L"Condition", &prgConditions[iCondition].sczCondition);
+        ExitOnFailure(hr, "Failed to get condition for condition.");
+        hr = XmlGetAttributeEx(pNode, L"Message", &prgConditions[iCondition].sczMessage);
+        ExitOnFailure(hr, "Failed to get message for condition.");
+        if (pWixLoc && prgConditions[iCondition].sczMessage && *prgConditions[iCondition].sczMessage)
+        {
+            hr = LocLocalizeString(pWixLoc, &prgConditions[iCondition].sczMessage);
+            ExitOnFailure(hr, "Failed to localize condition message.");
+        }
+        ++iCondition;
+        ReleaseNullObject(pNode);
+    }
+    ExitOnFailure(hr, "Failed to parse all condition elements.");
+    if (S_FALSE == hr)
+    {
+        hr = S_OK;
+    }
+    pConditions->cConditions = cConditions;
+    pConditions->rgConditions = prgConditions;
+    prgConditions = NULL;
+LExit:
+    ReleaseMem(prgConditions);
+    ReleaseObject(pNode);
+    ReleaseObject(pNodeList);
+    return hr;
+}
+//the contents of psczMessage may be sensitive, should keep encrypted and SecureZeroFree
+DAPI_(HRESULT) BalConditionEvaluate(
+    __in BAL_CONDITION* pCondition,
+    __in IBootstrapperEngine* pEngine,
+    __out BOOL* pfResult,
+    __out_z_opt LPWSTR* psczMessage
+    )
+{
+    HRESULT hr = S_OK;
+    SIZE_T cchMessage = 0;
+    hr = pEngine->EvaluateCondition(pCondition->sczCondition, pfResult);
+    ExitOnFailure(hr, "Failed to evaluate condition with bootstrapper engine.");
+    if (psczMessage)
+    {
+        if (*psczMessage)
+        {
+            hr = StrMaxLength(*psczMessage, &cchMessage);
+            ExitOnFailure(hr, "Failed to get length of message.");
+        }
+        hr = pEngine->FormatString(pCondition->sczMessage, *psczMessage, &cchMessage);
+        if (E_MOREDATA == hr)
+        {
+            ++cchMessage;
+            hr = StrAllocSecure(psczMessage, cchMessage);
+            ExitOnFailure(hr, "Failed to allocate string for condition's formatted message.");
+            hr = pEngine->FormatString(pCondition->sczMessage, *psczMessage, &cchMessage);
+        }
+        ExitOnFailure(hr, "Failed to format condition's message.");
+    }
+LExit:
+    return hr;
+}
+DAPI_(void) BalConditionsUninitialize(
+    __in BAL_CONDITIONS* pConditions
+    )
+{
+    for (DWORD i = 0; i < pConditions->cConditions; ++i)
+    {
+        ReleaseStr(pConditions->rgConditions[i].sczMessage);
+        ReleaseStr(pConditions->rgConditions[i].sczCondition);
+    }
+    ReleaseMem(pConditions->rgConditions);
+    memset(pConditions, 0, sizeof(BAL_CONDITIONS));
+}
diff --git a/src/api/burn/balutil/balinfo.cpp b/src/api/burn/balutil/balinfo.cpp
new file mode 100644
index 00000000..3abb9286
--- /dev/null
+++ b/src/api/burn/balutil/balinfo.cpp
@@ -0,0 +1,373 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+// prototypes
+static HRESULT ParsePackagesFromXml(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in IXMLDOMDocument* pixdManifest
+    );
+static HRESULT ParseBalPackageInfoFromXml(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in IXMLDOMDocument* pixdManifest
+    );
+DAPI_(HRESULT) BalInfoParseFromXml(
+    __in BAL_INFO_BUNDLE* pBundle,
+    __in IXMLDOMDocument* pixdManifest
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNode* pNode = NULL;
+    hr = XmlSelectSingleNode(pixdManifest, L"/BootstrapperApplicationData/WixBundleProperties", &pNode);
+    ExitOnFailure(hr, "Failed to select bundle information.");
+    if (S_OK == hr)
+    {
+        hr = XmlGetYesNoAttribute(pNode, L"PerMachine", &pBundle->fPerMachine);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to read bundle information per-machine.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"DisplayName", &pBundle->sczName);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to read bundle information display name.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"LogPathVariable", &pBundle->sczLogVariable);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to read bundle information log path variable.");
+        }
+    }
+    hr = ParsePackagesFromXml(&pBundle->packages, pixdManifest);
+    BalExitOnFailure(hr, "Failed to parse package information from bootstrapper application data.");
+    hr = ParseBalPackageInfoFromXml(&pBundle->packages, pixdManifest);
+    BalExitOnFailure(hr, "Failed to parse bal package information from bootstrapper application data.");
+LExit:
+    ReleaseObject(pNode);
+    return hr;
+}
+DAPI_(HRESULT) BalInfoAddRelatedBundleAsPackage(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in LPCWSTR wzId,
+    __in BOOTSTRAPPER_RELATION_TYPE relationType,
+    __in BOOL /*fPerMachine*/,
+    __out_opt BAL_INFO_PACKAGE** ppPackage
+    )
+{
+    HRESULT hr = S_OK;
+    BAL_INFO_PACKAGE_TYPE type = BAL_INFO_PACKAGE_TYPE_UNKNOWN;
+    BAL_INFO_PACKAGE* pPackage = NULL;
+    // Ensure we have a supported relation type.
+    switch (relationType)
+    {
+    case BOOTSTRAPPER_RELATION_ADDON:
+        type = BAL_INFO_PACKAGE_TYPE_BUNDLE_ADDON;
+        break;
+    case BOOTSTRAPPER_RELATION_PATCH:
+        type = BAL_INFO_PACKAGE_TYPE_BUNDLE_PATCH;
+        break;
+    case BOOTSTRAPPER_RELATION_UPGRADE:
+        type = BAL_INFO_PACKAGE_TYPE_BUNDLE_UPGRADE;
+        break;
+    default:
+        ExitOnFailure(hr = E_INVALIDARG, "Unknown related bundle type: %u", relationType);
+    }
+    // Check to see if the bundle is already in the list of packages.
+    for (DWORD i = 0; i < pPackages->cPackages; ++i)
+    {
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, wzId, -1, pPackages->rgPackages[i].sczId, -1))
+        {
+            ExitFunction1(hr = HRESULT_FROM_WIN32(ERROR_ALREADY_EXISTS));
+        }
+    }
+    // Add the related bundle as a package.
+    hr = MemEnsureArraySize(reinterpret_cast<LPVOID*>(&pPackages->rgPackages), pPackages->cPackages + 1, sizeof(BAL_INFO_PACKAGE), 2);
+    ExitOnFailure(hr, "Failed to allocate memory for related bundle package information.");
+    pPackage = pPackages->rgPackages + pPackages->cPackages;
+    ++pPackages->cPackages;
+    hr = StrAllocString(&pPackage->sczId, wzId, 0);
+    ExitOnFailure(hr, "Failed to copy related bundle package id.");
+    pPackage->type = type;
+    // TODO: try to look up the DisplayName and Description in Add/Remove Programs with the wzId.
+    if (ppPackage)
+    {
+        *ppPackage = pPackage;
+    }
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalInfoFindPackageById(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in LPCWSTR wzId,
+    __out BAL_INFO_PACKAGE** ppPackage
+    )
+{
+    *ppPackage = NULL;
+    for (DWORD i = 0; i < pPackages->cPackages; ++i)
+    {
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, wzId, -1, pPackages->rgPackages[i].sczId, -1))
+        {
+            *ppPackage = pPackages->rgPackages + i;
+            break;
+        }
+    }
+    return *ppPackage ? S_OK : E_NOTFOUND;
+}
+DAPI_(void) BalInfoUninitialize(
+    __in BAL_INFO_BUNDLE* pBundle
+    )
+{
+    for (DWORD i = 0; i < pBundle->packages.cPackages; ++i)
+    {
+        ReleaseStr(pBundle->packages.rgPackages[i].sczDisplayName);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczDescription);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczId);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczDisplayInternalUICondition);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczProductCode);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczUpgradeCode);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczVersion);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczInstallCondition);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczPrereqLicenseFile);
+        ReleaseStr(pBundle->packages.rgPackages[i].sczPrereqLicenseUrl);
+    }
+    ReleaseMem(pBundle->packages.rgPackages);
+    ReleaseStr(pBundle->sczName);
+    ReleaseStr(pBundle->sczLogVariable);
+    memset(pBundle, 0, sizeof(BAL_INFO_BUNDLE));
+}
+static HRESULT ParsePackagesFromXml(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in IXMLDOMDocument* pixdManifest
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNodeList* pNodeList = NULL;
+    IXMLDOMNode* pNode = NULL;
+    BAL_INFO_PACKAGE* prgPackages = NULL;
+    DWORD cPackages = 0;
+    LPWSTR scz = NULL;
+    hr = XmlSelectNodes(pixdManifest, L"/BootstrapperApplicationData/WixPackageProperties", &pNodeList);
+    ExitOnFailure(hr, "Failed to select all packages.");
+    hr = pNodeList->get_length(reinterpret_cast<long*>(&cPackages));
+    ExitOnFailure(hr, "Failed to get the package count.");
+    prgPackages = static_cast<BAL_INFO_PACKAGE*>(MemAlloc(sizeof(BAL_INFO_PACKAGE) * cPackages, TRUE));
+    ExitOnNull(prgPackages, hr, E_OUTOFMEMORY, "Failed to allocate memory for packages.");
+    DWORD iPackage = 0;
+    while (S_OK == (hr = XmlNextElement(pNodeList, &pNode, NULL)))
+    {
+        hr = XmlGetAttributeEx(pNode, L"Package", &prgPackages[iPackage].sczId);
+        ExitOnFailure(hr, "Failed to get package identifier for package.");
+        hr = XmlGetAttributeEx(pNode, L"DisplayName", &prgPackages[iPackage].sczDisplayName);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get display name for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"Description", &prgPackages[iPackage].sczDescription);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get description for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"PackageType", &scz);
+        ExitOnFailure(hr, "Failed to get package type for package.");
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Exe", -1, scz, -1))
+        {
+            prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_EXE;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Msi", -1, scz, -1))
+        {
+            prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_MSI;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Msp", -1, scz, -1))
+        {
+            prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_MSP;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, L"Msu", -1, scz, -1))
+        {
+            prgPackages[iPackage].type = BAL_INFO_PACKAGE_TYPE_MSU;
+        }
+        hr = XmlGetYesNoAttribute(pNode, L"Permanent", &prgPackages[iPackage].fPermanent);
+        ExitOnFailure(hr, "Failed to get permanent setting for package.");
+        hr = XmlGetYesNoAttribute(pNode, L"Vital", &prgPackages[iPackage].fVital);
+        ExitOnFailure(hr, "Failed to get vital setting for package.");
+        hr = XmlGetAttributeEx(pNode, L"ProductCode", &prgPackages[iPackage].sczProductCode);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get product code for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"UpgradeCode", &prgPackages[iPackage].sczUpgradeCode);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get upgrade code for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"Version", &prgPackages[iPackage].sczVersion);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get version for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"InstallCondition", &prgPackages[iPackage].sczInstallCondition);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get install condition for package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"Cache", &scz);
+        ExitOnFailure(hr, "Failed to get cache type for package.");
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, scz, -1, L"remove", -1))
+        {
+            prgPackages[iPackage].cacheType = BOOTSTRAPPER_CACHE_TYPE_REMOVE;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, scz, -1, L"keep", -1))
+        {
+            prgPackages[iPackage].cacheType = BOOTSTRAPPER_CACHE_TYPE_KEEP;
+        }
+        else if (CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, scz, -1, L"force", -1))
+        {
+            prgPackages[iPackage].cacheType = BOOTSTRAPPER_CACHE_TYPE_FORCE;
+        }
+        ++iPackage;
+        ReleaseNullObject(pNode);
+    }
+    ExitOnFailure(hr, "Failed to parse all package property elements.");
+    if (S_FALSE == hr)
+    {
+        hr = S_OK;
+    }
+    pPackages->cPackages = cPackages;
+    pPackages->rgPackages = prgPackages;
+    prgPackages = NULL;
+LExit:
+    ReleaseStr(scz);
+    ReleaseMem(prgPackages);
+    ReleaseObject(pNode);
+    ReleaseObject(pNodeList);
+    return hr;
+}
+static HRESULT ParseBalPackageInfoFromXml(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in IXMLDOMDocument* pixdManifest
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMNodeList* pNodeList = NULL;
+    IXMLDOMNode* pNode = NULL;
+    LPWSTR scz = NULL;
+    BAL_INFO_PACKAGE* pPackage = NULL;
+    hr = XmlSelectNodes(pixdManifest, L"/BootstrapperApplicationData/WixBalPackageInfo", &pNodeList);
+    ExitOnFailure(hr, "Failed to select all packages.");
+    while (S_OK == (hr = XmlNextElement(pNodeList, &pNode, NULL)))
+    {
+        hr = XmlGetAttributeEx(pNode, L"PackageId", &scz);
+        ExitOnFailure(hr, "Failed to get package identifier for WixBalPackageInfo.");
+        hr = BalInfoFindPackageById(pPackages, scz, &pPackage);
+        ExitOnFailure(hr, "Failed to find package specified in WixBalPackageInfo: %ls", scz);
+        hr = XmlGetAttributeEx(pNode, L"DisplayInternalUICondition", &pPackage->sczDisplayInternalUICondition);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get DisplayInternalUICondition setting for package.");
+        }
+        ReleaseNullObject(pNode);
+    }
+    ExitOnFailure(hr, "Failed to parse all WixBalPackageInfo elements.");
+    hr = XmlSelectNodes(pixdManifest, L"/BootstrapperApplicationData/WixMbaPrereqInformation", &pNodeList);
+    ExitOnFailure(hr, "Failed to select all packages.");
+    while (S_OK == (hr = XmlNextElement(pNodeList, &pNode, NULL)))
+    {
+        hr = XmlGetAttributeEx(pNode, L"PackageId", &scz);
+        ExitOnFailure(hr, "Failed to get package identifier for WixMbaPrereqInformation.");
+        hr = BalInfoFindPackageById(pPackages, scz, &pPackage);
+        ExitOnFailure(hr, "Failed to find package specified in WixMbaPrereqInformation: %ls", scz);
+        pPackage->fPrereqPackage = TRUE;
+        hr = XmlGetAttributeEx(pNode, L"LicenseFile", &pPackage->sczPrereqLicenseFile);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get LicenseFile setting for prereq package.");
+        }
+        hr = XmlGetAttributeEx(pNode, L"LicenseUrl", &pPackage->sczPrereqLicenseUrl);
+        if (E_NOTFOUND != hr)
+        {
+            ExitOnFailure(hr, "Failed to get LicenseUrl setting for prereq package.");
+        }
+        ReleaseNullObject(pNode);
+    }
+    ExitOnFailure(hr, "Failed to parse all WixMbaPrereqInformation elements.");
+    if (S_FALSE == hr)
+    {
+        hr = S_OK;
+    }
+LExit:
+    ReleaseStr(scz);
+    ReleaseObject(pNode);
+    ReleaseObject(pNodeList);
+    return hr;
+}
diff --git a/src/api/burn/balutil/balretry.cpp b/src/api/burn/balutil/balretry.cpp
new file mode 100644
index 00000000..9d8abd6d
--- /dev/null
+++ b/src/api/burn/balutil/balretry.cpp
@@ -0,0 +1,246 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+typedef enum BALRETRY_TYPE
+{
+    BALRETRY_TYPE_CACHE_CONTAINER,
+    BALRETRY_TYPE_CACHE_PAYLOAD,
+    BALRETRY_TYPE_EXECUTE,
+} BALRETRY_TYPE;
+struct BALRETRY_INFO
+{
+    LPWSTR sczId;
+    DWORD cRetries;
+    DWORD dwLastError;
+};
+static DWORD vdwMaxRetries = 0;
+static DWORD vdwTimeout = 0;
+static BALRETRY_INFO vrgRetryInfo[3];
+// prototypes
+static BOOL IsActiveRetryEntry(
+    __in BALRETRY_TYPE type,
+    __in_z LPCWSTR sczId
+    );
+static HRESULT StartActiveRetryEntry(
+    __in BALRETRY_TYPE type,
+    __in_z LPCWSTR sczId
+    );
+DAPI_(void) BalRetryInitialize(
+    __in DWORD dwMaxRetries,
+    __in DWORD dwTimeout
+    )
+{
+    BalRetryUninitialize(); // clean everything out.
+    vdwMaxRetries = dwMaxRetries;
+    vdwTimeout = dwTimeout;
+}
+DAPI_(void) BalRetryUninitialize()
+{
+    for (DWORD i = 0; i < countof(vrgRetryInfo); ++i)
+    {
+        ReleaseStr(vrgRetryInfo[i].sczId);
+        memset(vrgRetryInfo + i, 0, sizeof(BALRETRY_INFO));
+    }
+    vdwMaxRetries = 0;
+    vdwTimeout = 0;
+}
+DAPI_(void) BalRetryStartContainerOrPayload(
+    __in_z_opt LPCWSTR wzContainerOrPackageId,
+    __in_z_opt LPCWSTR wzPayloadId
+    )
+{
+    if (!wzContainerOrPackageId && !wzPayloadId)
+    {
+        ReleaseNullStr(vrgRetryInfo[BALRETRY_TYPE_CACHE_CONTAINER].sczId);
+        ReleaseNullStr(vrgRetryInfo[BALRETRY_TYPE_CACHE_PAYLOAD].sczId);
+    }
+    else if (wzPayloadId)
+    {
+        StartActiveRetryEntry(BALRETRY_TYPE_CACHE_PAYLOAD, wzPayloadId);
+    }
+    else
+    {
+        StartActiveRetryEntry(BALRETRY_TYPE_CACHE_CONTAINER, wzContainerOrPackageId);
+    }
+}
+DAPI_(void) BalRetryStartPackage(
+    __in_z LPCWSTR wzPackageId
+    )
+{
+    StartActiveRetryEntry(BALRETRY_TYPE_EXECUTE, wzPackageId);
+}
+DAPI_(void) BalRetryErrorOccurred(
+    __in_z LPCWSTR wzPackageId,
+    __in DWORD dwError
+    )
+{
+    if (IsActiveRetryEntry(BALRETRY_TYPE_EXECUTE, wzPackageId))
+    {
+        vrgRetryInfo[BALRETRY_TYPE_EXECUTE].dwLastError = dwError;
+    }
+}
+DAPI_(HRESULT) BalRetryEndContainerOrPayload(
+    __in_z_opt LPCWSTR wzContainerOrPackageId,
+    __in_z_opt LPCWSTR wzPayloadId,
+    __in HRESULT hrError,
+    __inout BOOL* pfRetry
+    )
+{
+    HRESULT hr = S_OK;
+    BALRETRY_TYPE type = BALRETRY_TYPE_CACHE_PAYLOAD;
+    LPCWSTR wzId = NULL;
+    if (!wzContainerOrPackageId && !wzPayloadId)
+    {
+        ReleaseNullStr(vrgRetryInfo[BALRETRY_TYPE_CACHE_CONTAINER].sczId);
+        ReleaseNullStr(vrgRetryInfo[BALRETRY_TYPE_CACHE_PAYLOAD].sczId);
+        ExitFunction();
+    }
+    else if (wzPayloadId)
+    {
+        type = BALRETRY_TYPE_CACHE_PAYLOAD;
+        wzId = wzPayloadId;
+    }
+    else
+    {
+        type = BALRETRY_TYPE_CACHE_CONTAINER;
+        wzId = wzContainerOrPackageId;
+    }
+    if (FAILED(hrError) && vrgRetryInfo[type].cRetries < vdwMaxRetries && IsActiveRetryEntry(type, wzId))
+    {
+        // Retry on all errors except the following.
+        if (HRESULT_FROM_WIN32(ERROR_INSTALL_USEREXIT) != hrError &&
+            BG_E_NETWORK_DISCONNECTED != hrError &&
+            HRESULT_FROM_WIN32(ERROR_FILE_NOT_FOUND) != hrError &&
+            HRESULT_FROM_WIN32(ERROR_INTERNET_NAME_NOT_RESOLVED) != hrError)
+        {
+            *pfRetry = TRUE;
+        }
+    }
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalRetryEndPackage(
+    __in_z LPCWSTR wzPackageId,
+    __in HRESULT hrError,
+    __inout BOOL* pfRetry
+    )
+{
+    HRESULT hr = S_OK;
+    BALRETRY_TYPE type = BALRETRY_TYPE_EXECUTE;
+    if (!wzPackageId || !*wzPackageId)
+    {
+        ReleaseNullStr(vrgRetryInfo[type].sczId);
+    }
+    else if (FAILED(hrError) && vrgRetryInfo[type].cRetries < vdwMaxRetries && IsActiveRetryEntry(type, wzPackageId))
+    {
+        // If the service is out of whack, just try again.
+        if (HRESULT_FROM_WIN32(ERROR_INSTALL_SERVICE_FAILURE) == hrError)
+        {
+            *pfRetry = TRUE;
+        }
+        else if (HRESULT_FROM_WIN32(ERROR_INSTALL_FAILURE) == hrError)
+        {
+            DWORD dwError = vrgRetryInfo[type].dwLastError;
+            // If we failed with one of these specific error codes, then retry since
+            // we've seen these have a high success of succeeding on retry.
+            if (1303 == dwError ||
+                1304 == dwError ||
+                1306 == dwError ||
+                1307 == dwError ||
+                1309 == dwError ||
+                1310 == dwError ||
+                1311 == dwError ||
+                1312 == dwError ||
+                1316 == dwError ||
+                1317 == dwError ||
+                1321 == dwError ||
+                1335 == dwError ||
+                1402 == dwError ||
+                1406 == dwError ||
+                1606 == dwError ||
+                1706 == dwError ||
+                1719 == dwError ||
+                1723 == dwError ||
+                1923 == dwError ||
+                1931 == dwError)
+            {
+                *pfRetry = TRUE;
+            }
+        }
+        else if (HRESULT_FROM_WIN32(ERROR_INSTALL_ALREADY_RUNNING) == hrError)
+        {
+            *pfRetry = TRUE;
+        }
+    }
+    return hr;
+}
+// Internal functions.
+static BOOL IsActiveRetryEntry(
+    __in BALRETRY_TYPE type,
+    __in_z LPCWSTR sczId
+    )
+{
+    BOOL fActive = FALSE;
+    fActive = vrgRetryInfo[type].sczId && CSTR_EQUAL == ::CompareStringW(LOCALE_NEUTRAL, 0, sczId, -1, vrgRetryInfo[type].sczId, -1);
+    return fActive;
+}
+static HRESULT StartActiveRetryEntry(
+    __in BALRETRY_TYPE type,
+    __in_z LPCWSTR sczId
+    )
+{
+    HRESULT hr = S_OK;
+    if (!sczId || !*sczId)
+    {
+        ReleaseNullStr(vrgRetryInfo[type].sczId);
+    }
+    else if (IsActiveRetryEntry(type, sczId))
+    {
+        ++vrgRetryInfo[type].cRetries;
+        ::Sleep(vdwTimeout);
+    }
+    else
+    {
+        hr = StrAllocString(&vrgRetryInfo[type].sczId, sczId, 0);
+        vrgRetryInfo[type].cRetries = 0;
+    }
+    vrgRetryInfo[type].dwLastError = ERROR_SUCCESS;
+    return hr;
+}
diff --git a/src/api/burn/balutil/balutil.cpp b/src/api/burn/balutil/balutil.cpp
new file mode 100644
index 00000000..7a638219
--- /dev/null
+++ b/src/api/burn/balutil/balutil.cpp
@@ -0,0 +1,425 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+const DWORD VARIABLE_GROW_FACTOR = 80;
+static IBootstrapperEngine* vpEngine = NULL;
+// prototypes
+DAPI_(void) BalInitialize(
+    __in IBootstrapperEngine* pEngine
+    )
+{
+    pEngine->AddRef();
+    ReleaseObject(vpEngine);
+    vpEngine = pEngine;
+}
+DAPI_(HRESULT) BalInitializeFromCreateArgs(
+    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+    __out_opt IBootstrapperEngine** ppEngine
+    )
+{
+    HRESULT hr = S_OK;
+    IBootstrapperEngine* pEngine = NULL;
+    hr = BalBootstrapperEngineCreate(pArgs->pfnBootstrapperEngineProc, pArgs->pvBootstrapperEngineProcContext, &pEngine);
+    ExitOnFailure(hr, "Failed to create BalBootstrapperEngine.");
+    BalInitialize(pEngine);
+    if (ppEngine)
+    {
+        *ppEngine = pEngine;
+    }
+    pEngine = NULL;
+LExit:
+    ReleaseObject(pEngine);
+    return hr;
+}
+DAPI_(void) BalUninitialize()
+{
+    ReleaseNullObject(vpEngine);
+}
+DAPI_(HRESULT) BalManifestLoad(
+    __in HMODULE hBootstrapperApplicationModule,
+    __out IXMLDOMDocument** ppixdManifest
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR sczPath = NULL;
+    hr = PathRelativeToModule(&sczPath, BAL_MANIFEST_FILENAME, hBootstrapperApplicationModule);
+    ExitOnFailure(hr, "Failed to get path to bootstrapper application manifest: %ls", BAL_MANIFEST_FILENAME);
+    hr = XmlLoadDocumentFromFile(sczPath, ppixdManifest);
+    ExitOnFailure(hr, "Failed to load bootstrapper application manifest '%ls' from path: %ls", BAL_MANIFEST_FILENAME, sczPath);
+LExit:
+    ReleaseStr(sczPath);
+    return hr;
+}
+DAPI_(HRESULT) BalEvaluateCondition(
+    __in_z LPCWSTR wzCondition,
+    __out BOOL* pf
+    )
+{
+    HRESULT hr = S_OK;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = vpEngine->EvaluateCondition(wzCondition, pf);
+LExit:
+    return hr;
+}
+// The contents of psczOut may be sensitive, should keep encrypted and SecureZeroFree.
+DAPI_(HRESULT) BalFormatString(
+    __in_z LPCWSTR wzFormat,
+    __inout LPWSTR* psczOut
+    )
+{
+    HRESULT hr = S_OK;
+    SIZE_T cch = 0;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    if (*psczOut)
+    {
+        hr = StrMaxLength(*psczOut, &cch);
+        ExitOnFailure(hr, "Failed to determine length of value.");
+    }
+    hr = vpEngine->FormatString(wzFormat, *psczOut, &cch);
+    if (E_MOREDATA == hr)
+    {
+        ++cch;
+        hr = StrAllocSecure(psczOut, cch);
+        ExitOnFailure(hr, "Failed to allocate value.");
+        hr = vpEngine->FormatString(wzFormat, *psczOut, &cch);
+    }
+LExit:
+    return hr;
+}
+// The contents of pllValue may be sensitive, if variable is hidden should keep value encrypted and SecureZeroMemory.
+DAPI_(HRESULT) BalGetNumericVariable(
+    __in_z LPCWSTR wzVariable,
+    __out LONGLONG* pllValue
+    )
+{
+    HRESULT hr = S_OK;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = vpEngine->GetVariableNumeric(wzVariable, pllValue);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalSetNumericVariable(
+    __in_z LPCWSTR wzVariable,
+    __in LONGLONG llValue
+    )
+{
+    HRESULT hr = S_OK;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = vpEngine->SetVariableNumeric(wzVariable, llValue);
+LExit:
+    return hr;
+}
+DAPI_(BOOL) BalVariableExists(
+    __in_z LPCWSTR wzVariable
+    )
+{
+    HRESULT hr = S_OK;
+    SIZE_T cch = 0;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = vpEngine->GetVariableString(wzVariable, NULL, &cch);
+LExit:
+    return E_NOTFOUND != hr;
+}
+// The contents of psczValue may be sensitive, if variable is hidden should keep value encrypted and SecureZeroFree.
+DAPI_(HRESULT) BalGetStringVariable(
+    __in_z LPCWSTR wzVariable,
+    __inout LPWSTR* psczValue
+    )
+{
+    HRESULT hr = S_OK;
+    SIZE_T cch = 0;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    if (*psczValue)
+    {
+        hr = StrMaxLength(*psczValue, &cch);
+        ExitOnFailure(hr, "Failed to determine length of value.");
+    }
+    hr = vpEngine->GetVariableString(wzVariable, *psczValue, &cch);
+    if (E_MOREDATA == hr)
+    {
+        ++cch;
+        hr = StrAllocSecure(psczValue, cch);
+        ExitOnFailure(hr, "Failed to allocate value.");
+        hr = vpEngine->GetVariableString(wzVariable, *psczValue, &cch);
+    }
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalSetStringVariable(
+    __in_z LPCWSTR wzVariable,
+    __in_z_opt LPCWSTR wzValue,
+    __in BOOL fFormatted
+    )
+{
+    HRESULT hr = S_OK;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = vpEngine->SetVariableString(wzVariable, wzValue, fFormatted);
+LExit:
+    return hr;
+}
+DAPIV_(HRESULT) BalLog(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    )
+{
+    HRESULT hr = S_OK;
+    va_list args;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    va_start(args, szFormat);
+    hr = BalLogArgs(level, szFormat, args);
+    va_end(args);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalLogArgs(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    )
+{
+    HRESULT hr = S_OK;
+    LPSTR sczFormattedAnsi = NULL;
+    LPWSTR sczMessage = NULL;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
+    ExitOnFailure(hr, "Failed to format log string.");
+    hr = StrAllocStringAnsi(&sczMessage, sczFormattedAnsi, 0, CP_UTF8);
+    ExitOnFailure(hr, "Failed to convert log string to Unicode.");
+    hr = vpEngine->Log(level, sczMessage);
+LExit:
+    ReleaseStr(sczMessage);
+    ReleaseStr(sczFormattedAnsi);
+    return hr;
+}
+DAPIV_(HRESULT) BalLogError(
+    __in HRESULT hrError,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    )
+{
+    HRESULT hr = S_OK;
+    va_list args;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    va_start(args, szFormat);
+    hr = BalLogErrorArgs(hrError, szFormat, args);
+    va_end(args);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalLogErrorArgs(
+    __in HRESULT hrError,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    )
+{
+    HRESULT hr = S_OK;
+    LPSTR sczFormattedAnsi = NULL;
+    LPWSTR sczMessage = NULL;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
+    ExitOnFailure(hr, "Failed to format error log string.");
+    hr = StrAllocFormatted(&sczMessage, L"Error 0x%08x: %S", hrError, sczFormattedAnsi);
+    ExitOnFailure(hr, "Failed to prepend error number to error log string.");
+    hr = vpEngine->Log(BOOTSTRAPPER_LOG_LEVEL_ERROR, sczMessage);
+LExit:
+    ReleaseStr(sczMessage);
+    ReleaseStr(sczFormattedAnsi);
+    return hr;
+}
+DAPIV_(HRESULT) BalLogId(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in DWORD dwLogId,
+    __in HMODULE hModule,
+    ...
+    )
+{
+    HRESULT hr = S_OK;
+    va_list args;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    va_start(args, hModule);
+    hr = BalLogIdArgs(level, dwLogId, hModule, args);
+    va_end(args);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BalLogIdArgs(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in DWORD dwLogId,
+    __in HMODULE hModule,
+    __in va_list args
+    )
+{
+    HRESULT hr = S_OK;
+    LPWSTR pwz = NULL;
+    DWORD cch = 0;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BalInitialize() must be called first.");
+    }
+    // Get the string for the id.
+#pragma prefast(push)
+#pragma prefast(disable:25028)
+#pragma prefast(disable:25068)
+    cch = ::FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_HMODULE,
+        static_cast<LPCVOID>(hModule), dwLogId, 0, reinterpret_cast<LPWSTR>(&pwz), 0, &args);
+#pragma prefast(pop)
+    if (0 == cch)
+    {
+        ExitOnLastError(hr, "Failed to log id: %d", dwLogId);
+    }
+    if (2 <= cch && L'\r' == pwz[cch - 2] && L'\n' == pwz[cch - 1])
+    {
+        pwz[cch - 2] = L'\0'; // remove newline from message table.
+    }
+    hr = vpEngine->Log(level, pwz);
+LExit:
+    if (pwz)
+    {
+        ::LocalFree(pwz);
+    }
+    return hr;
+}
diff --git a/src/api/burn/balutil/balutil.nuspec b/src/api/burn/balutil/balutil.nuspec
new file mode 100644
index 00000000..e38362ec
--- /dev/null
+++ b/src/api/burn/balutil/balutil.nuspec
@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+<package >
+  <metadata>
+    <id>$id$</id>
+    <version>$version$</version>
+    <authors>$authors$</authors>
+    <owners>$authors$</owners>
+    <license type="expression">MS-RL</license>
+    <projectUrl>https://github.com/wixtoolset/balutil</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>$description$</description>
+    <copyright>$copyright$</copyright>
+    <dependencies>
+        <dependency id="WixToolset.BootstrapperCore.Native" version="[4,5)" />
+        <dependency id="WixToolset.DUtil" version="[4,5)" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="build\$id$.props" target="build\" />
+    <file src="inc\*" target="build\native\include" />
+    <file src="..\..\build\$configuration$\v140\x86\balutil.lib" target="build\native\v140\x86" />
+    <file src="..\..\build\$configuration$\v140\x64\balutil.lib" target="build\native\v140\x64" />
+    <file src="..\..\build\$configuration$\v141\x86\balutil.lib" target="build\native\v141\x86" />
+    <file src="..\..\build\$configuration$\v141\x64\balutil.lib" target="build\native\v141\x64" />
+    <file src="..\..\build\$configuration$\v141\ARM64\balutil.lib" target="build\native\v141\ARM64" />
+    <file src="..\..\build\$configuration$\v142\x86\balutil.lib" target="build\native\v142\x86" />
+    <file src="..\..\build\$configuration$\v142\x64\balutil.lib" target="build\native\v142\x64" />
+    <file src="..\..\build\$configuration$\v142\ARM64\balutil.lib" target="build\native\v142\ARM64" />
+  </files>
+</package>
diff --git a/src/api/burn/balutil/balutil.vcxproj b/src/api/burn/balutil/balutil.vcxproj
new file mode 100644
index 00000000..ab33f159
--- /dev/null
+++ b/src/api/burn/balutil/balutil.vcxproj
@@ -0,0 +1,101 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}</ProjectGuid>
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <TargetName>balutil</TargetName>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+    <Description>WiX Toolset Bootstrapper Application Layer native utility library</Description>
+    <PackageId>WixToolset.BalUtil</PackageId>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <Import Project="..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" />
+  <Import Project="..\NativeMultiTargeting.Build.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <PropertyGroup>
+    <ProjectAdditionalIncludeDirectories>$(ProjectDir)..\inc</ProjectAdditionalIncludeDirectories>
+  </PropertyGroup>
+  <ItemGroup>
+    <ClCompile Include="BalBootstrapperEngine.cpp" />
+    <ClCompile Include="balcondition.cpp" />
+    <ClCompile Include="balinfo.cpp" />
+    <ClCompile Include="balretry.cpp" />
+    <ClCompile Include="balutil.cpp" />
+    <ClCompile Include="precomp.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="inc\BAFunctions.h" />
+    <ClInclude Include="inc\BalBaseBAFunctions.h" />
+    <ClInclude Include="inc\BalBaseBAFunctionsProc.h" />
+    <ClInclude Include="inc\BalBaseBootstrapperApplication.h" />
+    <ClInclude Include="inc\BalBaseBootstrapperApplicationProc.h" />
+    <ClInclude Include="inc\BalBootstrapperEngine.h" />
+    <ClInclude Include="inc\balcondition.h" />
+    <ClInclude Include="inc\balinfo.h" />
+    <ClInclude Include="inc\balretry.h" />
+    <ClInclude Include="inc\balutil.h" />
+    <ClInclude Include="inc\IBAFunctions.h" />
+    <ClInclude Include="inc\IBootstrapperApplication.h" />
+    <ClInclude Include="inc\IBootstrapperApplicationFactory.h" />
+    <ClInclude Include="inc\IBootstrapperEngine.h" />
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props'))" />
+  </Target>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/balutil/build/WixToolset.BalUtil.props b/src/api/burn/balutil/build/WixToolset.BalUtil.props
new file mode 100644
index 00000000..45b97f6a
--- /dev/null
+++ b/src/api/burn/balutil/build/WixToolset.BalUtil.props
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <ResourceCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v140')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v140\$(PlatformTarget)\balutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v141')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v141\$(PlatformTarget)\balutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v142')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v142\$(PlatformTarget)\balutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+</Project>
diff --git a/src/api/burn/balutil/inc/BAFunctions.h b/src/api/burn/balutil/inc/BAFunctions.h
new file mode 100644
index 00000000..2970478f
--- /dev/null
+++ b/src/api/burn/balutil/inc/BAFunctions.h
@@ -0,0 +1,147 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+// The first 1024 messages are reserved so that the BA messages have the same value here.
+enum BA_FUNCTIONS_MESSAGE
+{
+    BA_FUNCTIONS_MESSAGE_ONDETECTBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONDETECTCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPLANBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONPLANCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONSTARTUP = BOOTSTRAPPER_APPLICATION_MESSAGE_ONSTARTUP,
+    BA_FUNCTIONS_MESSAGE_ONSHUTDOWN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONSHUTDOWN,
+    BA_FUNCTIONS_MESSAGE_ONSYSTEMSHUTDOWN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMSHUTDOWN,
+    BA_FUNCTIONS_MESSAGE_ONDETECTFORWARDCOMPATIBLEBUNDLE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTFORWARDCOMPATIBLEBUNDLE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTUPDATEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONDETECTUPDATE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTUPDATECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDBUNDLE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTPACKAGEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDMSIPACKAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDMSIPACKAGE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTPATCHTARGET = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPATCHTARGET,
+    BA_FUNCTIONS_MESSAGE_ONDETECTMSIFEATURE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTMSIFEATURE,
+    BA_FUNCTIONS_MESSAGE_ONDETECTPACKAGECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLE,
+    BA_FUNCTIONS_MESSAGE_ONPLANPACKAGEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONPLANPATCHTARGET = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPATCHTARGET,
+    BA_FUNCTIONS_MESSAGE_ONPLANMSIFEATURE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIFEATURE,
+    BA_FUNCTIONS_MESSAGE_ONPLANPACKAGECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONAPPLYBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONELEVATEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONELEVATECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONERROR = BOOTSTRAPPER_APPLICATION_MESSAGE_ONERROR,
+    BA_FUNCTIONS_MESSAGE_ONREGISTERBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONREGISTERCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHEPACKAGEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHEACQUIREBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHEACQUIREPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONCACHEACQUIRERESOLVING = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRERESOLVING,
+    BA_FUNCTIONS_MESSAGE_ONCACHEACQUIRECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHEVERIFYBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHEVERIFYCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHEPACKAGECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEPACKAGEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEPATCHTARGET = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPATCHTARGET,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEMSIMESSAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEMSIMESSAGE,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEFILESINUSE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEFILESINUSE,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTEPACKAGECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONEXECUTECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONUNREGISTERBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONUNREGISTERCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONAPPLYCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONLAUNCHAPPROVEDEXEBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXEBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONLAUNCHAPPROVEDEXECOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXECOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPLANMSIPACKAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIPACKAGE,
+    BA_FUNCTIONS_MESSAGE_ONBEGINMSITRANSACTIONBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONBEGINMSITRANSACTIONCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCOMMITMSITRANSACTIONBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCOMMITMSITRANSACTIONCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONROLLBACKMSITRANSACTIONBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONROLLBACKMSITRANSACTIONCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPAUSEAUTOMATICUPDATESBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONPAUSEAUTOMATICUPDATESCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONSYSTEMRESTOREPOINTBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONSYSTEMRESTOREPOINTCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONPLANNEDPACKAGE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANNEDPACKAGE,
+    BA_FUNCTIONS_MESSAGE_ONPLANFORWARDCOMPATIBLEBUNDLE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANFORWARDCOMPATIBLEBUNDLE,
+    BA_FUNCTIONS_MESSAGE_ONCACHEVERIFYPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONCACHEPAYLOADEXTRACTBEGIN = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTBEGIN,
+    BA_FUNCTIONS_MESSAGE_ONCACHEPAYLOADEXTRACTCOMPLETE = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTCOMPLETE,
+    BA_FUNCTIONS_MESSAGE_ONCACHEPAYLOADEXTRACTPROGRESS = BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTPROGRESS,
+    BA_FUNCTIONS_MESSAGE_ONTHEMELOADED = 1024,
+    BA_FUNCTIONS_MESSAGE_WNDPROC,
+};
+typedef HRESULT(WINAPI *PFN_BA_FUNCTIONS_PROC)(
+    __in BA_FUNCTIONS_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    );
+struct BA_FUNCTIONS_CREATE_ARGS
+{
+    DWORD cbSize;
+    DWORD64 qwBAFunctionsAPIVersion;
+    BOOTSTRAPPER_CREATE_ARGS* pBootstrapperCreateArgs;
+};
+struct BA_FUNCTIONS_CREATE_RESULTS
+{
+    DWORD cbSize;
+    PFN_BA_FUNCTIONS_PROC pfnBAFunctionsProc;
+    LPVOID pvBAFunctionsProcContext;
+};
+struct BA_FUNCTIONS_ONTHEMELOADED_ARGS
+{
+    DWORD cbSize;
+    THEME* pTheme;
+    WIX_LOCALIZATION* pWixLoc;
+};
+struct BA_FUNCTIONS_ONTHEMELOADED_RESULTS
+{
+    DWORD cbSize;
+};
+struct BA_FUNCTIONS_WNDPROC_ARGS
+{
+    DWORD cbSize;
+    THEME* pTheme;
+    HWND hWnd;
+    UINT uMsg;
+    WPARAM wParam;
+    LPARAM lParam;
+};
+struct BA_FUNCTIONS_WNDPROC_RESULTS
+{
+    DWORD cbSize;
+    LRESULT lres;
+};
+typedef HRESULT(WINAPI *PFN_BA_FUNCTIONS_CREATE)(
+    __in const BA_FUNCTIONS_CREATE_ARGS* pArgs,
+    __inout BA_FUNCTIONS_CREATE_RESULTS* pResults
+    );
+typedef void (WINAPI *PFN_BA_FUNCTIONS_DESTROY)();
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctions.h b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
new file mode 100644
index 00000000..ee2e452f
--- /dev/null
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctions.h
@@ -0,0 +1,867 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <msiquery.h>
+#include "dutil.h"
+#include "locutil.h"
+#include "thmutil.h"
+#include "BAFunctions.h"
+#include "IBAFunctions.h"
+#include "BootstrapperEngine.h"
+#include "BootstrapperApplication.h"
+#include "IBootstrapperEngine.h"
+#include "IBootstrapperApplication.h"
+class CBalBaseBAFunctions : public IBAFunctions
+{
+public: // IUnknown
+    virtual STDMETHODIMP QueryInterface(
+        __in REFIID riid,
+        __out LPVOID *ppvObject
+        )
+    {
+        if (!ppvObject)
+        {
+            return E_INVALIDARG;
+        }
+        *ppvObject = NULL;
+        if (::IsEqualIID(__uuidof(IBAFunctions), riid))
+        {
+            *ppvObject = static_cast<IBAFunctions*>(this);
+        }
+        else if (::IsEqualIID(__uuidof(IBootstrapperApplication), riid))
+        {
+            *ppvObject = static_cast<IBootstrapperApplication*>(this);
+        }
+        else if (::IsEqualIID(IID_IUnknown, riid))
+        {
+            *ppvObject = static_cast<IUnknown*>(this);
+        }
+        else // no interface for requested iid
+        {
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+    virtual STDMETHODIMP_(ULONG) AddRef()
+    {
+        return ::InterlockedIncrement(&this->m_cReferences);
+    }
+    virtual STDMETHODIMP_(ULONG) Release()
+    {
+        long l = ::InterlockedDecrement(&this->m_cReferences);
+        if (0 < l)
+        {
+            return l;
+        }
+        delete this;
+        return 0;
+    }
+public: // IBootstrapperApplication
+    virtual STDMETHODIMP_(HRESULT) BAProc(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+        return E_NOTIMPL;
+    }
+    virtual STDMETHODIMP_(void) BAProcFallback(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __inout HRESULT* /*phr*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+    }
+    virtual STDMETHODIMP OnStartup()
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnShutdown(
+        __inout BOOTSTRAPPER_SHUTDOWN_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemShutdown(
+        __in DWORD /*dwEndSession*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectBegin(
+        __in BOOL /*fCached*/,
+        __in BOOL /*fInstalled*/,
+        __in DWORD /*cPackages*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectForwardCompatibleBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOL /*fMissingFromCache*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdateBegin(
+        __in_z LPCWSTR /*wzUpdateLocation*/,
+        __inout BOOL* /*pfCancel*/,
+        __inout BOOL* /*pfSkip*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdate(
+        __in_z LPCWSTR /*wzUpdateLocation*/,
+        __in DWORD64 /*dw64Size*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in_z LPCWSTR /*wzTitle*/,
+        __in_z LPCWSTR /*wzSummary*/,
+        __in_z LPCWSTR /*wzContentType*/,
+        __in_z LPCWSTR /*wzContent*/,
+        __inout BOOL* /*pfCancel*/,
+        __inout BOOL* /*pfStopProcessingUpdates*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdateComplete(
+        __in HRESULT /*hrStatus*/,
+        __inout BOOL* /*pfIgnoreError*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectRelatedBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
+        __in BOOL /*fMissingFromCache*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectRelatedMsiPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzUpgradeCode*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*patchState*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectMsiFeature(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzFeatureId*/,
+        __in BOOTSTRAPPER_FEATURE_STATE /*state*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*state*/,
+        __in BOOL /*fCached*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectComplete(
+        __in HRESULT /*hrStatus*/,
+        __in BOOL /*fEligibleForCleanup*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanBegin(
+        __in DWORD /*cPackages*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanRelatedBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*state*/,
+        __in BOOL /*fCached*/,
+        __in BOOTSTRAPPER_PACKAGE_CONDITION_RESULT /*installCondition*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __in BOOTSTRAPPER_CACHE_TYPE /*recommendedCacheType*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestState*/,
+        __inout BOOTSTRAPPER_CACHE_TYPE* /*pRequestedCacheType*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanMsiFeature(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzFeatureId*/,
+        __in BOOTSTRAPPER_FEATURE_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_FEATURE_STATE* /*pRequestedState*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanMsiPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOL /*fExecute*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*action*/,
+        __inout BOOL* /*pfCancel*/,
+        __inout BURN_MSI_PROPERTY* /*pActionMsiProperty*/,
+        __inout INSTALLUILEVEL* /*pUiLevel*/,
+        __inout BOOL* /*pfDisableExternalUiHandler*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*requested*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlannedPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*execute*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*rollback*/,
+        __in BOOL /*fPlannedCache*/,
+        __in BOOL /*fPlannedUncache*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnApplyBegin(
+        __in DWORD /*dwPhaseCount*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnElevateBegin(
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnElevateComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnProgress(
+        __in DWORD /*dwProgressPercentage*/,
+        __in DWORD /*dwOverallProgressPercentage*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return IDNOACTION;
+    }
+    virtual STDMETHODIMP OnError(
+        __in BOOTSTRAPPER_ERROR_TYPE /*errorType*/,
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*dwCode*/,
+        __in_z LPCWSTR /*wzError*/,
+        __in DWORD /*dwUIHint*/,
+        __in DWORD /*cData*/,
+        __in_ecount_z_opt(cData) LPCWSTR* /*rgwzData*/,
+        __in int /*nRecommendation*/,
+        __inout int* /*pResult*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRegisterBegin(
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRegisterComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheBegin(
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*cCachePayloads*/,
+        __in DWORD64 /*dw64PackageCacheSize*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireBegin(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in_z LPCWSTR /*wzSource*/,
+        __in_z_opt LPCWSTR /*wzDownloadUrl*/,
+        __in_z_opt LPCWSTR /*wzPayloadContainerId*/,
+        __in BOOTSTRAPPER_CACHE_OPERATION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHE_OPERATION* /*pAction*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireProgress(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireResolving(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in_z LPCWSTR* /*rgSearchPaths*/,
+        __in DWORD /*cSearchPaths*/,
+        __in BOOL /*fFoundLocal*/,
+        __in DWORD /*dwRecommendedSearchPath*/,
+        __in_z_opt LPCWSTR /*wzDownloadUrl*/,
+        __in_z_opt LPCWSTR /*wzPayloadContainerId*/,
+        __in BOOTSTRAPPER_CACHE_RESOLVE_OPERATION /*recommendation*/,
+        __inout DWORD* /*pdwChosenSearchPath*/,
+        __inout BOOTSTRAPPER_CACHE_RESOLVE_OPERATION* /*pAction*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireComplete(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheVerifyBegin(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheVerifyProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __in BOOTSTRAPPER_CACHE_VERIFY_STEP /*verifyStep*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheVerifyComplete(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteBegin(
+        __in DWORD /*cExecutingPackages*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOL /*fExecute*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*action*/,
+        __in INSTALLUILEVEL /*uiLevel*/,
+        __in BOOL /*fDisableExternalUiHandler*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzTargetProductCode*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteProgress(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*dwProgressPercentage*/,
+        __in DWORD /*dwOverallProgressPercentage*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteMsiMessage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in INSTALLMESSAGE /*messageType*/,
+        __in DWORD /*dwUIHint*/,
+        __in_z LPCWSTR /*wzMessage*/,
+        __in DWORD /*cData*/,
+        __in_ecount_z_opt(cData) LPCWSTR* /*rgwzData*/,
+        __in int /*nRecommendation*/,
+        __inout int* /*pResult*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteFilesInUse(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*cFiles*/,
+        __in_ecount_z(cFiles) LPCWSTR* /*rgwzFiles*/,
+        __in int /*nRecommendation*/,
+        __inout int* /*pResult*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_APPLY_RESTART /*restart*/,
+        __in BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnUnregisterBegin(
+        __in BOOL /*fKeepRegistration*/,
+        __inout BOOL* /*pfForceKeepRegistration*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnUnregisterComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnApplyComplete(
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_APPLY_RESTART /*restart*/,
+        __in BOOTSTRAPPER_APPLYCOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_APPLYCOMPLETE_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnLaunchApprovedExeBegin(
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnLaunchApprovedExeComplete(
+        __in HRESULT /*hrStatus*/,
+        __in DWORD /*dwProcessId*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnBeginMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnBeginMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCommitMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCommitMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRollbackMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRollbackMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPauseAutomaticUpdatesBegin(
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPauseAutomaticUpdatesComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemRestorePointBegin(
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemRestorePointComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanForwardCompatibleBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOL /*fRecommendedIgnoreBundle*/,
+        __inout BOOL* /*pfCancel*/,
+        __inout BOOL* /*pfIgnoreBundle*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyBegin(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyComplete(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractBegin(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* /*pfCancel*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractComplete(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+public: // IBAFunctions
+    virtual STDMETHODIMP OnPlan(
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnThemeLoaded(
+        THEME* pTheme,
+        WIX_LOCALIZATION* pWixLoc
+        )
+    {
+        HRESULT hr = S_OK;
+        m_pTheme = pTheme;
+        m_pWixLoc = pWixLoc;
+        return hr;
+    }
+    virtual STDMETHODIMP WndProc(
+        __in THEME* pTheme,
+        __in HWND hWnd,
+        __in UINT uMsg,
+        __in WPARAM wParam,
+        __in LPARAM lParam,
+        __inout LRESULT* plRes
+        )
+    {
+        HRESULT hr = S_OK;
+        *plRes = ThemeDefWindowProc(pTheme, hWnd, uMsg, wParam, lParam);
+        return hr;
+    }
+    virtual STDMETHODIMP BAFunctionsProc(
+        __in BA_FUNCTIONS_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+        return E_NOTIMPL;
+    }
+protected:
+    CBalBaseBAFunctions(
+        __in HMODULE hModule,
+        __in IBootstrapperEngine* pEngine,
+        __in const BA_FUNCTIONS_CREATE_ARGS* pArgs
+        )
+    {
+        m_cReferences = 1;
+        m_hModule = hModule;
+        pEngine->AddRef();
+        m_pEngine = pEngine;
+        memcpy_s(&m_command, sizeof(m_command), pArgs->pBootstrapperCreateArgs->pCommand, sizeof(BOOTSTRAPPER_COMMAND));
+        memcpy_s(&m_baCreateArgs, sizeof(m_baCreateArgs), pArgs->pBootstrapperCreateArgs, sizeof(BOOTSTRAPPER_CREATE_ARGS));
+        memcpy_s(&m_bafCreateArgs, sizeof(m_bafCreateArgs), pArgs, sizeof(BA_FUNCTIONS_CREATE_ARGS));
+        m_baCreateArgs.pCommand = &m_command;
+        m_bafCreateArgs.pBootstrapperCreateArgs = &m_baCreateArgs;
+    }
+    virtual ~CBalBaseBAFunctions()
+    {
+        ReleaseNullObject(m_pEngine);
+    }
+private:
+    long m_cReferences;
+protected:
+    IBootstrapperEngine* m_pEngine;
+    HMODULE m_hModule;
+    BA_FUNCTIONS_CREATE_ARGS m_bafCreateArgs;
+    BOOTSTRAPPER_CREATE_ARGS m_baCreateArgs;
+    BOOTSTRAPPER_COMMAND m_command;
+    THEME* m_pTheme;
+    WIX_LOCALIZATION* m_pWixLoc;
+};
diff --git a/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
new file mode 100644
index 00000000..7e89fe83
--- /dev/null
+++ b/src/api/burn/balutil/inc/BalBaseBAFunctionsProc.h
@@ -0,0 +1,124 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "BalBaseBootstrapperApplicationProc.h"
+#include "BAFunctions.h"
+#include "IBAFunctions.h"
+static HRESULT BalBaseBAFunctionsProcOnThemeLoaded(
+    __in IBAFunctions* pBAFunctions,
+    __in BA_FUNCTIONS_ONTHEMELOADED_ARGS* pArgs,
+    __inout BA_FUNCTIONS_ONTHEMELOADED_RESULTS* /*pResults*/
+    )
+{
+    return pBAFunctions->OnThemeLoaded(pArgs->pTheme, pArgs->pWixLoc);
+}
+static HRESULT BalBaseBAFunctionsProcWndProc(
+    __in IBAFunctions* pBAFunctions,
+    __in BA_FUNCTIONS_WNDPROC_ARGS* pArgs,
+    __inout BA_FUNCTIONS_WNDPROC_RESULTS* pResults
+    )
+{
+    return pBAFunctions->WndProc(pArgs->pTheme, pArgs->hWnd, pArgs->uMsg, pArgs->wParam, pArgs->lParam, &pResults->lres);
+}
+/*******************************************************************
+BalBaseBAFunctionsProc - requires pvContext to be of type IBAFunctions.
+Provides a default mapping between the message based BAFunctions interface and
+the COM-based BAFunctions interface.
+*******************************************************************/
+static HRESULT WINAPI BalBaseBAFunctionsProc(
+    __in BA_FUNCTIONS_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    )
+{
+    IBAFunctions* pBAFunctions = reinterpret_cast<IBAFunctions*>(pvContext);
+    HRESULT hr = pBAFunctions->BAFunctionsProc(message, pvArgs, pvResults, pvContext);
+    if (E_NOTIMPL == hr)
+    {
+        switch (message)
+        {
+        case BA_FUNCTIONS_MESSAGE_ONDETECTBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONPLANCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONSTARTUP:
+        case BA_FUNCTIONS_MESSAGE_ONSHUTDOWN:
+        case BA_FUNCTIONS_MESSAGE_ONSYSTEMSHUTDOWN:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTFORWARDCOMPATIBLEBUNDLE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTUPDATEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTUPDATE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTUPDATECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDBUNDLE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTPACKAGEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTRELATEDMSIPACKAGE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTPATCHTARGET:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTMSIFEATURE:
+        case BA_FUNCTIONS_MESSAGE_ONDETECTPACKAGECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANRELATEDBUNDLE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANPACKAGEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONPLANPATCHTARGET:
+        case BA_FUNCTIONS_MESSAGE_ONPLANMSIFEATURE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANPACKAGECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONAPPLYBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONELEVATEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONELEVATECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPROGRESS:
+        case BA_FUNCTIONS_MESSAGE_ONERROR:
+        case BA_FUNCTIONS_MESSAGE_ONREGISTERBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONREGISTERCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEPACKAGEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEACQUIREBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEACQUIREPROGRESS:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEACQUIRERESOLVING:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEACQUIRECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEVERIFYBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEVERIFYCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONCACHEPACKAGECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONCACHECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEPACKAGEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEPATCHTARGET:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEPROGRESS:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEMSIMESSAGE:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEFILESINUSE:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTEPACKAGECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONEXECUTECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONUNREGISTERBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONUNREGISTERCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONAPPLYCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONLAUNCHAPPROVEDEXEBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONLAUNCHAPPROVEDEXECOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANMSIPACKAGE:
+        case BA_FUNCTIONS_MESSAGE_ONBEGINMSITRANSACTIONBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONBEGINMSITRANSACTIONCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONCOMMITMSITRANSACTIONBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONCOMMITMSITRANSACTIONCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONROLLBACKMSITRANSACTIONBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONROLLBACKMSITRANSACTIONCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPAUSEAUTOMATICUPDATESBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONPAUSEAUTOMATICUPDATESCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONSYSTEMRESTOREPOINTBEGIN:
+        case BA_FUNCTIONS_MESSAGE_ONSYSTEMRESTOREPOINTCOMPLETE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANNEDPACKAGE:
+        case BA_FUNCTIONS_MESSAGE_ONPLANFORWARDCOMPATIBLEBUNDLE:
+            hr = BalBaseBootstrapperApplicationProc((BOOTSTRAPPER_APPLICATION_MESSAGE)message, pvArgs, pvResults, pvContext);
+            break;
+        case BA_FUNCTIONS_MESSAGE_ONTHEMELOADED:
+            hr = BalBaseBAFunctionsProcOnThemeLoaded(pBAFunctions, reinterpret_cast<BA_FUNCTIONS_ONTHEMELOADED_ARGS*>(pvArgs), reinterpret_cast<BA_FUNCTIONS_ONTHEMELOADED_RESULTS*>(pvResults));
+            break;
+        case BA_FUNCTIONS_MESSAGE_WNDPROC:
+            hr = BalBaseBAFunctionsProcWndProc(pBAFunctions, reinterpret_cast<BA_FUNCTIONS_WNDPROC_ARGS*>(pvArgs), reinterpret_cast<BA_FUNCTIONS_WNDPROC_RESULTS*>(pvResults));
+            break;
+        }
+    }
+    return hr;
+}
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
new file mode 100644
index 00000000..bf21c4a5
--- /dev/null
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplication.h
@@ -0,0 +1,1076 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <msiquery.h>
+#include "BootstrapperEngine.h"
+#include "BootstrapperApplication.h"
+#include "IBootstrapperEngine.h"
+#include "IBootstrapperApplication.h"
+#include "balutil.h"
+#include "balretry.h"
+class CBalBaseBootstrapperApplication : public IBootstrapperApplication
+{
+public: // IUnknown
+    virtual STDMETHODIMP QueryInterface(
+        __in REFIID riid,
+        __out LPVOID *ppvObject
+        )
+    {
+        if (!ppvObject)
+        {
+            return E_INVALIDARG;
+        }
+        *ppvObject = NULL;
+        if (::IsEqualIID(__uuidof(IBootstrapperApplication), riid))
+        {
+            *ppvObject = static_cast<IBootstrapperApplication*>(this);
+        }
+        else if (::IsEqualIID(IID_IUnknown, riid))
+        {
+            *ppvObject = static_cast<IUnknown*>(this);
+        }
+        else // no interface for requested iid
+        {
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+    virtual STDMETHODIMP_(ULONG) AddRef()
+    {
+        return ::InterlockedIncrement(&this->m_cReferences);
+    }
+    virtual STDMETHODIMP_(ULONG) Release()
+    {
+        long l = ::InterlockedDecrement(&this->m_cReferences);
+        if (0 < l)
+        {
+            return l;
+        }
+        delete this;
+        return 0;
+    }
+public: // IBootstrapperApplication
+    virtual STDMETHODIMP_(HRESULT) BAProc(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+        return E_NOTIMPL;
+    }
+    virtual STDMETHODIMP_(void) BAProcFallback(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __inout HRESULT* /*phr*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+    }
+    virtual STDMETHODIMP OnStartup()
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnShutdown(
+        __inout BOOTSTRAPPER_SHUTDOWN_ACTION* /*pAction*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemShutdown(
+        __in DWORD dwEndSession,
+        __inout BOOL* pfCancel
+        )
+    {
+        HRESULT hr = S_OK;
+        // Allow requests to shut down when critical or not applying.
+        *pfCancel = !(ENDSESSION_CRITICAL & dwEndSession || !m_fApplying);
+        return hr;
+    }
+    virtual STDMETHODIMP OnDetectBegin(
+        __in BOOL /*fCached*/,
+        __in BOOL /*fInstalled*/,
+        __in DWORD /*cPackages*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectForwardCompatibleBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOL /*fMissingFromCache*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdateBegin(
+        __in_z LPCWSTR /*wzUpdateLocation*/,
+        __inout BOOL* pfCancel,
+        __inout BOOL* /*pfSkip*/
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdate(
+        __in_z LPCWSTR /*wzUpdateLocation*/,
+        __in DWORD64 /*dw64Size*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in_z LPCWSTR /*wzTitle*/,
+        __in_z LPCWSTR /*wzSummary*/,
+        __in_z LPCWSTR /*wzContentType*/,
+        __in_z LPCWSTR /*wzContent*/,
+        __inout BOOL* pfCancel,
+        __inout BOOL* /*pfStopProcessingUpdates*/
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectUpdateComplete(
+        __in HRESULT /*hrStatus*/,
+        __inout BOOL* /*pfIgnoreError*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectRelatedBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
+        __in BOOL /*fMissingFromCache*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectRelatedMsiPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzUpgradeCode*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
+        __inout BOOL* pfCancel
+        ) 
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*patchState*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectMsiFeature(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzFeatureId*/,
+        __in BOOTSTRAPPER_FEATURE_STATE /*state*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectPackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*state*/,
+        __in BOOL /*fCached*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnDetectComplete(
+        __in HRESULT /*hrStatus*/,
+        __in BOOL /*fEligibleForCleanup*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanBegin(
+        __in DWORD /*cPackages*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanRelatedBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOTSTRAPPER_PACKAGE_STATE /*state*/,
+        __in BOOL /*fCached*/,
+        __in BOOTSTRAPPER_PACKAGE_CONDITION_RESULT /*installCondition*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __in BOOTSTRAPPER_CACHE_TYPE /*recommendedCacheType*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestState*/,
+        __inout BOOTSTRAPPER_CACHE_TYPE* /*pRequestedCacheType*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzProductCode*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanMsiFeature(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzFeatureId*/,
+        __in BOOTSTRAPPER_FEATURE_STATE /*recommendedState*/,
+        __inout BOOTSTRAPPER_FEATURE_STATE* /*pRequestedState*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanMsiPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOL /*fExecute*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*action*/,
+        __inout BOOL* pfCancel,
+        __inout BURN_MSI_PROPERTY* /*pActionMsiProperty*/,
+        __inout INSTALLUILEVEL* /*pUiLevel*/,
+        __inout BOOL* /*pfDisableExternalUiHandler*/
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanPackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_REQUEST_STATE /*requested*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlannedPackage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*execute*/,
+        __in BOOTSTRAPPER_ACTION_STATE /*rollback*/,
+        __in BOOL /*fPlannedCache*/,
+        __in BOOL /*fPlannedUncache*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnApplyBegin(
+        __in DWORD /*dwPhaseCount*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        m_fApplying = TRUE;
+        m_dwProgressPercentage = 0;
+        m_dwOverallProgressPercentage = 0;
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnElevateBegin(
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnElevateComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnProgress(
+        __in DWORD dwProgressPercentage,
+        __in DWORD dwOverallProgressPercentage,
+        __inout BOOL* pfCancel
+        )
+    {
+        HRESULT hr = S_OK;
+        int nResult = IDNOACTION;
+        m_dwProgressPercentage = dwProgressPercentage;
+        m_dwOverallProgressPercentage = dwOverallProgressPercentage;
+        if (BOOTSTRAPPER_DISPLAY_EMBEDDED == m_display)
+        {
+            hr = m_pEngine->SendEmbeddedProgress(m_dwProgressPercentage, m_dwOverallProgressPercentage, &nResult);
+            BalExitOnFailure(hr, "Failed to send embedded overall progress.");
+            if (IDERROR == nResult)
+            {
+                hr = E_FAIL;
+            }
+            else if (IDCANCEL == nResult)
+            {
+                *pfCancel = TRUE;
+            }
+        }
+    LExit:
+        *pfCancel |= CheckCanceled();
+        return hr;
+    }
+    virtual STDMETHODIMP OnError(
+        __in BOOTSTRAPPER_ERROR_TYPE errorType,
+        __in_z LPCWSTR wzPackageId,
+        __in DWORD dwCode,
+        __in_z LPCWSTR /*wzError*/,
+        __in DWORD /*dwUIHint*/,
+        __in DWORD /*cData*/,
+        __in_ecount_z_opt(cData) LPCWSTR* /*rgwzData*/,
+        __in int /*nRecommendation*/,
+        __inout int* pResult
+        )
+    {
+        BalRetryErrorOccurred(wzPackageId, dwCode);
+        if (CheckCanceled())
+        {
+            *pResult = IDCANCEL;
+        }
+        else if (BOOTSTRAPPER_DISPLAY_FULL == m_display)
+        {
+            if (BOOTSTRAPPER_ERROR_TYPE_HTTP_AUTH_SERVER == errorType || BOOTSTRAPPER_ERROR_TYPE_HTTP_AUTH_PROXY == errorType)
+            {
+                *pResult = IDTRYAGAIN;
+            }
+        }
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRegisterBegin(
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRegisterComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheBegin(
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePackageBegin(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*cCachePayloads*/,
+        __in DWORD64 /*dw64PackageCacheSize*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireBegin(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR /*wzSource*/,
+        __in_z_opt LPCWSTR /*wzDownloadUrl*/,
+        __in_z_opt LPCWSTR /*wzPayloadContainerId*/,
+        __in BOOTSTRAPPER_CACHE_OPERATION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHE_OPERATION* /*pAction*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        BalRetryStartContainerOrPayload(wzPackageOrContainerId, wzPayloadId);
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireProgress(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        HRESULT hr = S_OK;
+        int nResult = IDNOACTION;
+        // Send progress even though we don't update the numbers to at least give the caller an opportunity
+        // to cancel.
+        if (BOOTSTRAPPER_DISPLAY_EMBEDDED == m_display)
+        {
+            hr = m_pEngine->SendEmbeddedProgress(m_dwProgressPercentage, m_dwOverallProgressPercentage, &nResult);
+            BalExitOnFailure(hr, "Failed to send embedded cache progress.");
+            if (IDERROR == nResult)
+            {
+                hr = E_FAIL;
+            }
+            else if (IDCANCEL == nResult)
+            {
+                *pfCancel = TRUE;
+            }
+        }
+    LExit:
+        *pfCancel |= CheckCanceled();
+        return hr;
+    }
+    virtual STDMETHODIMP OnCacheAcquireResolving(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in_z LPCWSTR* /*rgSearchPaths*/,
+        __in DWORD /*cSearchPaths*/,
+        __in BOOL /*fFoundLocal*/,
+        __in DWORD /*dwRecommendedSearchPath*/,
+        __in_z_opt LPCWSTR /*wzDownloadUrl*/,
+        __in_z_opt LPCWSTR /*wzPayloadContainerId*/,
+        __in BOOTSTRAPPER_CACHE_RESOLVE_OPERATION /*recommendation*/,
+        __inout DWORD* /*pdwChosenSearchPath*/,
+        __inout BOOTSTRAPPER_CACHE_RESOLVE_OPERATION* /*pAction*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheAcquireComplete(
+        __in_z LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION* pAction
+        )
+    {
+        HRESULT hr = S_OK;
+        BOOL fRetry = FALSE;
+        if (CheckCanceled())
+        {
+            ExitFunction1(hr = HRESULT_FROM_WIN32(ERROR_INSTALL_USEREXIT));
+        }
+        hr = BalRetryEndContainerOrPayload(wzPackageOrContainerId, wzPayloadId, hrStatus, &fRetry);
+        ExitOnFailure(hr, "BalRetryEndPackage for cache failed");
+        if (fRetry)
+        {
+            *pAction = BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION_RETRY;
+        }
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP OnCacheVerifyBegin(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheVerifyProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __in BOOTSTRAPPER_CACHE_VERIFY_STEP /*verifyStep*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheVerifyComplete(
+        __in_z LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION* pAction
+        )
+    {
+        if (CheckCanceled())
+        {
+            *pAction = BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION_NONE;
+        }
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePackageComplete(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION* pAction
+        )
+    {
+        if (CheckCanceled())
+        {
+            *pAction = BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION_NONE;
+        }
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteBegin(
+        __in DWORD /*cExecutingPackages*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePackageBegin(
+        __in_z LPCWSTR wzPackageId,
+        __in BOOL fExecute,
+        __in BOOTSTRAPPER_ACTION_STATE /*action*/,
+        __in INSTALLUILEVEL /*uiLevel*/,
+        __in BOOL /*fDisableExternalUiHandler*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        // Only track retry on execution (not rollback).
+        if (fExecute)
+        {
+            BalRetryStartPackage(wzPackageId);
+        }
+        m_fRollingBack = !fExecute;
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePatchTarget(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in_z LPCWSTR /*wzTargetProductCode*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteProgress(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*dwProgressPercentage*/,
+        __in DWORD /*dwOverallProgressPercentage*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        HRESULT hr = S_OK;
+        int nResult = IDNOACTION;
+        // Send progress even though we don't update the numbers to at least give the caller an opportunity
+        // to cancel.
+        if (BOOTSTRAPPER_DISPLAY_EMBEDDED == m_display)
+        {
+            hr = m_pEngine->SendEmbeddedProgress(m_dwProgressPercentage, m_dwOverallProgressPercentage, &nResult);
+            BalExitOnFailure(hr, "Failed to send embedded execute progress.");
+            if (IDERROR == nResult)
+            {
+                hr = E_FAIL;
+            }
+            else if (IDCANCEL == nResult)
+            {
+                *pfCancel = TRUE;
+            }
+        }
+    LExit:
+        *pfCancel |= CheckCanceled();
+        return hr;
+    }
+    virtual STDMETHODIMP OnExecuteMsiMessage(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in INSTALLMESSAGE /*messageType*/,
+        __in DWORD /*dwUIHint*/,
+        __in_z LPCWSTR /*wzMessage*/,
+        __in DWORD /*cData*/,
+        __in_ecount_z_opt(cData) LPCWSTR* /*rgwzData*/,
+        __in int /*nRecommendation*/,
+        __inout int* pResult
+        )
+    {
+        if (CheckCanceled())
+        {
+            *pResult = IDCANCEL;
+        }
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecuteFilesInUse(
+        __in_z LPCWSTR /*wzPackageId*/,
+        __in DWORD /*cFiles*/,
+        __in_ecount_z(cFiles) LPCWSTR* /*rgwzFiles*/,
+        __in int /*nRecommendation*/,
+        __inout int* pResult
+        )
+    {
+        if (CheckCanceled())
+        {
+            *pResult = IDCANCEL;
+        }
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnExecutePackageComplete(
+        __in_z LPCWSTR wzPackageId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_APPLY_RESTART /*restart*/,
+        __in BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION* pAction
+        )
+    {
+        HRESULT hr = S_OK;
+        BOOL fRetry = FALSE;
+        if (CheckCanceled())
+        {
+            ExitFunction1(hr = HRESULT_FROM_WIN32(ERROR_INSTALL_USEREXIT));
+        }
+        hr = BalRetryEndPackage(wzPackageId, hrStatus, &fRetry);
+        ExitOnFailure(hr, "BalRetryEndPackage for execute failed");
+        if (fRetry)
+        {
+            *pAction = BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION_RETRY;
+        }
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP OnExecuteComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnUnregisterBegin(
+        __in BOOL /*fKeepRegistration*/,
+        __inout BOOL* /*pfForceKeepRegistration*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnUnregisterComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnApplyComplete(
+        __in HRESULT /*hrStatus*/,
+        __in BOOTSTRAPPER_APPLY_RESTART restart,
+        __in BOOTSTRAPPER_APPLYCOMPLETE_ACTION /*recommendation*/,
+        __inout BOOTSTRAPPER_APPLYCOMPLETE_ACTION* pAction
+        )
+    {
+        HRESULT hr = S_OK;
+        BOOL fRestartRequired = BOOTSTRAPPER_APPLY_RESTART_REQUIRED == restart;
+        BOOL fShouldBlockRestart = BOOTSTRAPPER_DISPLAY_FULL <= m_display && BOOTSTRAPPER_RESTART_PROMPT >= m_restart;
+        if (fRestartRequired && !fShouldBlockRestart)
+        {
+            *pAction = BOOTSTRAPPER_APPLYCOMPLETE_ACTION_RESTART;
+        }
+        m_fApplying = FALSE;
+        return hr;
+    }
+    virtual STDMETHODIMP OnLaunchApprovedExeBegin(
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnLaunchApprovedExeComplete(
+        __in HRESULT /*hrStatus*/,
+        __in DWORD /*dwProcessId*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnBeginMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnBeginMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCommitMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCommitMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRollbackMsiTransactionBegin(
+        __in_z LPCWSTR /*wzTransactionId*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnRollbackMsiTransactionComplete(
+        __in_z LPCWSTR /*wzTransactionId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPauseAutomaticUpdatesBegin(
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPauseAutomaticUpdatesComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemRestorePointBegin(
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnSystemRestorePointComplete(
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnPlanForwardCompatibleBundle(
+        __in_z LPCWSTR /*wzBundleId*/,
+        __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
+        __in_z LPCWSTR /*wzBundleTag*/,
+        __in BOOL /*fPerMachine*/,
+        __in LPCWSTR /*wzVersion*/,
+        __in BOOL /*fRecommendedIgnoreBundle*/,
+        __inout BOOL* pfCancel,
+        __inout BOOL* /*pfIgnoreBundle*/
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyBegin(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCacheContainerOrPayloadVerifyComplete(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractBegin(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractProgress(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in DWORD64 /*dw64Progress*/,
+        __in DWORD64 /*dw64Total*/,
+        __in DWORD /*dwOverallPercentage*/,
+        __inout BOOL* pfCancel
+        )
+    {
+        *pfCancel |= CheckCanceled();
+        return S_OK;
+    }
+    virtual STDMETHODIMP OnCachePayloadExtractComplete(
+        __in_z_opt LPCWSTR /*wzPackageOrContainerId*/,
+        __in_z_opt LPCWSTR /*wzPayloadId*/,
+        __in HRESULT /*hrStatus*/
+        )
+    {
+        return S_OK;
+    }
+protected:
+    //
+    // PromptCancel - prompts the user to close (if not forced).
+    //
+    virtual BOOL PromptCancel(
+        __in HWND hWnd,
+        __in BOOL fForceCancel,
+        __in_z_opt LPCWSTR wzMessage,
+        __in_z_opt LPCWSTR wzCaption
+        )
+    {
+        ::EnterCriticalSection(&m_csCanceled);
+        // Only prompt the user to close if we have not canceled already.
+        if (!m_fCanceled)
+        {
+            if (fForceCancel)
+            {
+                m_fCanceled = TRUE;
+            }
+            else
+            {
+                m_fCanceled = (IDYES == ::MessageBoxW(hWnd, wzMessage, wzCaption, MB_YESNO | MB_ICONEXCLAMATION));
+            }
+        }
+        ::LeaveCriticalSection(&m_csCanceled);
+        return m_fCanceled;
+    }
+    //
+    // CheckCanceled - waits if the cancel dialog is up and checks to see if the user canceled the operation.
+    //
+    BOOL CheckCanceled()
+    {
+        ::EnterCriticalSection(&m_csCanceled);
+        ::LeaveCriticalSection(&m_csCanceled);
+        return m_fRollingBack ? FALSE : m_fCanceled;
+    }
+    BOOL IsRollingBack()
+    {
+        return m_fRollingBack;
+    }
+    BOOL IsCanceled()
+    {
+        return m_fCanceled;
+    }
+    CBalBaseBootstrapperApplication(
+        __in IBootstrapperEngine* pEngine,
+        __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+        __in DWORD dwRetryCount = 0,
+        __in DWORD dwRetryTimeout = 1000
+        )
+    {
+        m_cReferences = 1;
+        m_display = pArgs->pCommand->display;
+        m_restart = pArgs->pCommand->restart;
+        pEngine->AddRef();
+        m_pEngine = pEngine;
+        ::InitializeCriticalSection(&m_csCanceled);
+        m_fCanceled = FALSE;
+        m_fApplying = FALSE;
+        m_fRollingBack = FALSE;
+        m_dwProgressPercentage = 0;
+        m_dwOverallProgressPercentage = 0;
+        BalRetryInitialize(dwRetryCount, dwRetryTimeout);
+    }
+    virtual ~CBalBaseBootstrapperApplication()
+    {
+        BalRetryUninitialize();
+        ::DeleteCriticalSection(&m_csCanceled);
+        ReleaseNullObject(m_pEngine);
+    }
+protected:
+    CRITICAL_SECTION m_csCanceled;
+    BOOL m_fCanceled;
+private:
+    long m_cReferences;
+    BOOTSTRAPPER_DISPLAY m_display;
+    BOOTSTRAPPER_RESTART m_restart;
+    IBootstrapperEngine* m_pEngine;
+    BOOL m_fApplying;
+    BOOL m_fRollingBack;
+    DWORD m_dwProgressPercentage;
+    DWORD m_dwOverallProgressPercentage;
+};
diff --git a/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
new file mode 100644
index 00000000..7fe3ffd8
--- /dev/null
+++ b/src/api/burn/balutil/inc/BalBaseBootstrapperApplicationProc.h
@@ -0,0 +1,901 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include "BootstrapperEngine.h"
+#include "BootstrapperApplication.h"
+#include "IBootstrapperEngine.h"
+#include "IBootstrapperApplication.h"
+static HRESULT BalBaseBAProcOnDetectBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTBEGIN_ARGS* pArgs,
+    __inout BA_ONDETECTBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectBegin(pArgs->fCached, pArgs->fInstalled, pArgs->cPackages, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTCOMPLETE_ARGS* pArgs,
+    __inout BA_ONDETECTCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnDetectComplete(pArgs->hrStatus, pArgs->fEligibleForCleanup);
+}
+static HRESULT BalBaseBAProcOnPlanBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANBEGIN_ARGS* pArgs,
+    __inout BA_ONPLANBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanBegin(pArgs->cPackages, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnPlanComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANCOMPLETE_ARGS* pArgs,
+    __inout BA_ONPLANCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnPlanComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnStartup(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONSTARTUP_ARGS* /*pArgs*/,
+    __inout BA_ONSTARTUP_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnStartup();
+}
+static HRESULT BalBaseBAProcOnShutdown(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONSHUTDOWN_ARGS* /*pArgs*/,
+    __inout BA_ONSHUTDOWN_RESULTS* pResults
+    )
+{
+    return pBA->OnShutdown(&pResults->action);
+}
+static HRESULT BalBaseBAProcOnSystemShutdown(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONSYSTEMSHUTDOWN_ARGS* pArgs,
+    __inout BA_ONSYSTEMSHUTDOWN_RESULTS* pResults
+    )
+{
+    return pBA->OnSystemShutdown(pArgs->dwEndSession, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectForwardCompatibleBundle(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_ARGS* pArgs,
+    __inout BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectForwardCompatibleBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->wzVersion, pArgs->fMissingFromCache, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectUpdateBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTUPDATEBEGIN_ARGS* pArgs,
+    __inout BA_ONDETECTUPDATEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectUpdateBegin(pArgs->wzUpdateLocation, &pResults->fCancel, &pResults->fSkip);
+}
+static HRESULT BalBaseBAProcOnDetectUpdate(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTUPDATE_ARGS* pArgs,
+    __inout BA_ONDETECTUPDATE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectUpdate(pArgs->wzUpdateLocation, pArgs->dw64Size, pArgs->wzVersion, pArgs->wzTitle, pArgs->wzSummary, pArgs->wzContentType, pArgs->wzContent, &pResults->fCancel, &pResults->fStopProcessingUpdates);
+}
+static HRESULT BalBaseBAProcOnDetectUpdateComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTUPDATECOMPLETE_ARGS* pArgs,
+    __inout BA_ONDETECTUPDATECOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectUpdateComplete(pArgs->hrStatus, &pResults->fIgnoreError);
+}
+static HRESULT BalBaseBAProcOnDetectRelatedBundle(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTRELATEDBUNDLE_ARGS* pArgs,
+    __inout BA_ONDETECTRELATEDBUNDLE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectRelatedBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->wzVersion, pArgs->operation, pArgs->fMissingFromCache, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectPackageBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTPACKAGEBEGIN_ARGS* pArgs,
+    __inout BA_ONDETECTPACKAGEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectPackageBegin(pArgs->wzPackageId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectRelatedMsiPackage(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTRELATEDMSIPACKAGE_ARGS* pArgs,
+    __inout BA_ONDETECTRELATEDMSIPACKAGE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectRelatedMsiPackage(pArgs->wzPackageId, pArgs->wzUpgradeCode, pArgs->wzProductCode, pArgs->fPerMachine, pArgs->wzVersion, pArgs->operation, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectPatchTarget(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTPATCHTARGET_ARGS* pArgs,
+    __inout BA_ONDETECTPATCHTARGET_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectPatchTarget(pArgs->wzPackageId, pArgs->wzProductCode, pArgs->patchState, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectMsiFeature(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTMSIFEATURE_ARGS* pArgs,
+    __inout BA_ONDETECTMSIFEATURE_RESULTS* pResults
+    )
+{
+    return pBA->OnDetectMsiFeature(pArgs->wzPackageId, pArgs->wzFeatureId, pArgs->state, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnDetectPackageComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONDETECTPACKAGECOMPLETE_ARGS* pArgs,
+    __inout BA_ONDETECTPACKAGECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnDetectPackageComplete(pArgs->wzPackageId, pArgs->hrStatus, pArgs->state, pArgs->fCached);
+}
+static HRESULT BalBaseBAProcOnPlanRelatedBundle(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANRELATEDBUNDLE_ARGS* pArgs,
+    __inout BA_ONPLANRELATEDBUNDLE_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanRelatedBundle(pArgs->wzBundleId, pArgs->recommendedState, &pResults->requestedState, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnPlanPackageBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANPACKAGEBEGIN_ARGS* pArgs,
+    __inout BA_ONPLANPACKAGEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanPackageBegin(pArgs->wzPackageId, pArgs->state, pArgs->fCached, pArgs->installCondition, pArgs->recommendedState, pArgs->recommendedCacheType, &pResults->requestedState, &pResults->requestedCacheType, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnPlanPatchTarget(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANPATCHTARGET_ARGS* pArgs,
+    __inout BA_ONPLANPATCHTARGET_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanPatchTarget(pArgs->wzPackageId, pArgs->wzProductCode, pArgs->recommendedState, &pResults->requestedState, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnPlanMsiFeature(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANMSIFEATURE_ARGS* pArgs,
+    __inout BA_ONPLANMSIFEATURE_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanMsiFeature(pArgs->wzPackageId, pArgs->wzFeatureId, pArgs->recommendedState, &pResults->requestedState, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnPlanPackageComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANPACKAGECOMPLETE_ARGS* pArgs,
+    __inout BA_ONPLANPACKAGECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnPlanPackageComplete(pArgs->wzPackageId, pArgs->hrStatus, pArgs->requested);
+}
+static HRESULT BalBaseBAProcOnPlannedPackage(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANNEDPACKAGE_ARGS* pArgs,
+    __inout BA_ONPLANNEDPACKAGE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnPlannedPackage(pArgs->wzPackageId, pArgs->execute, pArgs->rollback, pArgs->fPlannedCache, pArgs->fPlannedUncache);
+}
+static HRESULT BalBaseBAProcOnApplyBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONAPPLYBEGIN_ARGS* pArgs,
+    __inout BA_ONAPPLYBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnApplyBegin(pArgs->dwPhaseCount, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnElevateBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONELEVATEBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONELEVATEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnElevateBegin(&pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnElevateComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONELEVATECOMPLETE_ARGS* pArgs,
+    __inout BA_ONELEVATECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnElevateComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPROGRESS_ARGS* pArgs,
+    __inout BA_ONPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnProgress(pArgs->dwProgressPercentage, pArgs->dwOverallPercentage, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnError(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONERROR_ARGS* pArgs,
+    __inout BA_ONERROR_RESULTS* pResults
+    )
+{
+    return pBA->OnError(pArgs->errorType, pArgs->wzPackageId, pArgs->dwCode, pArgs->wzError, pArgs->dwUIHint, pArgs->cData, pArgs->rgwzData, pArgs->nRecommendation, &pResults->nResult);
+}
+static HRESULT BalBaseBAProcOnRegisterBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONREGISTERBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONREGISTERBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnRegisterBegin(&pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnRegisterComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONREGISTERCOMPLETE_ARGS* pArgs,
+    __inout BA_ONREGISTERCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnRegisterComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnCacheBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONCACHEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheBegin(&pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCachePackageBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEPACKAGEBEGIN_ARGS* pArgs,
+    __inout BA_ONCACHEPACKAGEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCachePackageBegin(pArgs->wzPackageId, pArgs->cCachePayloads, pArgs->dw64PackageCacheSize, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheAcquireBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEACQUIREBEGIN_ARGS* pArgs,
+    __inout BA_ONCACHEACQUIREBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheAcquireBegin(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->wzSource, pArgs->wzDownloadUrl, pArgs->wzPayloadContainerId, pArgs->recommendation, &pResults->action, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheAcquireProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEACQUIREPROGRESS_ARGS* pArgs,
+    __inout BA_ONCACHEACQUIREPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheAcquireProgress(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->dw64Progress, pArgs->dw64Total, pArgs->dwOverallPercentage, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheAcquireResolving(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEACQUIRERESOLVING_ARGS* pArgs,
+    __inout BA_ONCACHEACQUIRERESOLVING_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheAcquireResolving(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->rgSearchPaths, pArgs->cSearchPaths, pArgs->fFoundLocal, pArgs->dwRecommendedSearchPath, pArgs->wzDownloadUrl, pArgs->wzPayloadContainerId, pArgs->recommendation, &pResults->dwChosenSearchPath, &pResults->action, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheAcquireComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEACQUIRECOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHEACQUIRECOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheAcquireComplete(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->hrStatus, pArgs->recommendation, &pResults->action);
+}
+static HRESULT BalBaseBAProcOnCacheVerifyBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEVERIFYBEGIN_ARGS* pArgs,
+    __inout BA_ONCACHEVERIFYBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheVerifyBegin(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheVerifyProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEVERIFYPROGRESS_ARGS* pArgs,
+    __inout BA_ONCACHEVERIFYPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheVerifyProgress(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->dw64Progress, pArgs->dw64Total, pArgs->dwOverallPercentage, pArgs->verifyStep, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheVerifyComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEVERIFYCOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHEVERIFYCOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheVerifyComplete(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->hrStatus, pArgs->recommendation, &pResults->action);
+}
+static HRESULT BalBaseBAProcOnCachePackageComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEPACKAGECOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHEPACKAGECOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnCachePackageComplete(pArgs->wzPackageId, pArgs->hrStatus, pArgs->recommendation, &pResults->action);
+}
+static HRESULT BalBaseBAProcOnCacheComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHECOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnCacheComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnExecuteBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEBEGIN_ARGS* pArgs,
+    __inout BA_ONEXECUTEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnExecuteBegin(pArgs->cExecutingPackages, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnExecutePackageBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEPACKAGEBEGIN_ARGS* pArgs,
+    __inout BA_ONEXECUTEPACKAGEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnExecutePackageBegin(pArgs->wzPackageId, pArgs->fExecute, pArgs->action, pArgs->uiLevel, pArgs->fDisableExternalUiHandler, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnExecutePatchTarget(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEPATCHTARGET_ARGS* pArgs,
+    __inout BA_ONEXECUTEPATCHTARGET_RESULTS* pResults
+    )
+{
+    return pBA->OnExecutePatchTarget(pArgs->wzPackageId, pArgs->wzTargetProductCode, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnExecuteProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEPROGRESS_ARGS* pArgs,
+    __inout BA_ONEXECUTEPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnExecuteProgress(pArgs->wzPackageId, pArgs->dwProgressPercentage, pArgs->dwOverallPercentage, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnExecuteMsiMessage(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEMSIMESSAGE_ARGS* pArgs,
+    __inout BA_ONEXECUTEMSIMESSAGE_RESULTS* pResults
+    )
+{
+    return pBA->OnExecuteMsiMessage(pArgs->wzPackageId, pArgs->messageType, pArgs->dwUIHint, pArgs->wzMessage, pArgs->cData, pArgs->rgwzData, pArgs->nRecommendation, &pResults->nResult);
+}
+static HRESULT BalBaseBAProcOnExecuteFilesInUse(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEFILESINUSE_ARGS* pArgs,
+    __inout BA_ONEXECUTEFILESINUSE_RESULTS* pResults
+    )
+{
+    return pBA->OnExecuteFilesInUse(pArgs->wzPackageId, pArgs->cFiles, pArgs->rgwzFiles, pArgs->nRecommendation, &pResults->nResult);
+}
+static HRESULT BalBaseBAProcOnExecutePackageComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTEPACKAGECOMPLETE_ARGS* pArgs,
+    __inout BA_ONEXECUTEPACKAGECOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnExecutePackageComplete(pArgs->wzPackageId, pArgs->hrStatus, pArgs->restart, pArgs->recommendation, &pResults->action);
+}
+static HRESULT BalBaseBAProcOnExecuteComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONEXECUTECOMPLETE_ARGS* pArgs,
+    __inout BA_ONEXECUTECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnExecuteComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnUnregisterBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONUNREGISTERBEGIN_ARGS* pArgs,
+    __inout BA_ONUNREGISTERBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnUnregisterBegin(pArgs->fKeepRegistration, &pResults->fForceKeepRegistration);
+}
+static HRESULT BalBaseBAProcOnUnregisterComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONUNREGISTERCOMPLETE_ARGS* pArgs,
+    __inout BA_ONUNREGISTERCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnUnregisterComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnApplyComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONAPPLYCOMPLETE_ARGS* pArgs,
+    __inout BA_ONAPPLYCOMPLETE_RESULTS* pResults
+    )
+{
+    return pBA->OnApplyComplete(pArgs->hrStatus, pArgs->restart, pArgs->recommendation, &pResults->action);
+}
+static HRESULT BalBaseBAProcOnLaunchApprovedExeBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONLAUNCHAPPROVEDEXEBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONLAUNCHAPPROVEDEXEBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnLaunchApprovedExeBegin(&pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnLaunchApprovedExeComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONLAUNCHAPPROVEDEXECOMPLETE_ARGS* pArgs,
+    __inout BA_ONLAUNCHAPPROVEDEXECOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnLaunchApprovedExeComplete(pArgs->hrStatus, pArgs->dwProcessId);
+}
+static HRESULT BalBaseBAProcOnPlanMsiPackage(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANMSIPACKAGE_ARGS* pArgs,
+    __inout BA_ONPLANMSIPACKAGE_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanMsiPackage(pArgs->wzPackageId, pArgs->fExecute, pArgs->action, &pResults->fCancel, &pResults->actionMsiProperty, &pResults->uiLevel, &pResults->fDisableExternalUiHandler);
+}
+static HRESULT BalBaseBAProcOnBeginMsiTransactionBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONBEGINMSITRANSACTIONBEGIN_ARGS* pArgs,
+    __inout BA_ONBEGINMSITRANSACTIONBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnBeginMsiTransactionBegin(pArgs->wzTransactionId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnBeginMsiTransactionComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONBEGINMSITRANSACTIONCOMPLETE_ARGS* pArgs,
+    __inout BA_ONBEGINMSITRANSACTIONCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnBeginMsiTransactionComplete(pArgs->wzTransactionId, pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnCommitMsiTransactionBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCOMMITMSITRANSACTIONBEGIN_ARGS* pArgs,
+    __inout BA_ONCOMMITMSITRANSACTIONBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCommitMsiTransactionBegin(pArgs->wzTransactionId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCommitMsiTransactionComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCOMMITMSITRANSACTIONCOMPLETE_ARGS* pArgs,
+    __inout BA_ONCOMMITMSITRANSACTIONCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnCommitMsiTransactionComplete(pArgs->wzTransactionId, pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnRollbackMsiTransactionBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONROLLBACKMSITRANSACTIONBEGIN_ARGS* pArgs,
+    __inout BA_ONROLLBACKMSITRANSACTIONBEGIN_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnRollbackMsiTransactionBegin(pArgs->wzTransactionId);
+}
+static HRESULT BalBaseBAProcOnRollbackMsiTransactionComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONROLLBACKMSITRANSACTIONCOMPLETE_ARGS* pArgs,
+    __inout BA_ONROLLBACKMSITRANSACTIONCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnRollbackMsiTransactionComplete(pArgs->wzTransactionId, pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnPauseAutomaticUpdatesBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPAUSEAUTOMATICUPDATESBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONPAUSEAUTOMATICUPDATESBEGIN_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnPauseAutomaticUpdatesBegin();
+}
+static HRESULT BalBaseBAProcOnPauseAutomaticUpdatesComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_ARGS* pArgs,
+    __inout BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnPauseAutomaticUpdatesComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnSystemRestorePointBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONSYSTEMRESTOREPOINTBEGIN_ARGS* /*pArgs*/,
+    __inout BA_ONSYSTEMRESTOREPOINTBEGIN_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnSystemRestorePointBegin();
+}
+static HRESULT BalBaseBAProcOnSystemRestorePointComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONSYSTEMRESTOREPOINTCOMPLETE_ARGS* pArgs,
+    __inout BA_ONSYSTEMRESTOREPOINTCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnSystemRestorePointComplete(pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnPlanForwardCompatibleBundle(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONPLANFORWARDCOMPATIBLEBUNDLE_ARGS* pArgs,
+    __inout BA_ONPLANFORWARDCOMPATIBLEBUNDLE_RESULTS* pResults
+    )
+{
+    return pBA->OnPlanForwardCompatibleBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->wzVersion, pArgs->fRecommendedIgnoreBundle, &pResults->fCancel, &pResults->fIgnoreBundle);
+}
+static HRESULT BalBaseBAProcOnCacheContainerOrPayloadVerifyBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_ARGS* pArgs,
+    __inout BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheContainerOrPayloadVerifyBegin(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheContainerOrPayloadVerifyProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_ARGS* pArgs,
+    __inout BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnCacheContainerOrPayloadVerifyProgress(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->dw64Progress, pArgs->dw64Total, pArgs->dwOverallPercentage, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCacheContainerOrPayloadVerifyComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnCacheContainerOrPayloadVerifyComplete(pArgs->wzPackageOrContainerId, pArgs->wzPayloadId, pArgs->hrStatus);
+}
+static HRESULT BalBaseBAProcOnCachePayloadExtractBegin(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEPAYLOADEXTRACTBEGIN_ARGS* pArgs,
+    __inout BA_ONCACHEPAYLOADEXTRACTBEGIN_RESULTS* pResults
+    )
+{
+    return pBA->OnCachePayloadExtractBegin(pArgs->wzContainerId, pArgs->wzPayloadId, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCachePayloadExtractProgress(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEPAYLOADEXTRACTPROGRESS_ARGS* pArgs,
+    __inout BA_ONCACHEPAYLOADEXTRACTPROGRESS_RESULTS* pResults
+    )
+{
+    return pBA->OnCachePayloadExtractProgress(pArgs->wzContainerId, pArgs->wzPayloadId, pArgs->dw64Progress, pArgs->dw64Total, pArgs->dwOverallPercentage, &pResults->fCancel);
+}
+static HRESULT BalBaseBAProcOnCachePayloadExtractComplete(
+    __in IBootstrapperApplication* pBA,
+    __in BA_ONCACHEPAYLOADEXTRACTCOMPLETE_ARGS* pArgs,
+    __inout BA_ONCACHEPAYLOADEXTRACTCOMPLETE_RESULTS* /*pResults*/
+    )
+{
+    return pBA->OnCachePayloadExtractComplete(pArgs->wzContainerId, pArgs->wzPayloadId, pArgs->hrStatus);
+}
+/*******************************************************************
+BalBaseBootstrapperApplicationProc - requires pvContext to be of type IBootstrapperApplication.
+                                     Provides a default mapping between the new message based BA interface and
+                                     the old COM-based BA interface.
+*******************************************************************/
+static HRESULT WINAPI BalBaseBootstrapperApplicationProc(
+    __in BOOTSTRAPPER_APPLICATION_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    )
+{
+    IBootstrapperApplication* pBA = reinterpret_cast<IBootstrapperApplication*>(pvContext);
+    HRESULT hr = pBA->BAProc(message, pvArgs, pvResults, pvContext);
+    
+    if (E_NOTIMPL == hr)
+    {
+        switch (message)
+        {
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTBEGIN:
+            hr = BalBaseBAProcOnDetectBegin(pBA, reinterpret_cast<BA_ONDETECTBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTCOMPLETE:
+            hr = BalBaseBAProcOnDetectComplete(pBA, reinterpret_cast<BA_ONDETECTCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANBEGIN:
+            hr = BalBaseBAProcOnPlanBegin(pBA, reinterpret_cast<BA_ONPLANBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANCOMPLETE:
+            hr = BalBaseBAProcOnPlanComplete(pBA, reinterpret_cast<BA_ONPLANCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONSTARTUP:
+            hr = BalBaseBAProcOnStartup(pBA, reinterpret_cast<BA_ONSTARTUP_ARGS*>(pvArgs), reinterpret_cast<BA_ONSTARTUP_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONSHUTDOWN:
+            hr = BalBaseBAProcOnShutdown(pBA, reinterpret_cast<BA_ONSHUTDOWN_ARGS*>(pvArgs), reinterpret_cast<BA_ONSHUTDOWN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMSHUTDOWN:
+            hr = BalBaseBAProcOnSystemShutdown(pBA, reinterpret_cast<BA_ONSYSTEMSHUTDOWN_ARGS*>(pvArgs), reinterpret_cast<BA_ONSYSTEMSHUTDOWN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTFORWARDCOMPATIBLEBUNDLE:
+            hr = BalBaseBAProcOnDetectForwardCompatibleBundle(pBA, reinterpret_cast<BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATEBEGIN:
+            hr = BalBaseBAProcOnDetectUpdateBegin(pBA, reinterpret_cast<BA_ONDETECTUPDATEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTUPDATEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATE:
+            hr = BalBaseBAProcOnDetectUpdate(pBA, reinterpret_cast<BA_ONDETECTUPDATE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTUPDATE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTUPDATECOMPLETE:
+            hr = BalBaseBAProcOnDetectUpdateComplete(pBA, reinterpret_cast<BA_ONDETECTUPDATECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTUPDATECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDBUNDLE:
+            hr = BalBaseBAProcOnDetectRelatedBundle(pBA, reinterpret_cast<BA_ONDETECTRELATEDBUNDLE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTRELATEDBUNDLE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGEBEGIN:
+            hr = BalBaseBAProcOnDetectPackageBegin(pBA, reinterpret_cast<BA_ONDETECTPACKAGEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTPACKAGEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTRELATEDMSIPACKAGE:
+            hr = BalBaseBAProcOnDetectRelatedMsiPackage(pBA, reinterpret_cast<BA_ONDETECTRELATEDMSIPACKAGE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTRELATEDMSIPACKAGE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPATCHTARGET:
+            hr = BalBaseBAProcOnDetectPatchTarget(pBA, reinterpret_cast<BA_ONDETECTPATCHTARGET_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTPATCHTARGET_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTMSIFEATURE:
+            hr = BalBaseBAProcOnDetectMsiFeature(pBA, reinterpret_cast<BA_ONDETECTMSIFEATURE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTMSIFEATURE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONDETECTPACKAGECOMPLETE:
+            hr = BalBaseBAProcOnDetectPackageComplete(pBA, reinterpret_cast<BA_ONDETECTPACKAGECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONDETECTPACKAGECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANRELATEDBUNDLE:
+            hr = BalBaseBAProcOnPlanRelatedBundle(pBA, reinterpret_cast<BA_ONPLANRELATEDBUNDLE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANRELATEDBUNDLE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGEBEGIN:
+            hr = BalBaseBAProcOnPlanPackageBegin(pBA, reinterpret_cast<BA_ONPLANPACKAGEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANPACKAGEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPATCHTARGET:
+            hr = BalBaseBAProcOnPlanPatchTarget(pBA, reinterpret_cast<BA_ONPLANPATCHTARGET_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANPATCHTARGET_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIFEATURE:
+            hr = BalBaseBAProcOnPlanMsiFeature(pBA, reinterpret_cast<BA_ONPLANMSIFEATURE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANMSIFEATURE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANPACKAGECOMPLETE:
+            hr = BalBaseBAProcOnPlanPackageComplete(pBA, reinterpret_cast<BA_ONPLANPACKAGECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANPACKAGECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYBEGIN:
+            hr = BalBaseBAProcOnApplyBegin(pBA, reinterpret_cast<BA_ONAPPLYBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONAPPLYBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATEBEGIN:
+            hr = BalBaseBAProcOnElevateBegin(pBA, reinterpret_cast<BA_ONELEVATEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONELEVATEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONELEVATECOMPLETE:
+            hr = BalBaseBAProcOnElevateComplete(pBA, reinterpret_cast<BA_ONELEVATECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONELEVATECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPROGRESS:
+            hr = BalBaseBAProcOnProgress(pBA, reinterpret_cast<BA_ONPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONERROR:
+            hr = BalBaseBAProcOnError(pBA, reinterpret_cast<BA_ONERROR_ARGS*>(pvArgs), reinterpret_cast<BA_ONERROR_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERBEGIN:
+            hr = BalBaseBAProcOnRegisterBegin(pBA, reinterpret_cast<BA_ONREGISTERBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONREGISTERBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONREGISTERCOMPLETE:
+            hr = BalBaseBAProcOnRegisterComplete(pBA, reinterpret_cast<BA_ONREGISTERCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONREGISTERCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEBEGIN:
+            hr = BalBaseBAProcOnCacheBegin(pBA, reinterpret_cast<BA_ONCACHEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGEBEGIN:
+            hr = BalBaseBAProcOnCachePackageBegin(pBA, reinterpret_cast<BA_ONCACHEPACKAGEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEPACKAGEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREBEGIN:
+            hr = BalBaseBAProcOnCacheAcquireBegin(pBA, reinterpret_cast<BA_ONCACHEACQUIREBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEACQUIREBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIREPROGRESS:
+            hr = BalBaseBAProcOnCacheAcquireProgress(pBA, reinterpret_cast<BA_ONCACHEACQUIREPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEACQUIREPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRERESOLVING:
+            hr = BalBaseBAProcOnCacheAcquireResolving(pBA, reinterpret_cast<BA_ONCACHEACQUIRERESOLVING_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEACQUIRERESOLVING_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEACQUIRECOMPLETE:
+            hr = BalBaseBAProcOnCacheAcquireComplete(pBA, reinterpret_cast<BA_ONCACHEACQUIRECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEACQUIRECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYBEGIN:
+            hr = BalBaseBAProcOnCacheVerifyBegin(pBA, reinterpret_cast<BA_ONCACHEVERIFYBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEVERIFYBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYPROGRESS:
+            hr = BalBaseBAProcOnCacheVerifyProgress(pBA, reinterpret_cast<BA_ONCACHEVERIFYPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEVERIFYPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEVERIFYCOMPLETE:
+            hr = BalBaseBAProcOnCacheVerifyComplete(pBA, reinterpret_cast<BA_ONCACHEVERIFYCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEVERIFYCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPACKAGECOMPLETE:
+            hr = BalBaseBAProcOnCachePackageComplete(pBA, reinterpret_cast<BA_ONCACHEPACKAGECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEPACKAGECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECOMPLETE:
+            hr = BalBaseBAProcOnCacheComplete(pBA, reinterpret_cast<BA_ONCACHECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEBEGIN:
+            hr = BalBaseBAProcOnExecuteBegin(pBA, reinterpret_cast<BA_ONEXECUTEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGEBEGIN:
+            hr = BalBaseBAProcOnExecutePackageBegin(pBA, reinterpret_cast<BA_ONEXECUTEPACKAGEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEPACKAGEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPATCHTARGET:
+            hr = BalBaseBAProcOnExecutePatchTarget(pBA, reinterpret_cast<BA_ONEXECUTEPATCHTARGET_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEPATCHTARGET_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPROGRESS:
+            hr = BalBaseBAProcOnExecuteProgress(pBA, reinterpret_cast<BA_ONEXECUTEPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEMSIMESSAGE:
+            hr = BalBaseBAProcOnExecuteMsiMessage(pBA, reinterpret_cast<BA_ONEXECUTEMSIMESSAGE_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEMSIMESSAGE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEFILESINUSE:
+            hr = BalBaseBAProcOnExecuteFilesInUse(pBA, reinterpret_cast<BA_ONEXECUTEFILESINUSE_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEFILESINUSE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTEPACKAGECOMPLETE:
+            hr = BalBaseBAProcOnExecutePackageComplete(pBA, reinterpret_cast<BA_ONEXECUTEPACKAGECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTEPACKAGECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONEXECUTECOMPLETE:
+            hr = BalBaseBAProcOnExecuteComplete(pBA, reinterpret_cast<BA_ONEXECUTECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONEXECUTECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERBEGIN:
+            hr = BalBaseBAProcOnUnregisterBegin(pBA, reinterpret_cast<BA_ONUNREGISTERBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONUNREGISTERBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONUNREGISTERCOMPLETE:
+            hr = BalBaseBAProcOnUnregisterComplete(pBA, reinterpret_cast<BA_ONUNREGISTERCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONUNREGISTERCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONAPPLYCOMPLETE:
+            hr = BalBaseBAProcOnApplyComplete(pBA, reinterpret_cast<BA_ONAPPLYCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONAPPLYCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXEBEGIN:
+            hr = BalBaseBAProcOnLaunchApprovedExeBegin(pBA, reinterpret_cast<BA_ONLAUNCHAPPROVEDEXEBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONLAUNCHAPPROVEDEXEBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONLAUNCHAPPROVEDEXECOMPLETE:
+            hr = BalBaseBAProcOnLaunchApprovedExeComplete(pBA, reinterpret_cast<BA_ONLAUNCHAPPROVEDEXECOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONLAUNCHAPPROVEDEXECOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANMSIPACKAGE:
+            hr = BalBaseBAProcOnPlanMsiPackage(pBA, reinterpret_cast<BA_ONPLANMSIPACKAGE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANMSIPACKAGE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONBEGIN:
+            hr = BalBaseBAProcOnBeginMsiTransactionBegin(pBA, reinterpret_cast<BA_ONBEGINMSITRANSACTIONBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONBEGINMSITRANSACTIONBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONBEGINMSITRANSACTIONCOMPLETE:
+            hr = BalBaseBAProcOnBeginMsiTransactionComplete(pBA, reinterpret_cast<BA_ONBEGINMSITRANSACTIONCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONBEGINMSITRANSACTIONCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONBEGIN:
+            hr = BalBaseBAProcOnCommitMsiTransactionBegin(pBA, reinterpret_cast<BA_ONCOMMITMSITRANSACTIONBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCOMMITMSITRANSACTIONBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCOMMITMSITRANSACTIONCOMPLETE:
+            hr = BalBaseBAProcOnCommitMsiTransactionComplete(pBA, reinterpret_cast<BA_ONCOMMITMSITRANSACTIONCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCOMMITMSITRANSACTIONCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONBEGIN:
+            hr = BalBaseBAProcOnRollbackMsiTransactionBegin(pBA, reinterpret_cast<BA_ONROLLBACKMSITRANSACTIONBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONROLLBACKMSITRANSACTIONBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONROLLBACKMSITRANSACTIONCOMPLETE:
+            hr = BalBaseBAProcOnRollbackMsiTransactionComplete(pBA, reinterpret_cast<BA_ONROLLBACKMSITRANSACTIONCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONROLLBACKMSITRANSACTIONCOMPLETE_RESULTS*>(pvResults));
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESBEGIN:
+            hr = BalBaseBAProcOnPauseAutomaticUpdatesBegin(pBA, reinterpret_cast<BA_ONPAUSEAUTOMATICUPDATESBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONPAUSEAUTOMATICUPDATESBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPAUSEAUTOMATICUPDATESCOMPLETE:
+            hr = BalBaseBAProcOnPauseAutomaticUpdatesComplete(pBA, reinterpret_cast<BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPAUSEAUTOMATICUPDATESCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTBEGIN:
+            hr = BalBaseBAProcOnSystemRestorePointBegin(pBA, reinterpret_cast<BA_ONSYSTEMRESTOREPOINTBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONSYSTEMRESTOREPOINTBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONSYSTEMRESTOREPOINTCOMPLETE:
+            hr = BalBaseBAProcOnSystemRestorePointComplete(pBA, reinterpret_cast<BA_ONSYSTEMRESTOREPOINTCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONSYSTEMRESTOREPOINTCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANNEDPACKAGE:
+            hr = BalBaseBAProcOnPlannedPackage(pBA, reinterpret_cast<BA_ONPLANNEDPACKAGE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANNEDPACKAGE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONPLANFORWARDCOMPATIBLEBUNDLE:
+            hr = BalBaseBAProcOnPlanForwardCompatibleBundle(pBA, reinterpret_cast<BA_ONPLANFORWARDCOMPATIBLEBUNDLE_ARGS*>(pvArgs), reinterpret_cast<BA_ONPLANFORWARDCOMPATIBLEBUNDLE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYBEGIN:
+            hr = BalBaseBAProcOnCacheContainerOrPayloadVerifyBegin(pBA, reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS:
+            hr = BalBaseBAProcOnCacheContainerOrPayloadVerifyProgress(pBA, reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE:
+            hr = BalBaseBAProcOnCacheContainerOrPayloadVerifyComplete(pBA, reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHECONTAINERORPAYLOADVERIFYCOMPLETE_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTBEGIN:
+            hr = BalBaseBAProcOnCachePayloadExtractBegin(pBA, reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTBEGIN_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTBEGIN_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTPROGRESS:
+            hr = BalBaseBAProcOnCachePayloadExtractProgress(pBA, reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTPROGRESS_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTPROGRESS_RESULTS*>(pvResults));
+            break;
+        case BOOTSTRAPPER_APPLICATION_MESSAGE_ONCACHEPAYLOADEXTRACTCOMPLETE:
+            hr = BalBaseBAProcOnCachePayloadExtractComplete(pBA, reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTCOMPLETE_ARGS*>(pvArgs), reinterpret_cast<BA_ONCACHEPAYLOADEXTRACTCOMPLETE_RESULTS*>(pvResults));
+            break;
+        }
+    }
+    pBA->BAProcFallback(message, pvArgs, pvResults, &hr, pvContext);
+    return hr;
+}
diff --git a/src/api/burn/balutil/inc/BalBootstrapperEngine.h b/src/api/burn/balutil/inc/BalBootstrapperEngine.h
new file mode 100644
index 00000000..45131d98
--- /dev/null
+++ b/src/api/burn/balutil/inc/BalBootstrapperEngine.h
@@ -0,0 +1,17 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+// function declarations
+HRESULT BalBootstrapperEngineCreate(
+    __in PFN_BOOTSTRAPPER_ENGINE_PROC pfnBAEngineProc,
+    __in_opt LPVOID pvBAEngineProcContext,
+    __out IBootstrapperEngine** ppEngineForApplication
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/inc/IBAFunctions.h b/src/api/burn/balutil/inc/IBAFunctions.h
new file mode 100644
index 00000000..7d8a07fa
--- /dev/null
+++ b/src/api/burn/balutil/inc/IBAFunctions.h
@@ -0,0 +1,34 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+DECLARE_INTERFACE_IID_(IBAFunctions, IBootstrapperApplication, "0FB445ED-17BD-49C7-BE19-479776F8AE96")
+{
+    // OnThemeLoaded - Called after the BA finished loading all the controls for the theme.
+    //
+    STDMETHOD(OnThemeLoaded)(
+        THEME* pTheme,
+        WIX_LOCALIZATION* pWixLoc
+        ) = 0;
+    // WndProc - Called if the BA hasn't handled the message.
+    //           The implementation must either return E_NOTIMPL or call ThemeDefWindowProc for unhandled messages.
+    //
+    STDMETHOD(WndProc)(
+        __in THEME* pTheme,
+        __in HWND hWnd,
+        __in UINT uMsg,
+        __in WPARAM wParam,
+        __in LPARAM lParam,
+        __inout LRESULT* plRes
+        ) = 0;
+    // BAFunctionsProc - The PFN_BA_FUNCTIONS_PROC can call this method to give the BAFunctions raw access to the callback from WixStdBA.
+    //                   This might be used to help the BAFunctions support more than one version of the engine/WixStdBA.
+    STDMETHOD(BAFunctionsProc)(
+        __in BA_FUNCTIONS_MESSAGE message,
+        __in const LPVOID pvArgs,
+        __inout LPVOID pvResults,
+        __in_opt LPVOID pvContext
+        ) = 0;
+};
diff --git a/src/api/burn/balutil/inc/IBootstrapperApplication.h b/src/api/burn/balutil/inc/IBootstrapperApplication.h
new file mode 100644
index 00000000..c284cb49
--- /dev/null
+++ b/src/api/burn/balutil/inc/IBootstrapperApplication.h
@@ -0,0 +1,649 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-AB06-099D717C67FE")
+{
+    // BAProc - The PFN_BOOTSTRAPPER_APPLICATION_PROC can call this method to give the BA raw access to the callback from the engine.
+    //          This might be used to help the BA support more than one version of the engine.
+    STDMETHOD(BAProc)(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE message,
+        __in const LPVOID pvArgs,
+        __inout LPVOID pvResults,
+        __in_opt LPVOID pvContext
+        ) = 0;
+    // BAProcFallback - The PFN_BOOTSTRAPPER_APPLICATION_PROC can call this method
+    //                  to give the BA the ability to use default behavior
+    //                  and then forward the message to extensions.
+    STDMETHOD_(void, BAProcFallback)(
+        __in BOOTSTRAPPER_APPLICATION_MESSAGE message,
+        __in const LPVOID pvArgs,
+        __inout LPVOID pvResults,
+        __inout HRESULT* phr,
+        __in_opt LPVOID pvContext
+        ) = 0;
+    // OnStartup - called when the engine is ready for the bootstrapper application to start.
+    //
+    STDMETHOD(OnStartup)() = 0;
+    // OnShutdown - called after the bootstrapper application quits the engine.
+    STDMETHOD(OnShutdown)(
+        __inout BOOTSTRAPPER_SHUTDOWN_ACTION* pAction
+        ) = 0;
+    // OnSystemShutdown - called when the operating system is instructed to shutdown the machine.
+    STDMETHOD(OnSystemShutdown)(
+        __in DWORD dwEndSession,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectBegin - called when the engine begins detection.
+    STDMETHOD(OnDetectBegin)(
+        __in BOOL fCached,
+        __in BOOL fInstalled,
+        __in DWORD cPackages,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectForwardCompatibleBundle - called when the engine detects a forward compatible bundle.
+    STDMETHOD(OnDetectForwardCompatibleBundle)(
+        __in_z LPCWSTR wzBundleId,
+        __in BOOTSTRAPPER_RELATION_TYPE relationType,
+        __in_z LPCWSTR wzBundleTag,
+        __in BOOL fPerMachine,
+        __in_z LPCWSTR wzVersion,
+        __in BOOL fMissingFromCache,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectUpdateBegin - called when the engine begins detection for bundle update.
+    STDMETHOD(OnDetectUpdateBegin)(
+        __in_z LPCWSTR wzUpdateLocation,
+        __inout BOOL* pfCancel,
+        __inout BOOL* pfSkip
+        ) = 0;
+    // OnDetectUpdate - called when the engine has an update candidate for bundle update.
+    STDMETHOD(OnDetectUpdate)(
+        __in_z_opt LPCWSTR wzUpdateLocation,
+        __in DWORD64 dw64Size,
+        __in_z LPCWSTR wzVersion,
+        __in_z_opt LPCWSTR wzTitle,
+        __in_z_opt LPCWSTR wzSummary,
+        __in_z_opt LPCWSTR wzContentType,
+        __in_z_opt LPCWSTR wzContent,
+        __inout BOOL* pfCancel,
+        __inout BOOL* pfStopProcessingUpdates
+        ) = 0;
+    // OnDetectUpdateComplete - called when the engine completes detection for bundle update.
+    STDMETHOD(OnDetectUpdateComplete)(
+        __in HRESULT hrStatus,
+        __inout BOOL* pfIgnoreError
+        ) = 0;
+    // OnDetectRelatedBundle - called when the engine detects a related bundle.
+    STDMETHOD(OnDetectRelatedBundle)(
+        __in_z LPCWSTR wzBundleId,
+        __in BOOTSTRAPPER_RELATION_TYPE relationType,
+        __in_z LPCWSTR wzBundleTag,
+        __in BOOL fPerMachine,
+        __in_z LPCWSTR wzVersion,
+        __in BOOTSTRAPPER_RELATED_OPERATION operation,
+        __in BOOL fMissingFromCache,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectPackageBegin - called when the engine begins detecting a package.
+    STDMETHOD(OnDetectPackageBegin)(
+        __in_z LPCWSTR wzPackageId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectRelatedMsiPackage - called when the engine begins detects a related package.
+    STDMETHOD(OnDetectRelatedMsiPackage)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzUpgradeCode,
+        __in_z LPCWSTR wzProductCode,
+        __in BOOL fPerMachine,
+        __in_z LPCWSTR wzVersion,
+        __in BOOTSTRAPPER_RELATED_OPERATION operation,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectPatchTarget - called when the engine detects a target product
+    //                       for an MSP package.
+    STDMETHOD(OnDetectPatchTarget)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzProductCode,
+        __in BOOTSTRAPPER_PACKAGE_STATE patchState,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectMsiFeature - called when the engine detects a feature in an MSI package.
+    STDMETHOD(OnDetectMsiFeature)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzFeatureId,
+        __in BOOTSTRAPPER_FEATURE_STATE state,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnDetectPackageComplete - called after the engine detects a package.
+    //
+    STDMETHOD(OnDetectPackageComplete)(
+        __in_z LPCWSTR wzPackageId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_PACKAGE_STATE state,
+        __in BOOL fCached
+        ) = 0;
+    // OnDetectPackageComplete - called after the engine completes detection.
+    //
+    STDMETHOD(OnDetectComplete)(
+        __in HRESULT hrStatus,
+        __in BOOL fEligibleForCleanup
+        ) = 0;
+    // OnPlanBegin - called when the engine begins planning.
+    STDMETHOD(OnPlanBegin)(
+        __in DWORD cPackages,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnPlanRelatedBundle - called when the engine begins planning a related bundle.
+    STDMETHOD(OnPlanRelatedBundle)(
+        __in_z LPCWSTR wzBundleId,
+        __in BOOTSTRAPPER_REQUEST_STATE recommendedState,
+        __inout BOOTSTRAPPER_REQUEST_STATE* pRequestedState,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnPlanPackageBegin - called when the engine has begun getting the BA's input
+    //                      for planning a package.
+    STDMETHOD(OnPlanPackageBegin)(
+        __in_z LPCWSTR wzPackageId,
+        __in BOOTSTRAPPER_PACKAGE_STATE state,
+        __in BOOL fCached,
+        __in BOOTSTRAPPER_PACKAGE_CONDITION_RESULT installCondition,
+        __in BOOTSTRAPPER_REQUEST_STATE recommendedState,
+        __in BOOTSTRAPPER_CACHE_TYPE recommendedCacheType,
+        __inout BOOTSTRAPPER_REQUEST_STATE* pRequestedState,
+        __inout BOOTSTRAPPER_CACHE_TYPE* pRequestedCacheType,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnPlanPatchTarget - called when the engine is about to plan a target
+    //                     of an MSP package.
+    STDMETHOD(OnPlanPatchTarget)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzProductCode,
+        __in BOOTSTRAPPER_REQUEST_STATE recommendedState,
+        __inout BOOTSTRAPPER_REQUEST_STATE* pRequestedState,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnPlanMsiFeature - called when the engine plans a feature in an
+    //                    MSI package.
+    STDMETHOD(OnPlanMsiFeature)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzFeatureId,
+        __in BOOTSTRAPPER_FEATURE_STATE recommendedState,
+        __inout BOOTSTRAPPER_FEATURE_STATE* pRequestedState,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnPlanMsiPackage - called when the engine plans an MSI or MSP package.
+    //
+    STDMETHOD(OnPlanMsiPackage)(
+        __in_z LPCWSTR wzPackageId,
+        __in BOOL fExecute, // false means rollback.
+        __in BOOTSTRAPPER_ACTION_STATE action,
+        __inout BOOL* pfCancel,
+        __inout BURN_MSI_PROPERTY* pActionMsiProperty,
+        __inout INSTALLUILEVEL* pUiLevel,
+        __inout BOOL* pfDisableExternalUiHandler
+        ) = 0;
+    // OnPlanPackageComplete - called after the engine has completed getting the BA's input
+    //                         for planning a package.
+    STDMETHOD(OnPlanPackageComplete)(
+        __in_z LPCWSTR wzPackageId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_REQUEST_STATE requested
+        ) = 0;
+    // OnPlannedPackage - called after the engine has completed planning a package.
+    STDMETHOD(OnPlannedPackage)(
+        __in_z LPCWSTR wzPackageId,
+        __in BOOTSTRAPPER_ACTION_STATE execute,
+        __in BOOTSTRAPPER_ACTION_STATE rollback,
+        __in BOOL fPlannedCache,
+        __in BOOL fPlannedUncache
+        ) = 0;
+    // OnPlanComplete - called when the engine completes planning.
+    //
+    STDMETHOD(OnPlanComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnApplyBegin - called when the engine begins applying the plan.
+    //
+    STDMETHOD(OnApplyBegin)(
+        __in DWORD dwPhaseCount,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnElevateBegin - called before the engine displays an elevation prompt.
+    //                  Will only happen once per execution of the engine,
+    //                  assuming the elevation was successful.
+    STDMETHOD(OnElevateBegin)(
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnElevateComplete - called after the engine attempted to elevate.
+    //
+    STDMETHOD(OnElevateComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnProgress - called when the engine makes progress.
+    //
+    STDMETHOD(OnProgress)(
+        __in DWORD dwProgressPercentage,
+        __in DWORD dwOverallPercentage,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnError - called when the engine encounters an error.
+    //
+    // nResult:
+    //  uiFlags is a combination of valid ID* return values appropriate for
+    //          the error.
+    //
+    //  IDNOACTION instructs the engine to pass the error through to default
+    //             handling which usually results in the apply failing.
+    STDMETHOD(OnError)(
+        __in BOOTSTRAPPER_ERROR_TYPE errorType,
+        __in_z_opt LPCWSTR wzPackageId,
+        __in DWORD dwCode,
+        __in_z_opt LPCWSTR wzError,
+        __in DWORD dwUIHint,
+        __in DWORD cData,
+        __in_ecount_z_opt(cData) LPCWSTR* rgwzData,
+        __in int nRecommendation,
+        __inout int* pResult
+        ) = 0;
+    // OnRegisterBegin - called when the engine registers the bundle.
+    //
+    STDMETHOD(OnRegisterBegin)(
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnRegisterComplete - called when the engine registration is
+    //                      complete.
+    //
+    STDMETHOD(OnRegisterComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnCacheBegin - called when the engine begins caching.
+    //
+    STDMETHOD(OnCacheBegin)(
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnCachePackageBegin - called when the engine begins caching
+    //                       a package.
+    //
+    STDMETHOD(OnCachePackageBegin)(
+        __in_z LPCWSTR wzPackageId,
+        __in DWORD cCachePayloads,
+        __in DWORD64 dw64PackageCacheSize,
+        __inout BOOL* pfCancel
+        )  = 0;
+    // OnCacheAcquireBegin - called when the engine begins acquiring a payload or container.
+    //
+    // Notes:
+    //  It is expected the BA may call IBootstrapperEngine::SetLocalSource() or IBootstrapperEngine::SetDownloadSource()
+    //  to update the source location before returning.
+    //
+    STDMETHOD(OnCacheAcquireBegin)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR wzSource,
+        __in_z_opt LPCWSTR wzDownloadUrl,
+        __in_z_opt LPCWSTR wzPayloadContainerId,
+        __in BOOTSTRAPPER_CACHE_OPERATION recommendation,
+        __inout BOOTSTRAPPER_CACHE_OPERATION* pAction,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnCacheAcquireProgress - called when the engine makes progress acquiring the payload or container.
+    //
+    STDMETHOD(OnCacheAcquireProgress)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in DWORD64 dw64Progress,
+        __in DWORD64 dw64Total,
+        __in DWORD dwOverallPercentage,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnCacheAcquireResolving - called to allow the BA to override the acquisition action for the payload or container.
+    //
+    // Parameters:
+    //  wzPackageOrContainerId will be NULL when resolving a layout-only payload.
+    //  wzPayloadId will be NULL when resolving a container.
+    //  wzDownloadUrl will be NULL if the container or payload does not provide a DownloadURL.
+    //  wzPayloadContainerId will not be NULL if acquiring a payload that is in a container.
+    //
+    //  rgSearchPaths are the search paths used for source resolution.
+    //  fFoundLocal is TRUE when dwRecommendedSearchPath indicates that the file was found.
+    //  dwRecommendedSearchPath is the index into rgSearchPaths for the recommended local file.
+    //
+    STDMETHOD(OnCacheAcquireResolving)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR* rgSearchPaths,
+        __in DWORD cSearchPaths,
+        __in BOOL fFoundLocal,
+        __in DWORD dwRecommendedSearchPath,
+        __in_z_opt LPCWSTR wzDownloadUrl,
+        __in_z_opt LPCWSTR wzPayloadContainerId,
+        __in BOOTSTRAPPER_CACHE_RESOLVE_OPERATION recommendation,
+        __inout DWORD* pdwChosenSearchPath,
+        __inout BOOTSTRAPPER_CACHE_RESOLVE_OPERATION* pAction,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnCacheAcquireComplete - called after the engine acquired the payload or container.
+    //
+    // Notes:
+    //  It is expected the BA may call IBootstrapperEngine::SetLocalSource() or IBootstrapperEngine::SetDownloadSource()
+    //  to update the source location before returning BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION_RETRY.
+    //
+    STDMETHOD(OnCacheAcquireComplete)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION recommendation,
+        __inout BOOTSTRAPPER_CACHEACQUIRECOMPLETE_ACTION* pAction
+        ) = 0;
+    // OnCacheVerifyBegin - called when the engine begins to verify then copy
+    //                      a payload or container to the package cache folder.
+    //
+    STDMETHOD(OnCacheVerifyBegin)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCacheVerifyProgress)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in DWORD64 dw64Progress,
+        __in DWORD64 dw64Total,
+        __in DWORD dwOverallPercentage,
+        __in BOOTSTRAPPER_CACHE_VERIFY_STEP verifyStep,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnCacheVerifyComplete - called after the engine verifies and copies
+    //                         a payload or container to the package cache folder.
+    //
+    STDMETHOD(OnCacheVerifyComplete)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION recommendation,
+        __inout BOOTSTRAPPER_CACHEVERIFYCOMPLETE_ACTION* pAction
+        ) = 0;
+    // OnCachePackageComplete - called after the engine attempts to copy or download all
+    //                          payloads of a package into the package cache folder.
+    //
+    STDMETHOD(OnCachePackageComplete)(
+        __in_z LPCWSTR wzPackageId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION recommendation,
+        __inout BOOTSTRAPPER_CACHEPACKAGECOMPLETE_ACTION* pAction
+        )  = 0;
+    // OnCacheComplete - called when the engine caching is complete.
+    //
+    STDMETHOD(OnCacheComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnExecuteBegin - called when the engine begins executing the plan.
+    //
+    STDMETHOD(OnExecuteBegin)(
+        __in DWORD cExecutingPackages,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnExecutePackageBegin - called when the engine begins executing a package.
+    //
+    STDMETHOD(OnExecutePackageBegin)(
+        __in_z LPCWSTR wzPackageId,
+        __in BOOL fExecute, // false means rollback.
+        __in BOOTSTRAPPER_ACTION_STATE action,
+        __in INSTALLUILEVEL uiLevel,
+        __in BOOL fDisableExternalUiHandler,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnExecutePatchTarget - called for each patch in an MspPackage targeting the product
+    //                        when the engine begins executing the MspPackage.
+    //
+    STDMETHOD(OnExecutePatchTarget)(
+        __in_z LPCWSTR wzPackageId,
+        __in_z LPCWSTR wzTargetProductCode,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnExecuteProgress - called when the engine makes progress executing a package.
+    //
+    STDMETHOD(OnExecuteProgress)(
+        __in_z LPCWSTR wzPackageId,
+        __in DWORD dwProgressPercentage,
+        __in DWORD dwOverallPercentage,
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnExecuteMsiMessage - called when the engine receives an MSI package message.
+    //
+    // Return:
+    //  uiFlags is a combination of valid ID* return values appropriate for
+    //          the message.
+    //
+    //  IDNOACTION instructs the engine to pass the message through to default
+    //             handling which usually results in the execution continuing.
+    STDMETHOD(OnExecuteMsiMessage)(
+        __in_z LPCWSTR wzPackageId,
+        __in INSTALLMESSAGE messageType,
+        __in DWORD dwUIHint,
+        __in_z LPCWSTR wzMessage,
+        __in DWORD cData,
+        __in_ecount_z_opt(cData) LPCWSTR* rgwzData,
+        __in int nRecommendation,
+        __inout int* pResult
+        ) = 0;
+    // OnExecuteFilesInUse - called when the engine encounters files in use while
+    //                       executing a package.
+    //
+    // Return:
+    //  IDOK instructs the engine to let the Restart Manager attempt to close the
+    //       applications to avoid a restart.
+    //
+    //  IDCANCEL instructs the engine to abort the execution and start rollback.
+    //
+    //  IDIGNORE instructs the engine to ignore the running applications. A restart will be
+    //           required.
+    //
+    //  IDRETRY instructs the engine to check if the applications are still running again.
+    //
+    //  IDNOACTION is equivalent to ignoring the running applications. A restart will be
+    //             required.
+    STDMETHOD(OnExecuteFilesInUse)(
+        __in_z LPCWSTR wzPackageId,
+        __in DWORD cFiles,
+        __in_ecount_z(cFiles) LPCWSTR* rgwzFiles,
+        __in int nRecommendation,
+        __inout int* pResult
+        ) = 0;
+    // OnExecutePackageComplete - called when a package execution is complete.
+    //
+    STDMETHOD(OnExecutePackageComplete)(
+        __in_z LPCWSTR wzPackageId,
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_APPLY_RESTART restart,
+        __in BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION recommendation,
+        __inout BOOTSTRAPPER_EXECUTEPACKAGECOMPLETE_ACTION* pAction
+        ) = 0;
+    // OnExecuteComplete - called when the engine execution is complete.
+    //
+    STDMETHOD(OnExecuteComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnUnregisterBegin - called when the engine unregisters the bundle.
+    //
+    STDMETHOD(OnUnregisterBegin)(
+        __in BOOL fKeepRegistration,
+        __inout BOOL* pfForceKeepRegistration
+        ) = 0;
+    // OnUnregisterComplete - called when the engine unregistration is complete.
+    //
+    STDMETHOD(OnUnregisterComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    // OnApplyComplete - called after the plan has been applied.
+    //
+    STDMETHOD(OnApplyComplete)(
+        __in HRESULT hrStatus,
+        __in BOOTSTRAPPER_APPLY_RESTART restart,
+        __in BOOTSTRAPPER_APPLYCOMPLETE_ACTION recommendation,
+        __inout BOOTSTRAPPER_APPLYCOMPLETE_ACTION* pAction
+        ) = 0;
+    // OnLaunchApprovedExeBegin - called before trying to launch the preapproved executable.
+    // 
+    STDMETHOD(OnLaunchApprovedExeBegin)(
+        __inout BOOL* pfCancel
+        ) = 0;
+    // OnLaunchApprovedExeComplete - called after trying to launch the preapproved executable.
+    //
+    STDMETHOD(OnLaunchApprovedExeComplete)(
+        __in HRESULT hrStatus,
+        __in DWORD dwProcessId
+        ) = 0;
+    STDMETHOD(OnBeginMsiTransactionBegin)(
+        __in_z LPCWSTR wzTransactionId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnBeginMsiTransactionComplete)(
+        __in_z LPCWSTR wzTransactionId,
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnCommitMsiTransactionBegin)(
+        __in_z LPCWSTR wzTransactionId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCommitMsiTransactionComplete)(
+        __in_z LPCWSTR wzTransactionId,
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnRollbackMsiTransactionBegin)(
+        __in_z LPCWSTR wzTransactionId
+        ) = 0;
+    STDMETHOD(OnRollbackMsiTransactionComplete)(
+        __in_z LPCWSTR wzTransactionId,
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnPauseAutomaticUpdatesBegin)(
+        ) = 0;
+    STDMETHOD(OnPauseAutomaticUpdatesComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnSystemRestorePointBegin)(
+        ) = 0;
+    STDMETHOD(OnSystemRestorePointComplete)(
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnPlanForwardCompatibleBundle)(
+        __in_z LPCWSTR wzBundleId,
+        __in BOOTSTRAPPER_RELATION_TYPE relationType,
+        __in_z LPCWSTR wzBundleTag,
+        __in BOOL fPerMachine,
+        __in_z LPCWSTR wzVersion,
+        __in BOOL fRecommendedIgnoreBundle,
+        __inout BOOL* pfCancel,
+        __inout BOOL* pfIgnoreBundle
+        ) = 0;
+    STDMETHOD(OnCacheContainerOrPayloadVerifyBegin)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCacheContainerOrPayloadVerifyProgress)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in DWORD64 dw64Progress,
+        __in DWORD64 dw64Total,
+        __in DWORD dwOverallPercentage,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCacheContainerOrPayloadVerifyComplete)(
+        __in_z_opt LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in HRESULT hrStatus
+        ) = 0;
+    STDMETHOD(OnCachePayloadExtractBegin)(
+        __in_z_opt LPCWSTR wzContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCachePayloadExtractProgress)(
+        __in_z_opt LPCWSTR wzContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in DWORD64 dw64Progress,
+        __in DWORD64 dw64Total,
+        __in DWORD dwOverallPercentage,
+        __inout BOOL* pfCancel
+        ) = 0;
+    STDMETHOD(OnCachePayloadExtractComplete)(
+        __in_z_opt LPCWSTR wzContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in HRESULT hrStatus
+        ) = 0;
+};
diff --git a/src/api/burn/balutil/inc/IBootstrapperApplicationFactory.h b/src/api/burn/balutil/inc/IBootstrapperApplicationFactory.h
new file mode 100644
index 00000000..fd603e50
--- /dev/null
+++ b/src/api/burn/balutil/inc/IBootstrapperApplicationFactory.h
@@ -0,0 +1,13 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+DECLARE_INTERFACE_IID_(IBootstrapperApplicationFactory, IUnknown, "2965A12F-AC7B-43A0-85DF-E4B2168478A4")
+{
+    STDMETHOD(Create)(
+        __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+        __inout BOOTSTRAPPER_CREATE_RESULTS *pResults
+        );
+};
diff --git a/src/api/burn/balutil/inc/IBootstrapperEngine.h b/src/api/burn/balutil/inc/IBootstrapperEngine.h
new file mode 100644
index 00000000..ccb07f4f
--- /dev/null
+++ b/src/api/burn/balutil/inc/IBootstrapperEngine.h
@@ -0,0 +1,140 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+DECLARE_INTERFACE_IID_(IBootstrapperEngine, IUnknown, "6480D616-27A0-44D7-905B-81512C29C2FB")
+{
+    STDMETHOD(GetPackageCount)(
+        __out DWORD* pcPackages
+        ) = 0;
+    STDMETHOD(GetVariableNumeric)(
+        __in_z LPCWSTR wzVariable,
+        __out LONGLONG* pllValue
+        ) = 0;
+    STDMETHOD(GetVariableString)(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        ) = 0;
+    STDMETHOD(GetVariableVersion)(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T * pcchValue
+        ) = 0;
+    STDMETHOD(FormatString)(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T * pcchOut
+        ) = 0;
+    STDMETHOD(EscapeString)(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T * pcchOut
+        ) = 0;
+    STDMETHOD(EvaluateCondition)(
+        __in_z LPCWSTR wzCondition,
+        __out BOOL* pf
+        ) = 0;
+    STDMETHOD(Log)(
+        __in BOOTSTRAPPER_LOG_LEVEL level,
+        __in_z LPCWSTR wzMessage
+        ) = 0;
+    STDMETHOD(SendEmbeddedError)(
+        __in DWORD dwErrorCode,
+        __in_z_opt LPCWSTR wzMessage,
+        __in DWORD dwUIHint,
+        __out int* pnResult
+        ) = 0;
+    STDMETHOD(SendEmbeddedProgress)(
+        __in DWORD dwProgressPercentage,
+        __in DWORD dwOverallProgressPercentage,
+        __out int* pnResult
+        ) = 0;
+    STDMETHOD(SetUpdate)(
+        __in_z_opt LPCWSTR wzLocalSource,
+        __in_z_opt LPCWSTR wzDownloadSource,
+        __in DWORD64 qwSize,
+        __in BOOTSTRAPPER_UPDATE_HASH_TYPE hashType,
+        __in_bcount_opt(cbHash) BYTE* rgbHash,
+        __in DWORD cbHash
+        ) = 0;
+    STDMETHOD(SetLocalSource)(
+        __in_z LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR wzPath
+        ) = 0;
+    STDMETHOD(SetDownloadSource)(
+        __in_z LPCWSTR wzPackageOrContainerId,
+        __in_z_opt LPCWSTR wzPayloadId,
+        __in_z LPCWSTR wzUrl,
+        __in_z_opt LPCWSTR wzUser,
+        __in_z_opt LPCWSTR wzPassword
+        ) = 0;
+    STDMETHOD(SetVariableNumeric)(
+        __in_z LPCWSTR wzVariable,
+        __in LONGLONG llValue
+        ) = 0;
+    STDMETHOD(SetVariableString)(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue,
+        __in BOOL fFormatted
+        ) = 0;
+    STDMETHOD(SetVariableVersion)(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue
+        ) = 0;
+    STDMETHOD(CloseSplashScreen)() = 0;
+    STDMETHOD(Detect)(
+        __in_opt HWND hwndParent = NULL
+        ) = 0;
+    STDMETHOD(Plan)(
+        __in BOOTSTRAPPER_ACTION action
+        ) = 0;
+    STDMETHOD(Elevate)(
+        __in_opt HWND hwndParent
+        ) = 0;
+    STDMETHOD(Apply)(
+        __in HWND hwndParent
+        ) = 0;
+    STDMETHOD(Quit)(
+        __in DWORD dwExitCode
+        ) = 0;
+    STDMETHOD(LaunchApprovedExe)(
+        __in_opt HWND hwndParent,
+        __in_z LPCWSTR wzApprovedExeForElevationId,
+        __in_z_opt LPCWSTR wzArguments,
+        __in DWORD dwWaitForInputIdleTimeout
+        ) = 0;
+    STDMETHOD(SetUpdateSource)(
+        __in_z LPCWSTR wzUrl
+        ) = 0;
+    STDMETHOD(CompareVersions)(
+        __in_z LPCWSTR wzVersion1,
+        __in_z LPCWSTR wzVersion2,
+        __out int* pnResult
+        ) = 0;
+};
diff --git a/src/api/burn/balutil/inc/balcondition.h b/src/api/burn/balutil/inc/balcondition.h
new file mode 100644
index 00000000..677c593f
--- /dev/null
+++ b/src/api/burn/balutil/inc/balcondition.h
@@ -0,0 +1,58 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+typedef struct _BAL_CONDITION
+{
+    LPWSTR sczCondition;
+    LPWSTR sczMessage;
+} BAL_CONDITION;
+typedef struct _BAL_CONDITIONS
+{
+    BAL_CONDITION* rgConditions;
+    DWORD cConditions;
+} BAL_CONDITIONS;
+/*******************************************************************
+ BalConditionsParseFromXml - loads the conditions from the UX manifest.
+********************************************************************/
+DAPI_(HRESULT) BalConditionsParseFromXml(
+    __in BAL_CONDITIONS* pConditions,
+    __in IXMLDOMDocument* pixdManifest,
+    __in_opt WIX_LOCALIZATION* pWixLoc
+    );
+/*******************************************************************
+ BalConditionEvaluate - evaluates condition against the provided IBurnCore.
+ NOTE: psczMessage is optional.
+********************************************************************/
+DAPI_(HRESULT) BalConditionEvaluate(
+    __in BAL_CONDITION* pCondition,
+    __in IBootstrapperEngine* pEngine,
+    __out BOOL* pfResult,
+    __out_z_opt LPWSTR* psczMessage
+    );
+/*******************************************************************
+ BalConditionsUninitialize - uninitializes any conditions previously loaded.
+********************************************************************/
+DAPI_(void) BalConditionsUninitialize(
+    __in BAL_CONDITIONS* pConditions
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/inc/balinfo.h b/src/api/burn/balutil/inc/balinfo.h
new file mode 100644
index 00000000..8c2155e9
--- /dev/null
+++ b/src/api/burn/balutil/inc/balinfo.h
@@ -0,0 +1,105 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+typedef enum BAL_INFO_PACKAGE_TYPE
+{
+    BAL_INFO_PACKAGE_TYPE_UNKNOWN,
+    BAL_INFO_PACKAGE_TYPE_EXE,
+    BAL_INFO_PACKAGE_TYPE_MSI,
+    BAL_INFO_PACKAGE_TYPE_MSP,
+    BAL_INFO_PACKAGE_TYPE_MSU,
+    BAL_INFO_PACKAGE_TYPE_BUNDLE_UPGRADE,
+    BAL_INFO_PACKAGE_TYPE_BUNDLE_ADDON,
+    BAL_INFO_PACKAGE_TYPE_BUNDLE_PATCH,
+} BAL_INFO_PACKAGE_TYPE;
+typedef struct _BAL_INFO_PACKAGE
+{
+    LPWSTR sczId;
+    LPWSTR sczDisplayName;
+    LPWSTR sczDescription;
+    BAL_INFO_PACKAGE_TYPE type;
+    BOOL fPermanent;
+    BOOL fVital;
+    LPWSTR sczDisplayInternalUICondition;
+    LPWSTR sczProductCode;
+    LPWSTR sczUpgradeCode;
+    LPWSTR sczVersion;
+    LPWSTR sczInstallCondition;
+    BOOTSTRAPPER_CACHE_TYPE cacheType;
+    BOOL fPrereqPackage;
+    LPWSTR sczPrereqLicenseFile;
+    LPWSTR sczPrereqLicenseUrl;
+    LPVOID pvCustomData;
+} BAL_INFO_PACKAGE;
+typedef struct _BAL_INFO_PACKAGES
+{
+    BAL_INFO_PACKAGE* rgPackages;
+    DWORD cPackages;
+} BAL_INFO_PACKAGES;
+typedef struct _BAL_INFO_BUNDLE
+{
+    BOOL fPerMachine;
+    LPWSTR sczName;
+    LPWSTR sczLogVariable;
+    BAL_INFO_PACKAGES packages;
+} BAL_INFO_BUNDLE;
+/*******************************************************************
+ BalInfoParseFromXml - loads the bundle and package info from the UX
+                       manifest.
+********************************************************************/
+DAPI_(HRESULT) BalInfoParseFromXml(
+    __in BAL_INFO_BUNDLE* pBundle,
+    __in IXMLDOMDocument* pixdManifest
+    );
+/*******************************************************************
+ BalInfoAddRelatedBundleAsPackage - adds a related bundle as a package.
+ ********************************************************************/
+DAPI_(HRESULT) BalInfoAddRelatedBundleAsPackage(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in LPCWSTR wzId,
+    __in BOOTSTRAPPER_RELATION_TYPE relationType,
+    __in BOOL fPerMachine,
+    __out_opt BAL_INFO_PACKAGE** ppPackage
+    );
+/*******************************************************************
+ BalInfoFindPackageById - finds a package by its id.
+ ********************************************************************/
+DAPI_(HRESULT) BalInfoFindPackageById(
+    __in BAL_INFO_PACKAGES* pPackages,
+    __in LPCWSTR wzId,
+    __out BAL_INFO_PACKAGE** ppPackage
+    );
+/*******************************************************************
+ BalInfoUninitialize - uninitializes any info previously loaded.
+********************************************************************/
+DAPI_(void) BalInfoUninitialize(
+    __in BAL_INFO_BUNDLE* pBundle
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/inc/balretry.h b/src/api/burn/balutil/inc/balretry.h
new file mode 100644
index 00000000..35282a7e
--- /dev/null
+++ b/src/api/burn/balutil/inc/balretry.h
@@ -0,0 +1,74 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+/*******************************************************************
+ BalRetryInitialize - initialize the retry count and timeout between
+                      retries (in milliseconds).
+********************************************************************/
+DAPI_(void) BalRetryInitialize(
+    __in DWORD dwMaxRetries,
+    __in DWORD dwTimeout
+    );
+/*******************************************************************
+ BalRetryUninitialize - call to cleanup any memory allocated during
+                        use of the retry utility.
+********************************************************************/
+DAPI_(void) BalRetryUninitialize();
+/*******************************************************************
+ BalRetryStartPackage - call when a package begins to be modified. If
+                        the package is being retried, the function will
+                        wait the specified timeout.
+********************************************************************/
+DAPI_(void) BalRetryStartPackage(
+    __in_z LPCWSTR wzPackageId
+    );
+/*******************************************************************
+ BalRetryErrorOccured - call when an error occurs for the retry utility
+                        to consider.
+********************************************************************/
+DAPI_(void) BalRetryErrorOccurred(
+    __in_z LPCWSTR wzPackageId,
+    __in DWORD dwError
+    );
+/*******************************************************************
+ BalRetryEndPackage - returns TRUE if a retry is recommended.
+********************************************************************/
+DAPI_(HRESULT) BalRetryEndPackage(
+    __in_z LPCWSTR wzPackageId,
+    __in HRESULT hrError,
+    __inout BOOL* pfRetry
+    );
+/*******************************************************************
+ BalRetryStartContainerOrPayload - call when a container or payload
+        begins to be acquired. If the target is being retried,
+        the function will wait the specified timeout.
+********************************************************************/
+DAPI_(void) BalRetryStartContainerOrPayload(
+    __in_z_opt LPCWSTR wzContainerOrPackageId,
+    __in_z_opt LPCWSTR wzPayloadId
+    );
+/*******************************************************************
+ BalRetryEndContainerOrPayload - returns TRUE if a retry is recommended.
+********************************************************************/
+DAPI_(HRESULT) BalRetryEndContainerOrPayload(
+    __in_z_opt LPCWSTR wzContainerOrPackageId,
+    __in_z_opt LPCWSTR wzPayloadId,
+    __in HRESULT hrError,
+    __inout BOOL* pfRetry
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/inc/balutil.h b/src/api/burn/balutil/inc/balutil.h
new file mode 100644
index 00000000..fad8a471
--- /dev/null
+++ b/src/api/burn/balutil/inc/balutil.h
@@ -0,0 +1,199 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "dutil.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+#define BalExitOnFailureSource(d, x, f, ...) if (FAILED(x)) { BalLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BalExitOnRootFailureSource(d, x, f, ...) if (FAILED(x)) { BalLogError(x, f, __VA_ARGS__); Dutil_RootFailure(__FILE__, __LINE__, x); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BalExitOnLastErrorSource(d, x, f, ...) { x = ::GetLastError(); x = HRESULT_FROM_WIN32(x); if (FAILED(x)) { BalLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; } }
+#define BalExitOnNullSource(d, p, x, e, f, ...) if (NULL == p) { x = e; BalLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BalExitOnNullWithLastErrorSource(d, p, x, f, ...) if (NULL == p) { DWORD Dutil_er = ::GetLastError(); x = HRESULT_FROM_WIN32(Dutil_er); if (!FAILED(x)) { x = E_FAIL; } BalLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BalExitWithLastErrorSource(d, x, f, ...) { DWORD Dutil_er = ::GetLastError(); x = HRESULT_FROM_WIN32(Dutil_er); if (!FAILED(x)) { x = E_FAIL; } BalLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BalExitOnFailure(x, f, ...) BalExitOnFailureSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BalExitOnRootFailure(x, f, ...) BalExitOnRootFailureSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BalExitOnLastError(x, f, ...) BalExitOnLastErrorSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BalExitOnNull(p, x, e, f, ...) BalExitOnNullSource(DUTIL_SOURCE_DEFAULT, p, x, e, f, __VA_ARGS__)
+#define BalExitOnNullWithLastError(p, x, f, ...) BalExitOnNullWithLastErrorSource(DUTIL_SOURCE_DEFAULT, p, x, f, __VA_ARGS__)
+#define BalExitWithLastError(x, f, ...) BalExitWithLastErrorSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#ifndef FACILITY_WIX
+#define FACILITY_WIX 500
+#endif
+const LPCWSTR BAL_MANIFEST_FILENAME = L"BootstrapperApplicationData.xml";
+static const HRESULT E_WIXSTDBA_CONDITION_FAILED = MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIX, 1);
+static const HRESULT E_MBAHOST_NET452_ON_WIN7RTM = MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIX, 1000);
+static const HRESULT E_DNCHOST_SCD_RUNTIME_FAILURE = MAKE_HRESULT(SEVERITY_ERROR, FACILITY_WIX, 1001);
+/*******************************************************************
+ BalInitialize - remembers the engine interface to enable logging and
+                 other functions.
+********************************************************************/
+DAPI_(void) BalInitialize(
+    __in IBootstrapperEngine* pEngine
+    );
+/*******************************************************************
+ BalInitializeFromCreateArgs - convenience function to call BalBootstrapperEngineCreate
+                               then pass it along to BalInitialize.
+********************************************************************/
+DAPI_(HRESULT) BalInitializeFromCreateArgs(
+    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+    __out_opt IBootstrapperEngine** ppEngine
+    );
+/*******************************************************************
+ BalUninitialize - cleans up utility layer internals.
+********************************************************************/
+DAPI_(void) BalUninitialize();
+/*******************************************************************
+ BalManifestLoad - loads the Application manifest into an XML document.
+********************************************************************/
+DAPI_(HRESULT) BalManifestLoad(
+    __in HMODULE hUXModule,
+    __out IXMLDOMDocument** ppixdManifest
+    );
+/*******************************************************************
+BalEvaluateCondition - evaluates a condition using variables in the engine.
+********************************************************************/
+DAPI_(HRESULT) BalEvaluateCondition(
+    __in_z LPCWSTR wzCondition,
+    __out BOOL* pf
+    );
+/*******************************************************************
+BalFormatString - formats a string using variables in the engine.
+ Note: Use StrFree() to release psczOut.
+********************************************************************/
+DAPI_(HRESULT) BalFormatString(
+    __in_z LPCWSTR wzFormat,
+    __inout LPWSTR* psczOut
+    );
+/*******************************************************************
+BalGetNumericVariable - gets a number from a variable in the engine.
+ Note: Returns E_NOTFOUND if variable does not exist.
+********************************************************************/
+DAPI_(HRESULT) BalGetNumericVariable(
+    __in_z LPCWSTR wzVariable,
+    __out LONGLONG* pllValue
+    );
+/*******************************************************************
+BalSetNumericVariable - sets a numeric variable in the engine.
+********************************************************************/
+DAPI_(HRESULT) BalSetNumericVariable(
+    __in_z LPCWSTR wzVariable,
+    __in LONGLONG llValue
+    );
+/*******************************************************************
+BalVariableExists - checks if a variable exists in the engine.
+********************************************************************/
+DAPI_(BOOL) BalVariableExists(
+    __in_z LPCWSTR wzVariable
+    );
+/*******************************************************************
+BalGetStringVariable - gets a string from a variable in the engine.
+ Note: Use StrFree() to release psczValue.
+********************************************************************/
+DAPI_(HRESULT) BalGetStringVariable(
+    __in_z LPCWSTR wzVariable,
+    __inout LPWSTR* psczValue
+    );
+/*******************************************************************
+BalSetStringVariable - sets a string variable in the engine.
+********************************************************************/
+DAPI_(HRESULT) BalSetStringVariable(
+    __in_z LPCWSTR wzVariable,
+    __in_z_opt LPCWSTR wzValue,
+    __in BOOL fFormatted
+    );
+/*******************************************************************
+ BalLog - logs a message with the engine.
+********************************************************************/
+DAPIV_(HRESULT) BalLog(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    );
+/*******************************************************************
+ BalLogArgs - logs a message with the engine.
+********************************************************************/
+DAPI_(HRESULT) BalLogArgs(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    );
+/*******************************************************************
+ BalLogError - logs an error message with the engine.
+********************************************************************/
+DAPIV_(HRESULT) BalLogError(
+    __in HRESULT hr,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    );
+/*******************************************************************
+ BalLogErrorArgs - logs an error message with the engine.
+********************************************************************/
+DAPI_(HRESULT) BalLogErrorArgs(
+    __in HRESULT hr,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    );
+/*******************************************************************
+BalLogId - logs a message with the engine with a string embedded in a 
+           MESSAGETABLE resource.
+********************************************************************/
+DAPIV_(HRESULT) BalLogId(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in DWORD dwLogId,
+    __in HMODULE hModule,
+    ...
+    );
+DAPI_(HRESULT) BalLogIdArgs(
+    __in BOOTSTRAPPER_LOG_LEVEL level,
+    __in DWORD dwLogId,
+    __in HMODULE hModule,
+    __in va_list args
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/balutil/packages.config b/src/api/burn/balutil/packages.config
new file mode 100644
index 00000000..08ea3364
--- /dev/null
+++ b/src/api/burn/balutil/packages.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Nerdbank.GitVersioning" version="3.3.37" targetFramework="native" developmentDependency="true" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.141" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.72" targetFramework="native" />
+</packages>
+\ No newline at end of file
diff --git a/src/api/burn/balutil/precomp.cpp b/src/api/burn/balutil/precomp.cpp
new file mode 100644
index 00000000..37664a1c
--- /dev/null
+++ b/src/api/burn/balutil/precomp.cpp
@@ -0,0 +1,3 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
diff --git a/src/api/burn/balutil/precomp.h b/src/api/burn/balutil/precomp.h
new file mode 100644
index 00000000..c500060a
--- /dev/null
+++ b/src/api/burn/balutil/precomp.h
@@ -0,0 +1,32 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <bitsmsg.h>
+#include <msi.h>
+#include <wininet.h>
+#include <CommCtrl.h>
+#include <dutil.h>
+#include <pathutil.h>
+#include <locutil.h>
+#include <memutil.h>
+#include <strutil.h>
+#include <thmutil.h>
+#include <xmlutil.h>
+#include <BootstrapperEngine.h>
+#include <BootstrapperApplication.h>
+#include "IBootstrapperEngine.h"
+#include "IBootstrapperApplication.h"
+#include "BAFunctions.h"
+#include "IBAFunctions.h"
+#include "balutil.h"
+#include "BalBootstrapperEngine.h"
+#include "balcondition.h"
+#include "balinfo.h"
+#include "balretry.h"
diff --git a/src/api/burn/bextutil/BextBundleExtensionEngine.cpp b/src/api/burn/bextutil/BextBundleExtensionEngine.cpp
new file mode 100644
index 00000000..6043e2db
--- /dev/null
+++ b/src/api/burn/bextutil/BextBundleExtensionEngine.cpp
@@ -0,0 +1,344 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+class CBextBundleExtensionEngine : public IBundleExtensionEngine
+{
+public: // IUnknown
+    virtual STDMETHODIMP QueryInterface(
+        __in REFIID riid,
+        __out LPVOID *ppvObject
+        )
+    {
+        if (!ppvObject)
+        {
+            return E_INVALIDARG;
+        }
+        *ppvObject = NULL;
+        if (::IsEqualIID(__uuidof(IBundleExtensionEngine), riid))
+        {
+            *ppvObject = static_cast<IBundleExtensionEngine*>(this);
+        }
+        else if (::IsEqualIID(IID_IUnknown, riid))
+        {
+            *ppvObject = reinterpret_cast<IUnknown*>(this);
+        }
+        else // no interface for requested iid
+        {
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+    virtual STDMETHODIMP_(ULONG) AddRef()
+    {
+        return ::InterlockedIncrement(&this->m_cReferences);
+    }
+    virtual STDMETHODIMP_(ULONG) Release()
+    {
+        long l = ::InterlockedDecrement(&this->m_cReferences);
+        if (0 < l)
+        {
+            return l;
+        }
+        delete this;
+        return 0;
+    }
+public: // IBundleExtensionEngine
+    virtual STDMETHODIMP EscapeString(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_ESCAPESTRING_RESULTS results = { };
+        ExitOnNull(pcchOut, hr, E_INVALIDARG, "pcchOut is required");
+        args.cbSize = sizeof(args);
+        args.wzIn = wzIn;
+        results.cbSize = sizeof(results);
+        results.wzOut = wzOut;
+        results.cchOut = *pcchOut;
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_ESCAPESTRING, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pcchOut = results.cchOut;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP EvaluateCondition(
+        __in_z LPCWSTR wzCondition,
+        __out BOOL* pf
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_EVALUATECONDITION_RESULTS results = { };
+        ExitOnNull(pf, hr, E_INVALIDARG, "pf is required");
+        args.cbSize = sizeof(args);
+        args.wzCondition = wzCondition;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_EVALUATECONDITION, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pf = results.f;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP FormatString(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_FORMATSTRING_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_FORMATSTRING_RESULTS results = { };
+        ExitOnNull(pcchOut, hr, E_INVALIDARG, "pcchOut is required");
+        args.cbSize = sizeof(args);
+        args.wzIn = wzIn;
+        results.cbSize = sizeof(results);
+        results.wzOut = wzOut;
+        results.cchOut = *pcchOut;
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_FORMATSTRING, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pcchOut = results.cchOut;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableNumeric(
+        __in_z LPCWSTR wzVariable,
+        __out LONGLONG* pllValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLENUMERIC_RESULTS results = { };
+        ExitOnNull(pllValue, hr, E_INVALIDARG, "pllValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLENUMERIC, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pllValue = results.llValue;
+    LExit:
+        SecureZeroMemory(&results, sizeof(results));
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableString(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLESTRING_RESULTS results = { };
+        ExitOnNull(pcchValue, hr, E_INVALIDARG, "pcchValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        results.wzValue = wzValue;
+        results.cchValue = *pcchValue;
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLESTRING, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pcchValue = results.cchValue;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP GetVariableVersion(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_RESULTS results = { };
+        ExitOnNull(pcchValue, hr, E_INVALIDARG, "pcchValue is required");
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        results.cbSize = sizeof(results);
+        results.wzValue = wzValue;
+        results.cchValue = *pcchValue;
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_GETVARIABLEVERSION, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pcchValue = results.cchValue;
+    LExit:
+        return hr;
+    }
+    virtual STDMETHODIMP Log(
+        __in BUNDLE_EXTENSION_LOG_LEVEL level,
+        __in_z LPCWSTR wzMessage
+        )
+    {
+        BUNDLE_EXTENSION_ENGINE_LOG_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_LOG_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.level = level;
+        args.wzMessage = wzMessage;
+        results.cbSize = sizeof(results);
+        return m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_LOG, &args, &results, m_pvBundleExtensionEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableNumeric(
+        __in_z LPCWSTR wzVariable,
+        __in LONGLONG llValue
+        )
+    {
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLENUMERIC_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.llValue = llValue;
+        results.cbSize = sizeof(results);
+        return m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLENUMERIC, &args, &results, m_pvBundleExtensionEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableString(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue,
+        __in BOOL fFormatted
+        )
+    {
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLESTRING_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.wzValue = wzValue;
+        args.fFormatted = fFormatted;
+        results.cbSize = sizeof(results);
+        return m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLESTRING, &args, &results, m_pvBundleExtensionEngineProcContext);
+    }
+    virtual STDMETHODIMP SetVariableVersion(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue
+        )
+    {
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_RESULTS results = { };
+        args.cbSize = sizeof(args);
+        args.wzVariable = wzVariable;
+        args.wzValue = wzValue;
+        results.cbSize = sizeof(results);
+        return m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_SETVARIABLEVERSION, &args, &results, m_pvBundleExtensionEngineProcContext);
+    }
+    virtual STDMETHODIMP CompareVersions(
+        __in_z LPCWSTR wzVersion1,
+        __in_z LPCWSTR wzVersion2,
+        __out int* pnResult
+        )
+    {
+        HRESULT hr = S_OK;
+        BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_ARGS args = { };
+        BUNDLE_EXTENSION_ENGINE_COMPAREVERSIONS_RESULTS results = { };
+        ExitOnNull(pnResult, hr, E_INVALIDARG, "pnResult is required");
+        args.cbSize = sizeof(args);
+        args.wzVersion1 = wzVersion1;
+        args.wzVersion2 = wzVersion2;
+        results.cbSize = sizeof(results);
+        hr = m_pfnBundleExtensionEngineProc(BUNDLE_EXTENSION_ENGINE_MESSAGE_COMPAREVERSIONS, &args, &results, m_pvBundleExtensionEngineProcContext);
+        *pnResult = results.nResult;
+    LExit:
+        return hr;
+    }
+public:
+    CBextBundleExtensionEngine(
+        __in PFN_BUNDLE_EXTENSION_ENGINE_PROC pfnBundleExtensionEngineProc,
+        __in_opt LPVOID pvBundleExtensionEngineProcContext
+        )
+    {
+        m_cReferences = 1;
+        m_pfnBundleExtensionEngineProc = pfnBundleExtensionEngineProc;
+        m_pvBundleExtensionEngineProcContext = pvBundleExtensionEngineProcContext;
+    }
+private:
+    long m_cReferences;
+    PFN_BUNDLE_EXTENSION_ENGINE_PROC m_pfnBundleExtensionEngineProc;
+    LPVOID m_pvBundleExtensionEngineProcContext;
+};
+HRESULT BextBundleExtensionEngineCreate(
+    __in PFN_BUNDLE_EXTENSION_ENGINE_PROC pfnBundleExtensionEngineProc,
+    __in_opt LPVOID pvBundleExtensionEngineProcContext,
+    __out IBundleExtensionEngine** ppEngineForExtension
+    )
+{
+    HRESULT hr = S_OK;
+    CBextBundleExtensionEngine* pBundleExtensionEngine = NULL;
+    pBundleExtensionEngine = new CBextBundleExtensionEngine(pfnBundleExtensionEngineProc, pvBundleExtensionEngineProcContext);
+    ExitOnNull(pBundleExtensionEngine, hr, E_OUTOFMEMORY, "Failed to allocate new BextBundleExtensionEngine object.");
+    hr = pBundleExtensionEngine->QueryInterface(IID_PPV_ARGS(ppEngineForExtension));
+    ExitOnFailure(hr, "Failed to QI for IBundleExtensionEngine from BextBundleExtensionEngine object.");
+LExit:
+    ReleaseObject(pBundleExtensionEngine);
+    return hr;
+}
diff --git a/src/api/burn/bextutil/bextutil.cpp b/src/api/burn/bextutil/bextutil.cpp
new file mode 100644
index 00000000..4b22d502
--- /dev/null
+++ b/src/api/burn/bextutil/bextutil.cpp
@@ -0,0 +1,221 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+static IBundleExtensionEngine* vpEngine = NULL;
+// prototypes
+DAPI_(void) BextInitialize(
+    __in IBundleExtensionEngine* pEngine
+    )
+{
+    pEngine->AddRef();
+    ReleaseObject(vpEngine);
+    vpEngine = pEngine;
+}
+DAPI_(HRESULT) BextInitializeFromCreateArgs(
+    __in const BUNDLE_EXTENSION_CREATE_ARGS* pArgs,
+    __out_opt IBundleExtensionEngine** ppEngine
+    )
+{
+    HRESULT hr = S_OK;
+    IBundleExtensionEngine* pEngine = NULL;
+    hr = BextBundleExtensionEngineCreate(pArgs->pfnBundleExtensionEngineProc, pArgs->pvBundleExtensionEngineProcContext, &pEngine);
+    ExitOnFailure(hr, "Failed to create BextBundleExtensionEngine.");
+    BextInitialize(pEngine);
+    if (ppEngine)
+    {
+        *ppEngine = pEngine;
+    }
+    pEngine = NULL;
+LExit:
+    ReleaseObject(pEngine);
+    return hr;
+}
+DAPI_(void) BextUninitialize()
+{
+    ReleaseNullObject(vpEngine);
+}
+DAPI_(HRESULT) BextGetBundleExtensionDataNode(
+    __in IXMLDOMDocument* pixdManifest,
+    __in LPCWSTR wzExtensionId,
+    __out IXMLDOMNode** ppixnBundleExtension
+    )
+{
+    HRESULT hr = S_OK;
+    IXMLDOMElement* pixeBundleExtensionData = NULL;
+    IXMLDOMNodeList* pixnNodes = NULL;
+    IXMLDOMNode* pixnNode = NULL;
+    DWORD cNodes = 0;
+    LPWSTR sczId = NULL;
+    // Get BundleExtensionData element.
+    hr = pixdManifest->get_documentElement(&pixeBundleExtensionData);
+    ExitOnFailure(hr, "Failed to get BundleExtensionData element.");
+    // Select BundleExtension nodes.
+    hr = XmlSelectNodes(pixeBundleExtensionData, L"BundleExtension", &pixnNodes);
+    ExitOnFailure(hr, "Failed to select BundleExtension nodes.");
+    // Get BundleExtension node count.
+    hr = pixnNodes->get_length((long*)&cNodes);
+    ExitOnFailure(hr, "Failed to get BundleExtension node count.");
+    if (!cNodes)
+    {
+        ExitFunction();
+    }
+    // Find requested extension.
+    for (DWORD i = 0; i < cNodes; ++i)
+    {
+        hr = XmlNextElement(pixnNodes, &pixnNode, NULL);
+        ExitOnFailure(hr, "Failed to get next node.");
+        // @Id
+        hr = XmlGetAttributeEx(pixnNode, L"Id", &sczId);
+        ExitOnFailure(hr, "Failed to get @Id.");
+        if (CSTR_EQUAL == ::CompareStringW(LOCALE_INVARIANT, 0, sczId, -1, wzExtensionId, -1))
+        {
+            *ppixnBundleExtension = pixnNode;
+            pixnNode = NULL;
+            ExitFunction1(hr = S_OK);
+        }
+        // Prepare next iteration.
+        ReleaseNullObject(pixnNode);
+    }
+    hr = E_NOTFOUND;
+LExit:
+    ReleaseStr(sczId);
+    ReleaseObject(pixnNode);
+    ReleaseObject(pixnNodes);
+    ReleaseObject(pixeBundleExtensionData);
+    return hr;
+}
+DAPIV_(HRESULT) BextLog(
+    __in BUNDLE_EXTENSION_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    )
+{
+    HRESULT hr = S_OK;
+    va_list args;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BextInitialize() must be called first.");
+    }
+    va_start(args, szFormat);
+    hr = BextLogArgs(level, szFormat, args);
+    va_end(args);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BextLogArgs(
+    __in BUNDLE_EXTENSION_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    )
+{
+    HRESULT hr = S_OK;
+    LPSTR sczFormattedAnsi = NULL;
+    LPWSTR sczMessage = NULL;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BextInitialize() must be called first.");
+    }
+    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
+    ExitOnFailure(hr, "Failed to format log string.");
+    hr = StrAllocStringAnsi(&sczMessage, sczFormattedAnsi, 0, CP_UTF8);
+    ExitOnFailure(hr, "Failed to convert log string to Unicode.");
+    hr = vpEngine->Log(level, sczMessage);
+LExit:
+    ReleaseStr(sczMessage);
+    ReleaseStr(sczFormattedAnsi);
+    return hr;
+}
+DAPIV_(HRESULT) BextLogError(
+    __in HRESULT hrError,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    )
+{
+    HRESULT hr = S_OK;
+    va_list args;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BextInitialize() must be called first.");
+    }
+    va_start(args, szFormat);
+    hr = BextLogErrorArgs(hrError, szFormat, args);
+    va_end(args);
+LExit:
+    return hr;
+}
+DAPI_(HRESULT) BextLogErrorArgs(
+    __in HRESULT hrError,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    )
+{
+    HRESULT hr = S_OK;
+    LPSTR sczFormattedAnsi = NULL;
+    LPWSTR sczMessage = NULL;
+    if (!vpEngine)
+    {
+        hr = E_POINTER;
+        ExitOnRootFailure(hr, "BextInitialize() must be called first.");
+    }
+    hr = StrAnsiAllocFormattedArgs(&sczFormattedAnsi, szFormat, args);
+    ExitOnFailure(hr, "Failed to format error log string.");
+    hr = StrAllocFormatted(&sczMessage, L"Error 0x%08x: %S", hrError, sczFormattedAnsi);
+    ExitOnFailure(hr, "Failed to prepend error number to error log string.");
+    hr = vpEngine->Log(BUNDLE_EXTENSION_LOG_LEVEL_ERROR, sczMessage);
+LExit:
+    ReleaseStr(sczMessage);
+    ReleaseStr(sczFormattedAnsi);
+    return hr;
+}
diff --git a/src/api/burn/bextutil/bextutil.nuspec b/src/api/burn/bextutil/bextutil.nuspec
new file mode 100644
index 00000000..752dbb97
--- /dev/null
+++ b/src/api/burn/bextutil/bextutil.nuspec
@@ -0,0 +1,31 @@
+<?xml version="1.0"?>
+<package >
+  <metadata>
+    <id>$id$</id>
+    <version>$version$</version>
+    <authors>$authors$</authors>
+    <owners>$authors$</owners>
+    <license type="expression">MS-RL</license>
+    <projectUrl>https://github.com/wixtoolset/balutil</projectUrl>
+    <requireLicenseAcceptance>false</requireLicenseAcceptance>
+    <description>$description$</description>
+    <copyright>$copyright$</copyright>
+    <dependencies>
+        <dependency id="WixToolset.BootstrapperCore.Native" version="[4,5)" />
+        <dependency id="WixToolset.DUtil" version="[4,5)" />
+    </dependencies>
+  </metadata>
+  <files>
+    <file src="build\$id$.props" target="build\" />
+    <file src="inc\*" target="build\native\include" />
+    <file src="..\..\build\$configuration$\v140\x86\bextutil.lib" target="build\native\v140\x86" />
+    <file src="..\..\build\$configuration$\v140\x64\bextutil.lib" target="build\native\v140\x64" />
+    <file src="..\..\build\$configuration$\v141\x86\bextutil.lib" target="build\native\v141\x86" />
+    <file src="..\..\build\$configuration$\v141\x64\bextutil.lib" target="build\native\v141\x64" />
+    <file src="..\..\build\$configuration$\v141\ARM64\bextutil.lib" target="build\native\v141\ARM64" />
+    <file src="..\..\build\$configuration$\v142\x86\bextutil.lib" target="build\native\v142\x86" />
+    <file src="..\..\build\$configuration$\v142\x64\bextutil.lib" target="build\native\v142\x64" />
+    <file src="..\..\build\$configuration$\v142\ARM64\bextutil.lib" target="build\native\v142\ARM64" />
+  </files>
+</package>
diff --git a/src/api/burn/bextutil/bextutil.vcxproj b/src/api/burn/bextutil/bextutil.vcxproj
new file mode 100644
index 00000000..b9334cf3
--- /dev/null
+++ b/src/api/burn/bextutil/bextutil.vcxproj
@@ -0,0 +1,90 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{06027492-1CB9-48BC-B31E-C1F9356ED07E}</ProjectGuid>
+    <ConfigurationType>StaticLibrary</ConfigurationType>
+    <TargetName>bextutil</TargetName>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>MultiByte</CharacterSet>
+    <Description>WiX Toolset Bundle Extension native utility library</Description>
+    <PackageId>WixToolset.BextUtil</PackageId>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <Import Project="..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" />
+  <Import Project="..\NativeMultiTargeting.Build.props" />
+  <ImportGroup Label="ExtensionSettings">
+  </ImportGroup>
+  <ImportGroup Label="Shared">
+  </ImportGroup>
+  <PropertyGroup>
+    <ProjectAdditionalIncludeDirectories>$(ProjectDir)..\inc</ProjectAdditionalIncludeDirectories>
+  </PropertyGroup>
+  <ItemGroup>
+    <ClCompile Include="BextBundleExtensionEngine.cpp" />
+    <ClCompile Include="bextutil.cpp" />
+    <ClCompile Include="precomp.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="inc\BextBaseBundleExtension.h" />
+    <ClInclude Include="inc\BextBaseBundleExtensionProc.h" />
+    <ClInclude Include="inc\BextBundleExtensionEngine.h" />
+    <ClInclude Include="inc\bextutil.h" />
+    <ClInclude Include="inc\IBundleExtension.h" />
+    <ClInclude Include="inc\IBundleExtensionEngine.h" />
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props'))" />
+  </Target>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/bextutil/build/WixToolset.BextUtil.props b/src/api/burn/bextutil/build/WixToolset.BextUtil.props
new file mode 100644
index 00000000..60a2db54
--- /dev/null
+++ b/src/api/burn/bextutil/build/WixToolset.BextUtil.props
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemDefinitionGroup>
+    <ClCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ClCompile>
+    <ResourceCompile>
+      <AdditionalIncludeDirectories>$(MSBuildThisFileDirectory)native\include\;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
+    </ResourceCompile>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v140')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v140\$(PlatformTarget)\bextutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v141')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v141\$(PlatformTarget)\bextutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition=" $(PlatformToolset.ToLower().StartsWith('v142')) ">
+    <Link>
+      <AdditionalDependencies>$(MSBuildThisFileDirectory)native\v142\$(PlatformTarget)\bextutil.lib;%(AdditionalDependencies)</AdditionalDependencies>
+    </Link>
+  </ItemDefinitionGroup>
+</Project>
diff --git a/src/api/burn/bextutil/inc/BextBaseBundleExtension.h b/src/api/burn/bextutil/inc/BextBaseBundleExtension.h
new file mode 100644
index 00000000..69c338e4
--- /dev/null
+++ b/src/api/burn/bextutil/inc/BextBaseBundleExtension.h
@@ -0,0 +1,120 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include "BundleExtensionEngine.h"
+#include "BundleExtension.h"
+#include "IBundleExtensionEngine.h"
+#include "IBundleExtension.h"
+#include "bextutil.h"
+class CBextBaseBundleExtension : public IBundleExtension
+{
+public: // IUnknown
+    virtual STDMETHODIMP QueryInterface(
+        __in REFIID riid,
+        __out LPVOID *ppvObject
+        )
+    {
+        if (!ppvObject)
+        {
+            return E_INVALIDARG;
+        }
+        *ppvObject = NULL;
+        if (::IsEqualIID(__uuidof(IBundleExtension), riid))
+        {
+            *ppvObject = static_cast<IBundleExtension*>(this);
+        }
+        else if (::IsEqualIID(IID_IUnknown, riid))
+        {
+            *ppvObject = static_cast<IUnknown*>(this);
+        }
+        else // no interface for requested iid
+        {
+            return E_NOINTERFACE;
+        }
+        AddRef();
+        return S_OK;
+    }
+    virtual STDMETHODIMP_(ULONG) AddRef()
+    {
+        return ::InterlockedIncrement(&this->m_cReferences);
+    }
+    virtual STDMETHODIMP_(ULONG) Release()
+    {
+        long l = ::InterlockedDecrement(&this->m_cReferences);
+        if (0 < l)
+        {
+            return l;
+        }
+        delete this;
+        return 0;
+    }
+public: // IBundleExtension
+    virtual STDMETHODIMP Search(
+        __in LPCWSTR /*wzId*/,
+        __in LPCWSTR /*wzVariable*/
+        )
+    {
+        return E_NOTIMPL;
+    }
+    virtual STDMETHODIMP BundleExtensionProc(
+        __in BUNDLE_EXTENSION_MESSAGE /*message*/,
+        __in const LPVOID /*pvArgs*/,
+        __inout LPVOID /*pvResults*/,
+        __in_opt LPVOID /*pvContext*/
+        )
+    {
+        return E_NOTIMPL;
+    }
+public: //CBextBaseBundleExtension
+    virtual STDMETHODIMP Initialize(
+        __in const BUNDLE_EXTENSION_CREATE_ARGS* pCreateArgs
+    )
+    {
+        HRESULT hr = S_OK;
+        hr = StrAllocString(&m_sczBundleExtensionDataPath, pCreateArgs->wzBundleExtensionDataPath, 0);
+        ExitOnFailure(hr, "Failed to copy BundleExtensionDataPath.");
+    LExit:
+        return hr;
+    }
+protected:
+    CBextBaseBundleExtension(
+        __in IBundleExtensionEngine* pEngine
+        )
+    {
+        m_cReferences = 1;
+        pEngine->AddRef();
+        m_pEngine = pEngine;
+        m_sczBundleExtensionDataPath = NULL;
+    }
+    virtual ~CBextBaseBundleExtension()
+    {
+        ReleaseNullObject(m_pEngine);
+        ReleaseStr(m_sczBundleExtensionDataPath);
+    }
+protected:
+    IBundleExtensionEngine* m_pEngine;
+    LPWSTR m_sczBundleExtensionDataPath;
+private:
+    long m_cReferences;
+};
diff --git a/src/api/burn/bextutil/inc/BextBaseBundleExtensionProc.h b/src/api/burn/bextutil/inc/BextBaseBundleExtensionProc.h
new file mode 100644
index 00000000..f71e3b92
--- /dev/null
+++ b/src/api/burn/bextutil/inc/BextBaseBundleExtensionProc.h
@@ -0,0 +1,48 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include "BundleExtensionEngine.h"
+#include "BundleExtension.h"
+#include "IBundleExtensionEngine.h"
+#include "IBundleExtension.h"
+static HRESULT BextBaseBEProcSearch(
+    __in IBundleExtension* pBE,
+    __in BUNDLE_EXTENSION_SEARCH_ARGS* pArgs,
+    __inout BUNDLE_EXTENSION_SEARCH_RESULTS* /*pResults*/
+    )
+{
+    return pBE->Search(pArgs->wzId, pArgs->wzVariable);
+}
+/*******************************************************************
+BextBaseBundleExtensionProc - requires pvContext to be of type IBundleExtension.
+                              Provides a default mapping between the message based
+                              BundleExtension interface and the COM-based BundleExtension interface.
+*******************************************************************/
+static HRESULT WINAPI BextBaseBundleExtensionProc(
+    __in BUNDLE_EXTENSION_MESSAGE message,
+    __in const LPVOID pvArgs,
+    __inout LPVOID pvResults,
+    __in_opt LPVOID pvContext
+    )
+{
+    IBundleExtension* pBE = reinterpret_cast<IBundleExtension*>(pvContext);
+    HRESULT hr = pBE->BundleExtensionProc(message, pvArgs, pvResults, pvContext);
+    
+    if (E_NOTIMPL == hr)
+    {
+        switch (message)
+        {
+        case BUNDLE_EXTENSION_MESSAGE_SEARCH:
+            hr = BextBaseBEProcSearch(pBE, reinterpret_cast<BUNDLE_EXTENSION_SEARCH_ARGS*>(pvArgs), reinterpret_cast<BUNDLE_EXTENSION_SEARCH_RESULTS*>(pvResults));
+            break;
+        }
+    }
+    return hr;
+}
diff --git a/src/api/burn/bextutil/inc/BextBundleExtensionEngine.h b/src/api/burn/bextutil/inc/BextBundleExtensionEngine.h
new file mode 100644
index 00000000..9fdcb700
--- /dev/null
+++ b/src/api/burn/bextutil/inc/BextBundleExtensionEngine.h
@@ -0,0 +1,17 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#ifdef __cplusplus
+extern "C" {
+#endif
+// function declarations
+HRESULT BextBundleExtensionEngineCreate(
+    __in PFN_BUNDLE_EXTENSION_ENGINE_PROC pfnBundleExtensionEngineProc,
+    __in_opt LPVOID pvBundleExtensionEngineProcContext,
+    __out IBundleExtensionEngine** ppEngineForExtension
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/bextutil/inc/IBundleExtension.h b/src/api/burn/bextutil/inc/IBundleExtension.h
new file mode 100644
index 00000000..7516c11b
--- /dev/null
+++ b/src/api/burn/bextutil/inc/IBundleExtension.h
@@ -0,0 +1,20 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+DECLARE_INTERFACE_IID_(IBundleExtension, IUnknown, "93123C9D-796B-4FCD-A507-6EDEF9A925FD")
+{
+    STDMETHOD(Search)(
+        __in LPCWSTR wzId,
+        __in LPCWSTR wzVariable
+        ) = 0;
+    // BundleExtensionProc - The PFN_BUNDLE_EXTENSION_PROC can call this method to give the BundleExtension raw access to the callback from the engine.
+    //                       This might be used to help the BundleExtension support more than one version of the engine.
+    STDMETHOD(BundleExtensionProc)(
+        __in BUNDLE_EXTENSION_MESSAGE message,
+        __in const LPVOID pvArgs,
+        __inout LPVOID pvResults,
+        __in_opt LPVOID pvContext
+        ) = 0;
+};
diff --git a/src/api/burn/bextutil/inc/IBundleExtensionEngine.h b/src/api/burn/bextutil/inc/IBundleExtensionEngine.h
new file mode 100644
index 00000000..63dadb06
--- /dev/null
+++ b/src/api/burn/bextutil/inc/IBundleExtensionEngine.h
@@ -0,0 +1,67 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+DECLARE_INTERFACE_IID_(IBundleExtensionEngine, IUnknown, "9D027A39-F6B6-42CC-9737-C185089EB263")
+{
+    STDMETHOD(EscapeString)(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        ) = 0;
+    STDMETHOD(EvaluateCondition)(
+        __in_z LPCWSTR wzCondition,
+        __out BOOL* pf
+        ) = 0;
+    STDMETHOD(FormatString)(
+        __in_z LPCWSTR wzIn,
+        __out_ecount_opt(*pcchOut) LPWSTR wzOut,
+        __inout SIZE_T* pcchOut
+        ) = 0;
+    STDMETHOD(GetVariableNumeric)(
+        __in_z LPCWSTR wzVariable,
+        __out LONGLONG* pllValue
+        ) = 0;
+    STDMETHOD(GetVariableString)(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        ) = 0;
+    STDMETHOD(GetVariableVersion)(
+        __in_z LPCWSTR wzVariable,
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout SIZE_T* pcchValue
+        ) = 0;
+    STDMETHOD(Log)(
+        __in BUNDLE_EXTENSION_LOG_LEVEL level,
+        __in_z LPCWSTR wzMessage
+        ) = 0;
+    STDMETHOD(SetVariableNumeric)(
+        __in_z LPCWSTR wzVariable,
+        __in LONGLONG llValue
+        ) = 0;
+    STDMETHOD(SetVariableString)(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue,
+        __in BOOL fFormatted
+        ) = 0;
+    STDMETHOD(SetVariableVersion)(
+        __in_z LPCWSTR wzVariable,
+        __in_z_opt LPCWSTR wzValue
+        ) = 0;
+    STDMETHOD(CompareVersions)(
+        __in_z LPCWSTR wzVersion1,
+        __in_z LPCWSTR wzVersion2,
+        __out int* pnResult
+        ) = 0;
+};
diff --git a/src/api/burn/bextutil/inc/bextutil.h b/src/api/burn/bextutil/inc/bextutil.h
new file mode 100644
index 00000000..ac9c0062
--- /dev/null
+++ b/src/api/burn/bextutil/inc/bextutil.h
@@ -0,0 +1,106 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "dutil.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+#define BextExitOnFailureSource(d, x, f, ...) if (FAILED(x)) { BextLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BextExitOnRootFailureSource(d, x, f, ...) if (FAILED(x)) { BextLogError(x, f, __VA_ARGS__); Dutil_RootFailure(__FILE__, __LINE__, x); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BextExitOnLastErrorSource(d, x, f, ...) { x = ::GetLastError(); x = HRESULT_FROM_WIN32(x); if (FAILED(x)) { BextLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; } }
+#define BextExitOnNullSource(d, p, x, e, f, ...) if (NULL == p) { x = e; BextLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BextExitOnNullWithLastErrorSource(d, p, x, f, ...) if (NULL == p) { DWORD Dutil_er = ::GetLastError(); x = HRESULT_FROM_WIN32(Dutil_er); if (!FAILED(x)) { x = E_FAIL; } BextLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BextExitWithLastErrorSource(d, x, f, ...) { DWORD Dutil_er = ::GetLastError(); x = HRESULT_FROM_WIN32(Dutil_er); if (!FAILED(x)) { x = E_FAIL; } BextLogError(x, f, __VA_ARGS__); ExitTraceSource(d, x, f, __VA_ARGS__); goto LExit; }
+#define BextExitOnFailure(x, f, ...) BextExitOnFailureSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BextExitOnRootFailure(x, f, ...) BextExitOnRootFailureSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BextExitOnLastError(x, f, ...) BextExitOnLastErrorSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+#define BextExitOnNull(p, x, e, f, ...) BextExitOnNullSource(DUTIL_SOURCE_DEFAULT, p, x, e, f, __VA_ARGS__)
+#define BextExitOnNullWithLastError(p, x, f, ...) BextExitOnNullWithLastErrorSource(DUTIL_SOURCE_DEFAULT, p, x, f, __VA_ARGS__)
+#define BextExitWithLastError(x, f, ...) BextExitWithLastErrorSource(DUTIL_SOURCE_DEFAULT, x, f, __VA_ARGS__)
+const LPCWSTR BUNDLE_EXTENSION_MANIFEST_FILENAME = L"BundleExtensionData.xml";
+/*******************************************************************
+ BextInitialize - remembers the engine interface to enable logging and
+                  other functions.
+********************************************************************/
+DAPI_(void) BextInitialize(
+    __in IBundleExtensionEngine* pEngine
+    );
+/*******************************************************************
+ BextInitializeFromCreateArgs - convenience function to call BextBundleExtensionEngineCreate
+                                then pass it along to BextInitialize.
+********************************************************************/
+DAPI_(HRESULT) BextInitializeFromCreateArgs(
+    __in const BUNDLE_EXTENSION_CREATE_ARGS* pArgs,
+    __out IBundleExtensionEngine** ppEngine
+    );
+/*******************************************************************
+ BextUninitialize - cleans up utility layer internals.
+********************************************************************/
+DAPI_(void) BextUninitialize();
+/*******************************************************************
+ BextGetBundleExtensionDataNode - gets the requested BundleExtension node.
+********************************************************************/
+DAPI_(HRESULT) BextGetBundleExtensionDataNode(
+    __in IXMLDOMDocument* pixdManifest,
+    __in LPCWSTR wzExtensionId,
+    __out IXMLDOMNode** ppixnBundleExtension
+    );
+/*******************************************************************
+ BextLog - logs a message with the engine.
+********************************************************************/
+DAPIV_(HRESULT) BextLog(
+    __in BUNDLE_EXTENSION_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    );
+/*******************************************************************
+ BextLogArgs - logs a message with the engine.
+********************************************************************/
+DAPI_(HRESULT) BextLogArgs(
+    __in BUNDLE_EXTENSION_LOG_LEVEL level,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    );
+/*******************************************************************
+ BextLogError - logs an error message with the engine.
+********************************************************************/
+DAPIV_(HRESULT) BextLogError(
+    __in HRESULT hr,
+    __in_z __format_string LPCSTR szFormat,
+    ...
+    );
+/*******************************************************************
+ BextLogErrorArgs - logs an error message with the engine.
+********************************************************************/
+DAPI_(HRESULT) BextLogErrorArgs(
+    __in HRESULT hr,
+    __in_z __format_string LPCSTR szFormat,
+    __in va_list args
+    );
+#ifdef __cplusplus
+}
+#endif
diff --git a/src/api/burn/bextutil/packages.config b/src/api/burn/bextutil/packages.config
new file mode 100644
index 00000000..08ea3364
--- /dev/null
+++ b/src/api/burn/bextutil/packages.config
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Nerdbank.GitVersioning" version="3.3.37" targetFramework="native" developmentDependency="true" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.141" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.72" targetFramework="native" />
+</packages>
+\ No newline at end of file
diff --git a/src/api/burn/bextutil/precomp.cpp b/src/api/burn/bextutil/precomp.cpp
new file mode 100644
index 00000000..37664a1c
--- /dev/null
+++ b/src/api/burn/bextutil/precomp.cpp
@@ -0,0 +1,3 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
diff --git a/src/api/burn/bextutil/precomp.h b/src/api/burn/bextutil/precomp.h
new file mode 100644
index 00000000..5d1dd20b
--- /dev/null
+++ b/src/api/burn/bextutil/precomp.h
@@ -0,0 +1,22 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <strsafe.h>
+#include <msxml2.h>
+#include <dutil.h>
+#include <locutil.h>
+#include <memutil.h>
+#include <strutil.h>
+#include <xmlutil.h>
+#include <BundleExtensionEngine.h>
+#include <BundleExtension.h>
+#include "IBundleExtensionEngine.h"
+#include "IBundleExtension.h"
+#include "bextutil.h"
+#include "BextBundleExtensionEngine.h"
diff --git a/src/api/burn/mbanative/mbanative.cpp b/src/api/burn/mbanative/mbanative.cpp
new file mode 100644
index 00000000..98ea3c30
--- /dev/null
+++ b/src/api/burn/mbanative/mbanative.cpp
@@ -0,0 +1,29 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+#include "BalBaseBootstrapperApplicationProc.h"
+extern "C" HRESULT WINAPI InitializeFromCreateArgs(
+    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+    __inout BOOTSTRAPPER_COMMAND* pCommand,
+    __out IBootstrapperEngine** ppEngine
+    )
+{
+    HRESULT hr = S_OK;
+    hr = BalInitializeFromCreateArgs(pArgs, ppEngine);
+    ExitOnFailure(hr, "Failed to initialize Bal.");
+    memcpy_s(pCommand, pCommand->cbSize, pArgs->pCommand, min(pArgs->pCommand->cbSize, pCommand->cbSize));
+LExit:
+    return hr;
+}
+extern "C" void WINAPI StoreBAInCreateResults(
+    __inout BOOTSTRAPPER_CREATE_RESULTS* pResults,
+    __in IBootstrapperApplication* pBA
+    )
+{
+    pResults->pfnBootstrapperApplicationProc = BalBaseBootstrapperApplicationProc;
+    pResults->pvBootstrapperApplicationProcContext = pBA;
+}
diff --git a/src/api/burn/mbanative/mbanative.def b/src/api/burn/mbanative/mbanative.def
new file mode 100644
index 00000000..28e923b6
--- /dev/null
+++ b/src/api/burn/mbanative/mbanative.def
@@ -0,0 +1,12 @@
+; Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+EXPORTS
+    InitializeFromCreateArgs
+    StoreBAInCreateResults
+    VerCompareParsedVersions
+    VerCompareStringVersions
+    VerCopyVersion
+    VerFreeVersion
+    VerParseVersion
+    VerVersionFromQword
diff --git a/src/api/burn/mbanative/mbanative.vcxproj b/src/api/burn/mbanative/mbanative.vcxproj
new file mode 100644
index 00000000..f91fe3be
--- /dev/null
+++ b/src/api/burn/mbanative/mbanative.vcxproj
@@ -0,0 +1,102 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.props" Condition="Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.props')" />
+  <Import Project="..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.props" Condition="Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.props')" />
+  <Import Project="..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.props" Condition="Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|ARM64">
+      <Configuration>Debug</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|ARM64">
+      <Configuration>Release</Configuration>
+      <Platform>ARM64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Debug|x64">
+      <Configuration>Debug</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|x64">
+      <Configuration>Release</Configuration>
+      <Platform>x64</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectGuid>{665E0441-17F9-4105-B202-EDF274657F6E}</ProjectGuid>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <PlatformToolset>v142</PlatformToolset>
+    <CharacterSet>Unicode</CharacterSet>
+    <TargetName>mbanative</TargetName>
+    <ProjectModuleDefinitionFile>mbanative.def</ProjectModuleDefinitionFile>
+    <EnableSourceLink Condition=" '$(PlatformToolset)'=='v140' ">false</EnableSourceLink>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <Import Project="..\NativeMultiTargeting.Build.props" />
+  <ImportGroup Label="Shared">
+    <Import Project="..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.targets" Condition="Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.targets')" />
+    <Import Project="..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.targets" Condition="Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.targets')" />
+    <Import Project="..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.targets" Condition="Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.targets')" />
+    <Import Project="..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets" Condition="Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" />
+  </ImportGroup>
+  <PropertyGroup>
+    <ProjectAdditionalIncludeDirectories>..\balutil\inc</ProjectAdditionalIncludeDirectories>
+    <ProjectAdditionalLinkLibraries>balutil.lib</ProjectAdditionalLinkLibraries>
+  </PropertyGroup>
+  <ItemGroup>
+    <ClCompile Include="mbanative.cpp" />
+    <ClCompile Include="precomp.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="mbanative.def" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\balutil\balutil.vcxproj">
+      <Project>{EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.props'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.Build.Tasks.Git.1.0.0\build\Microsoft.Build.Tasks.Git.targets'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.props'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.Common.1.0.0\build\Microsoft.SourceLink.Common.targets'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.props'))" />
+    <Error Condition="!Exists('..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Microsoft.SourceLink.GitHub.1.0.0\build\Microsoft.SourceLink.GitHub.targets'))" />
+    <Error Condition="!Exists('..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.3.3.37\build\Nerdbank.GitVersioning.targets'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props'))" />
+  </Target>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/mbanative/packages.config b/src/api/burn/mbanative/packages.config
new file mode 100644
index 00000000..745fcae9
--- /dev/null
+++ b/src/api/burn/mbanative/packages.config
@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="Microsoft.Build.Tasks.Git" version="1.0.0" targetFramework="native" developmentDependency="true" />
+  <package id="Microsoft.SourceLink.Common" version="1.0.0" targetFramework="native" developmentDependency="true" />
+  <package id="Microsoft.SourceLink.GitHub" version="1.0.0" targetFramework="native" developmentDependency="true" />
+  <package id="Nerdbank.GitVersioning" version="3.3.37" targetFramework="native" developmentDependency="true" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.141" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.72" targetFramework="native" />
+</packages>
+\ No newline at end of file
diff --git a/src/api/burn/mbanative/precomp.cpp b/src/api/burn/mbanative/precomp.cpp
new file mode 100644
index 00000000..37664a1c
--- /dev/null
+++ b/src/api/burn/mbanative/precomp.cpp
@@ -0,0 +1,3 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
diff --git a/src/api/burn/mbanative/precomp.h b/src/api/burn/mbanative/precomp.h
new file mode 100644
index 00000000..2e2f3ff8
--- /dev/null
+++ b/src/api/burn/mbanative/precomp.h
@@ -0,0 +1,16 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <msiquery.h>
+#include <dutil.h>
+#include <verutil.h>
+#include <BootstrapperEngine.h>
+#include <BootstrapperApplication.h>
+#include <IBootstrapperEngine.h>
+#include <IBootstrapperApplication.h>
+#include <balutil.h>
diff --git a/src/api/burn/nuget.config b/src/api/burn/nuget.config
new file mode 100644
index 00000000..2c6c5608
--- /dev/null
+++ b/src/api/burn/nuget.config
@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <packageSources>
+    <clear />
+    <add key="wixbuildtools" value="https://ci.appveyor.com/nuget/wixbuildtools" />
+    <add key="wixtoolset-burn" value="https://ci.appveyor.com/nuget/wixtoolset-burn" />
+    <add key="wixtoolset-dutil" value="https://ci.appveyor.com/nuget/wixtoolset-dutil" />
+    <add key="api.nuget.org" value="https://api.nuget.org/v3/index.json" protocolVersion="3" />
+  </packageSources>
+</configuration>
+\ No newline at end of file
diff --git a/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj b/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj
new file mode 100644
index 00000000..d3a81e2a
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj
@@ -0,0 +1,76 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props" Condition="Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props')" />
+  <Import Project="..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props" Condition="Exists('..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectTypes>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}</ProjectTypes>
+    <ProjectGuid>{9B507AF9-035E-4DB6-8C0C-5DCC3FEF2631}</ProjectGuid>
+    <RootNamespace>UnitTest</RootNamespace>
+    <Keyword>ManagedCProj</Keyword>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <CharacterSet>Unicode</CharacterSet>
+    <CLRSupport>true</CLRSupport>
+    <SignOutput>false</SignOutput>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <ProjectAdditionalIncludeDirectories>..\..\balutil\inc</ProjectAdditionalIncludeDirectories>
+    <ProjectAdditionalLinkLibraries>comctl32.lib;gdiplus.lib;msimg32.lib;shlwapi.lib;wininet.lib</ProjectAdditionalLinkLibraries>
+  </PropertyGroup>
+  <ItemGroup>
+    <ClCompile Include="precomp.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+      <!-- Warnings from referencing netstandard dlls -->
+      <DisableSpecificWarnings>4564;4691</DisableSpecificWarnings>
+    </ClCompile>
+    <ClCompile Include="TestBAFunctions.cpp" />
+    <ClCompile Include="TestBootstrapperApplication.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="WixBuildTools.TestSupport">
+      <HintPath>..\..\..\packages\WixBuildTools.TestSupport.4.0.50\lib\net472\WixBuildTools.TestSupport.dll</HintPath>
+    </Reference>
+    <Reference Include="WixBuildTools.TestSupport.Native">
+      <HintPath>..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\lib\net472\WixBuildTools.TestSupport.Native.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\balutil\balutil.vcxproj">
+      <Project>{EDCB8095-0E6A-43E0-BC33-C4F762FC5CDB}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Import Project="..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets" Condition="Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props'))" />
+  </Target>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj.filters b/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj.filters
new file mode 100644
index 00000000..85f31076
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/BalUtilUnitTest.vcxproj.filters
@@ -0,0 +1,33 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="precomp.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="TestBAFunctions.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="TestBootstrapperApplication.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/test/BalUtilUnitTest/TestBAFunctions.cpp b/src/api/burn/test/BalUtilUnitTest/TestBAFunctions.cpp
new file mode 100644
index 00000000..927a8d10
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/TestBAFunctions.cpp
@@ -0,0 +1,41 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+#include "BalBaseBAFunctions.h"
+#include "BalBaseBAFunctionsProc.h"
+class CTestBAFunctions : public CBalBaseBAFunctions
+{
+public:
+    CTestBAFunctions(
+        __in HMODULE hModule,
+        __in IBootstrapperEngine* pEngine,
+        __in const BA_FUNCTIONS_CREATE_ARGS* pArgs
+        ) : CBalBaseBAFunctions(hModule, pEngine, pArgs)
+    {
+    }
+};
+HRESULT CreateBAFunctions(
+    __in HMODULE hModule,
+    __in IBootstrapperEngine* pEngine,
+    __in const BA_FUNCTIONS_CREATE_ARGS* pArgs,
+    __in BA_FUNCTIONS_CREATE_RESULTS* pResults,
+    __out IBAFunctions** ppApplication
+    )
+{
+    HRESULT hr = S_OK;
+    CTestBAFunctions* pApplication = NULL;
+    pApplication = new CTestBAFunctions(hModule, pEngine, pArgs);
+    ExitOnNull(pApplication, hr, E_OUTOFMEMORY, "Failed to create new test bafunctions object.");
+    pResults->pfnBAFunctionsProc = BalBaseBAFunctionsProc;
+    pResults->pvBAFunctionsProcContext = pApplication;
+    *ppApplication = pApplication;
+    pApplication = NULL;
+LExit:
+    ReleaseObject(pApplication);
+    return hr;
+}
diff --git a/src/api/burn/test/BalUtilUnitTest/TestBootstrapperApplication.cpp b/src/api/burn/test/BalUtilUnitTest/TestBootstrapperApplication.cpp
new file mode 100644
index 00000000..13d22e72
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/TestBootstrapperApplication.cpp
@@ -0,0 +1,39 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+#include "BalBaseBootstrapperApplication.h"
+#include "BalBaseBootstrapperApplicationProc.h"
+class CTestBootstrapperApplication : public CBalBaseBootstrapperApplication
+{
+public:
+    CTestBootstrapperApplication(
+        __in IBootstrapperEngine* pEngine,
+        __in const BOOTSTRAPPER_CREATE_ARGS* pArgs
+        ) : CBalBaseBootstrapperApplication(pEngine, pArgs)
+    {
+    }
+};
+HRESULT CreateBootstrapperApplication(
+    __in IBootstrapperEngine* pEngine,
+    __in const BOOTSTRAPPER_CREATE_ARGS* pArgs,
+    __inout BOOTSTRAPPER_CREATE_RESULTS* pResults,
+    __out IBootstrapperApplication** ppApplication
+    )
+{
+    HRESULT hr = S_OK;
+    CTestBootstrapperApplication* pApplication = NULL;
+    pApplication = new CTestBootstrapperApplication(pEngine, pArgs);
+    ExitOnNull(pApplication, hr, E_OUTOFMEMORY, "Failed to create new test bootstrapper application object.");
+    pResults->pfnBootstrapperApplicationProc = BalBaseBootstrapperApplicationProc;
+    pResults->pvBootstrapperApplicationProcContext = pApplication;
+    *ppApplication = pApplication;
+    pApplication = NULL;
+LExit:
+    ReleaseObject(pApplication);
+    return hr;
+}
diff --git a/src/api/burn/test/BalUtilUnitTest/packages.config b/src/api/burn/test/BalUtilUnitTest/packages.config
new file mode 100644
index 00000000..6d381fbe
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/packages.config
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<packages>
+  <package id="WixBuildTools.TestSupport" version="4.0.50" />
+  <package id="WixBuildTools.TestSupport.Native" version="4.0.50" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.141" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.72" targetFramework="native" />
+  <package id="xunit.abstractions" version="2.0.3" />
+  <package id="xunit.assert" version="2.4.1" />
+  <package id="xunit.core" version="2.4.1" />
+  <package id="xunit.extensibility.core" version="2.4.1" />
+  <package id="xunit.extensibility.execution" version="2.4.1" />
+  <package id="xunit.runner.msbuild" version="2.4.1" />
+  <package id="xunit.runner.visualstudio" version="2.4.1" />
+</packages>
+\ No newline at end of file
diff --git a/src/api/burn/test/BalUtilUnitTest/precomp.cpp b/src/api/burn/test/BalUtilUnitTest/precomp.cpp
new file mode 100644
index 00000000..37664a1c
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/precomp.cpp
@@ -0,0 +1,3 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
diff --git a/src/api/burn/test/BalUtilUnitTest/precomp.h b/src/api/burn/test/BalUtilUnitTest/precomp.h
new file mode 100644
index 00000000..a84391f9
--- /dev/null
+++ b/src/api/burn/test/BalUtilUnitTest/precomp.h
@@ -0,0 +1,23 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <msiquery.h>
+#include <CommCtrl.h>
+#include <dutil.h>
+#include <locutil.h>
+#include <thmutil.h>
+#include <BootstrapperEngine.h>
+#include <BootstrapperApplication.h>
+#include "IBootstrapperEngine.h"
+#include "IBootstrapperApplication.h"
+#include "balutil.h"
+#include "balretry.h"
+#include "BAFunctions.h"
+#pragma managed
+#include <vcclr.h>
diff --git a/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj b/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj
new file mode 100644
index 00000000..a9937894
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj
@@ -0,0 +1,75 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project DefaultTargets="Build" ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props" Condition="Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props')" />
+  <Import Project="..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props" Condition="Exists('..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" />
+  <ItemGroup Label="ProjectConfigurations">
+    <ProjectConfiguration Include="Debug|Win32">
+      <Configuration>Debug</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+    <ProjectConfiguration Include="Release|Win32">
+      <Configuration>Release</Configuration>
+      <Platform>Win32</Platform>
+    </ProjectConfiguration>
+  </ItemGroup>
+  <PropertyGroup Label="Globals">
+    <ProjectTypes>{3AC096D0-A1C2-E12C-1390-A8335801FDAB};{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}</ProjectTypes>
+    <ProjectGuid>{B69E6422-49B0-4E28-92F9-B8A7410A6ED9}</ProjectGuid>
+    <RootNamespace>UnitTest</RootNamespace>
+    <Keyword>ManagedCProj</Keyword>
+    <ConfigurationType>DynamicLibrary</ConfigurationType>
+    <CharacterSet>Unicode</CharacterSet>
+    <CLRSupport>true</CLRSupport>
+    <SignOutput>false</SignOutput>
+  </PropertyGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
+  <PropertyGroup>
+    <ProjectAdditionalIncludeDirectories>..\..\bextutil\inc</ProjectAdditionalIncludeDirectories>
+    <ProjectAdditionalLinkLibraries></ProjectAdditionalLinkLibraries>
+  </PropertyGroup>
+  <ItemGroup>
+    <ClCompile Include="precomp.cpp">
+      <PrecompiledHeader>Create</PrecompiledHeader>
+      <!-- Warnings from referencing netstandard dlls -->
+      <DisableSpecificWarnings>4564;4691</DisableSpecificWarnings>
+    </ClCompile>
+    <ClCompile Include="TestBundleExtension.cpp" />
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="WixBuildTools.TestSupport">
+      <HintPath>..\..\..\packages\WixBuildTools.TestSupport.4.0.50\lib\net472\WixBuildTools.TestSupport.dll</HintPath>
+    </Reference>
+    <Reference Include="WixBuildTools.TestSupport.Native">
+      <HintPath>..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\lib\net472\WixBuildTools.TestSupport.Native.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\balutil\balutil.vcxproj">
+      <Project>{06027492-1CB9-48BC-B31E-C1F9356ED07E}</Project>
+    </ProjectReference>
+  </ItemGroup>
+  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
+  <Import Project="..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets" Condition="Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets')" />
+  <Target Name="EnsureNuGetPackageBuildImports" BeforeTargets="PrepareForBuild">
+    <PropertyGroup>
+      <ErrorText>This project references NuGet package(s) that are missing on this computer. Use NuGet Package Restore to download them.  For more information, see http://go.microsoft.com/fwlink/?LinkID=322105. The missing file is {0}.</ErrorText>
+    </PropertyGroup>
+    <Error Condition="!Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixBuildTools.TestSupport.Native.4.0.50\build\WixBuildTools.TestSupport.Native.targets'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixToolset.DUtil.4.0.72\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\..\packages\WixToolset.BootstrapperCore.Native.4.0.141\build\WixToolset.BootstrapperCore.Native.props'))" />
+  </Target>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj.filters b/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj.filters
new file mode 100644
index 00000000..f1711f81
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/BextUtilUnitTest.vcxproj.filters
@@ -0,0 +1,30 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <ItemGroup>
+    <Filter Include="Source Files">
+      <UniqueIdentifier>{4FC737F1-C7A5-4376-A066-2A32D752A2FF}</UniqueIdentifier>
+      <Extensions>cpp;c;cc;cxx;def;odl;idl;hpj;bat;asm;asmx</Extensions>
+    </Filter>
+    <Filter Include="Header Files">
+      <UniqueIdentifier>{93995380-89BD-4b04-88EB-625FBE52EBFB}</UniqueIdentifier>
+      <Extensions>h;hpp;hxx;hm;inl;inc;xsd</Extensions>
+    </Filter>
+    <Filter Include="Resource Files">
+      <UniqueIdentifier>{67DA6AB6-F800-4c08-8B7A-83BB121AAD01}</UniqueIdentifier>
+      <Extensions>rc;ico;cur;bmp;dlg;rc2;rct;bin;rgs;gif;jpg;jpeg;jpe;resx;tiff;tif;png;wav</Extensions>
+    </Filter>
+  </ItemGroup>
+  <ItemGroup>
+    <ClCompile Include="precomp.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+    <ClCompile Include="TestBundleExtension.cpp">
+      <Filter>Source Files</Filter>
+    </ClCompile>
+  </ItemGroup>
+  <ItemGroup>
+    <ClInclude Include="precomp.h">
+      <Filter>Header Files</Filter>
+    </ClInclude>
+  </ItemGroup>
+</Project>
+\ No newline at end of file
diff --git a/src/api/burn/test/BextUtilUnitTest/TestBundleExtension.cpp b/src/api/burn/test/BextUtilUnitTest/TestBundleExtension.cpp
new file mode 100644
index 00000000..921303bb
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/TestBundleExtension.cpp
@@ -0,0 +1,42 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
+#include "BextBaseBundleExtension.h"
+#include "BextBaseBundleExtensionProc.h"
+class CTestBundleExtension : public CBextBaseBundleExtension
+{
+public:
+    CTestBundleExtension(
+        __in IBundleExtensionEngine* pEngine
+        ) : CBextBaseBundleExtension(pEngine)
+    {
+    }
+};
+HRESULT TestBundleExtensionCreate(
+    __in IBundleExtensionEngine* pEngine,
+    __in const BUNDLE_EXTENSION_CREATE_ARGS* pArgs,
+    __inout BUNDLE_EXTENSION_CREATE_RESULTS* pResults,
+    __out IBundleExtension** ppBundleExtension
+    )
+{
+    HRESULT hr = S_OK;
+    CTestBundleExtension* pExtension = NULL;
+    pExtension = new CTestBundleExtension(pEngine);
+    ExitOnNull(pExtension, hr, E_OUTOFMEMORY, "Failed to create new CTestBundleExtension.");
+    hr = pExtension->Initialize(pArgs);
+    ExitOnFailure(hr, "CTestBundleExtension initialization failed");
+    pResults->pfnBundleExtensionProc = BextBaseBundleExtensionProc;
+    pResults->pvBundleExtensionProcContext = pExtension;
+    *ppBundleExtension = pExtension;
+    pExtension = NULL;
+LExit:
+    ReleaseObject(pExtension);
+    return hr;
+}
diff --git a/src/api/burn/test/BextUtilUnitTest/packages.config b/src/api/burn/test/BextUtilUnitTest/packages.config
new file mode 100644
index 00000000..6d381fbe
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/packages.config
@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<packages>
+  <package id="WixBuildTools.TestSupport" version="4.0.50" />
+  <package id="WixBuildTools.TestSupport.Native" version="4.0.50" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.141" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.72" targetFramework="native" />
+  <package id="xunit.abstractions" version="2.0.3" />
+  <package id="xunit.assert" version="2.4.1" />
+  <package id="xunit.core" version="2.4.1" />
+  <package id="xunit.extensibility.core" version="2.4.1" />
+  <package id="xunit.extensibility.execution" version="2.4.1" />
+  <package id="xunit.runner.msbuild" version="2.4.1" />
+  <package id="xunit.runner.visualstudio" version="2.4.1" />
+</packages>
+\ No newline at end of file
diff --git a/src/api/burn/test/BextUtilUnitTest/precomp.cpp b/src/api/burn/test/BextUtilUnitTest/precomp.cpp
new file mode 100644
index 00000000..37664a1c
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/precomp.cpp
@@ -0,0 +1,3 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include "precomp.h"
diff --git a/src/api/burn/test/BextUtilUnitTest/precomp.h b/src/api/burn/test/BextUtilUnitTest/precomp.h
new file mode 100644
index 00000000..a6586f70
--- /dev/null
+++ b/src/api/burn/test/BextUtilUnitTest/precomp.h
@@ -0,0 +1,19 @@
+#pragma once
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+#include <windows.h>
+#include <msiquery.h>
+#include <dutil.h>
+#include <strutil.h>
+#include <BundleExtensionEngine.h>
+#include <BundleExtension.h>
+#include "IBundleExtensionEngine.h"
+#include "IBundleExtension.h"
+#include "bextutil.h"
+#pragma managed
+#include <vcclr.h>
diff --git a/src/api/burn/test/WixToolsetTest.Mba.Core/BaseBootstrapperApplicationFactoryFixture.cs b/src/api/burn/test/WixToolsetTest.Mba.Core/BaseBootstrapperApplicationFactoryFixture.cs
new file mode 100644
index 00000000..aaf5ee29
--- /dev/null
+++ b/src/api/burn/test/WixToolsetTest.Mba.Core/BaseBootstrapperApplicationFactoryFixture.cs
@@ -0,0 +1,132 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolsetTest.Mba.Core
+{
+    using System;
+    using System.Runtime.InteropServices;
+    using WixToolset.Mba.Core;
+    using Xunit;
+    public class BaseBootstrapperApplicationFactoryFixture
+    {
+        [Fact]
+        public void CanCreateBA()
+        {
+            var command = new TestCommand
+            {
+                action = LaunchAction.Install,
+                cbSize = Marshal.SizeOf(typeof(TestCommand)),
+                display = Display.Full,
+                wzCommandLine = "this \"is a\" test",
+            };
+            var pCommand = Marshal.AllocHGlobal(command.cbSize);
+            try
+            {
+                Marshal.StructureToPtr(command, pCommand, false);
+                var createArgs = new BootstrapperCreateArgs(0, IntPtr.Zero, IntPtr.Zero, pCommand);
+                var pArgs = Marshal.AllocHGlobal(createArgs.cbSize);
+                try
+                {
+                    Marshal.StructureToPtr(createArgs, pArgs, false);
+                    var createResults = new TestCreateResults
+                    {
+                        cbSize = Marshal.SizeOf<TestCreateResults>(),
+                    };
+                    var pResults = Marshal.AllocHGlobal(createResults.cbSize);
+                    try
+                    {
+                        var baFactory = new TestBAFactory();
+                        baFactory.Create(pArgs, pResults);
+                        createResults = Marshal.PtrToStructure<TestCreateResults>(pResults);
+                        Assert.Equal(baFactory.BA, createResults.pBA);
+                        Assert.Equal(baFactory.BA.Command.Action, command.action);
+                        Assert.Equal(baFactory.BA.Command.Display, command.display);
+                        Assert.Equal(baFactory.BA.Command.CommandLineArgs, new string[] { "this", "is a", "test" });
+                    }
+                    finally
+                    {
+                        Marshal.FreeHGlobal(pResults);
+                    }
+                }
+                finally
+                {
+                    Marshal.FreeHGlobal(pArgs);
+                }
+            }
+            finally
+            {
+                Marshal.FreeHGlobal(pCommand);
+            }
+        }
+        internal class TestBAFactory : BaseBootstrapperApplicationFactory
+        {
+            public TestBA BA { get; private set; }
+            protected override IBootstrapperApplication Create(IEngine engine, IBootstrapperCommand bootstrapperCommand)
+            {
+                this.BA = new TestBA(engine, bootstrapperCommand);
+                return this.BA;
+            }
+        }
+        internal class TestBA : BootstrapperApplication
+        {
+            public IBootstrapperCommand Command { get; }
+            public TestBA(IEngine engine, IBootstrapperCommand command)
+                : base(engine)
+            {
+                this.Command = command;
+            }
+            protected override void Run()
+            {
+            }
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        public struct TestCommand
+        {
+            public int cbSize;
+            public LaunchAction action;
+            public Display display;
+            public Restart restart;
+            [MarshalAs(UnmanagedType.LPWStr)] public string wzCommandLine;
+            public int nCmdShow;
+            public ResumeType resume;
+            public IntPtr hwndSplashScreen;
+            public RelationType relation;
+            [MarshalAs(UnmanagedType.Bool)] public bool passthrough;
+            [MarshalAs(UnmanagedType.LPWStr)] public string wzLayoutDirectory;
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        public struct BootstrapperCreateArgs
+        {
+            [MarshalAs(UnmanagedType.I4)] public readonly int cbSize;
+            [MarshalAs(UnmanagedType.I8)] public readonly long qwEngineAPIVersion;
+            public readonly IntPtr pfnBootstrapperEngineProc;
+            public readonly IntPtr pvBootstrapperEngineProcContext;
+            public readonly IntPtr pCommand;
+            public BootstrapperCreateArgs(long version, IntPtr pEngineProc, IntPtr pEngineContext, IntPtr pCommand)
+            {
+                this.cbSize = Marshal.SizeOf(typeof(BootstrapperCreateArgs));
+                this.qwEngineAPIVersion = version;
+                this.pfnBootstrapperEngineProc = pEngineProc;
+                this.pvBootstrapperEngineProcContext = pEngineContext;
+                this.pCommand = pCommand;
+            }
+        }
+        [StructLayout(LayoutKind.Sequential)]
+        public struct TestCreateResults
+        {
+            public int cbSize;
+            public IntPtr pBAProc;
+            [MarshalAs(UnmanagedType.Interface)] public IBootstrapperApplication pBA;
+        }
+    }
+}
diff --git a/src/api/burn/test/WixToolsetTest.Mba.Core/VerUtilFixture.cs b/src/api/burn/test/WixToolsetTest.Mba.Core/VerUtilFixture.cs
new file mode 100644
index 00000000..44142e3d
--- /dev/null
+++ b/src/api/burn/test/WixToolsetTest.Mba.Core/VerUtilFixture.cs
@@ -0,0 +1,93 @@
+// Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information.
+namespace WixToolsetTest.Mba.Core
+{
+    using System;
+    using WixToolset.Mba.Core;
+    using Xunit;
+    public class VerUtilFixture
+    {
+        [Fact]
+        public void CanCompareStringVersions()
+        {
+            var version1 = "1.2.3.4+abcd";
+            var version2 = "1.2.3.4+zyxw";
+            Assert.Equal(0, VerUtil.CompareStringVersions(version1, version2, strict: false));
+        }
+        [Fact]
+        public void CanCopyVersion()
+        {
+            var version = "1.2.3.4-5.6.7.8.9.0";
+            VerUtilVersion copiedVersion = null;
+            try
+            {
+                using (var parsedVersion = VerUtil.ParseVersion(version, strict: true))
+                {
+                    copiedVersion = VerUtil.CopyVersion(parsedVersion);
+                }
+                using (var secondVersion = VerUtil.ParseVersion(version, strict: true))
+                {
+                    Assert.Equal(0, VerUtil.CompareParsedVersions(copiedVersion, secondVersion));
+                }
+            }
+            finally
+            {
+                copiedVersion?.Dispose();
+            }
+        }
+        [Fact]
+        public void CanCreateFromQword()
+        {
+            var version = new Version(100, 200, 300, 400);
+            var qwVersion = Engine.VersionToLong(version);
+            using var parsedVersion = VerUtil.VersionFromQword(qwVersion);
+            Assert.Equal("100.200.300.400", parsedVersion.Version);
+            Assert.Equal(100u, parsedVersion.Major);
+            Assert.Equal(200u, parsedVersion.Minor);
+            Assert.Equal(300u, parsedVersion.Patch);
+            Assert.Equal(400u, parsedVersion.Revision);
+            Assert.Empty(parsedVersion.ReleaseLabels);
+            Assert.Equal("", parsedVersion.Metadata);
+            Assert.False(parsedVersion.IsInvalid);
+        }
+        [Fact]
+        public void CanParseVersion()
+        {
+            var version = "1.2.3.4-a.b.c.d.5.+abc123";
+            using var parsedVersion = VerUtil.ParseVersion(version, strict: false);
+            Assert.Equal(version, parsedVersion.Version);
+            Assert.Equal(1u, parsedVersion.Major);
+            Assert.Equal(2u, parsedVersion.Minor);
+            Assert.Equal(3u, parsedVersion.Patch);
+            Assert.Equal(4u, parsedVersion.Revision);
+            Assert.Equal(5, parsedVersion.ReleaseLabels.Length);
+            Assert.Equal("+abc123", parsedVersion.Metadata);
+            Assert.True(parsedVersion.IsInvalid);
+            Assert.Equal("a", parsedVersion.ReleaseLabels[0].Label);
+            Assert.False(parsedVersion.ReleaseLabels[0].IsNumeric);
+            Assert.Equal("b", parsedVersion.ReleaseLabels[1].Label);
+            Assert.False(parsedVersion.ReleaseLabels[1].IsNumeric);
+            Assert.Equal("c", parsedVersion.ReleaseLabels[2].Label);
+            Assert.False(parsedVersion.ReleaseLabels[2].IsNumeric);
+            Assert.Equal("d", parsedVersion.ReleaseLabels[3].Label);
+            Assert.False(parsedVersion.ReleaseLabels[3].IsNumeric);
+            Assert.Equal("5", parsedVersion.ReleaseLabels[4].Label);
+            Assert.True(parsedVersion.ReleaseLabels[4].IsNumeric);
+            Assert.Equal(5u, parsedVersion.ReleaseLabels[4].Value);
+        }
+    }
+}
diff --git a/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.csproj b/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.csproj
new file mode 100644
index 00000000..53d82f7e
--- /dev/null
+++ b/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.csproj
@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) .NET Foundation and contributors. All rights reserved. Licensed under the Microsoft Reciprocal License. See LICENSE.TXT file in the project root for full license information. -->
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <IsPackable>false</IsPackable>
+    <RuntimeIdentifier>win-x86</RuntimeIdentifier>
+    <SignOutput>false</SignOutput>
+  </PropertyGroup>
+  <ItemGroup>
+    <ProjectReference Include="..\..\WixToolset.Mba.Core\WixToolset.Mba.Core.csproj" />
+  </ItemGroup>
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.3.0" />
+    <PackageReference Include="xunit" Version="2.4.1" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.1" PrivateAssets="All" />
+  </ItemGroup>
+</Project>
diff --git a/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.v3.ncrunchproject b/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.v3.ncrunchproject
new file mode 100644
index 00000000..7b5b2139
--- /dev/null
+++ b/src/api/burn/test/WixToolsetTest.Mba.Core/WixToolsetTest.Mba.Core.v3.ncrunchproject
@@ -0,0 +1,5 @@
+<ProjectConfiguration>
+  <Settings>
+    <CopyReferencedAssembliesToWorkspace>True</CopyReferencedAssembliesToWorkspace>
+  </Settings>
+</ProjectConfiguration>
+\ No newline at end of file