47 files changed, 104 insertions, 69 deletions

diff --git a/src/setup/ThmViewerPackage/ThmViewerPackage.wxs b/src/setup/ThmViewerPackage/ThmViewerPackage.wxs
index eb399686..df398d0f 100644
--- a/src/setup/ThmViewerPackage/ThmViewerPackage.wxs
+++ b/src/setup/ThmViewerPackage/ThmViewerPackage.wxs
@@ -1,6 +1,6 @@
 <!-- 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. -->
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="WiX Toolset Theme Viewer" Manufacturer="WiX Toolset" Language="1033" Version="!(bind.fileVersion.ThmViewerFile)" UpgradeCode="59c4b122-5167-445b-8fc4-09dcd4eced89">
+  <Package Id="WixToolset.ThemeViewer.Package" Name="WiX Toolset Theme Viewer" Manufacturer="WiX Toolset" Language="1033" Version="!(bind.fileVersion.ThmViewerFile)">
     <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
 
     <Feature Id="Main">
diff --git a/src/setup/WixAdditionalTools/WixAdditionalTools.wxs b/src/setup/WixAdditionalTools/WixAdditionalTools.wxs
index 6a9f945f..9369f32e 100644
--- a/src/setup/WixAdditionalTools/WixAdditionalTools.wxs
+++ b/src/setup/WixAdditionalTools/WixAdditionalTools.wxs
@@ -2,7 +2,7 @@
 
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs"
      xmlns:bal="http://wixtoolset.org/schemas/v4/wxs/bal">
-  <Bundle Name="!(loc.Name)" Manufacturer="WiX Toolset" Version="$(SetupVersion)" UpgradeCode="fc48131d-214a-439b-9a31-ef2ea5c69ea5"
+  <Bundle Id="WixToolset.WixAdditionalTools" Name="!(loc.Name)" Manufacturer="WiX Toolset" Version="$(SetupVersion)"
           AboutUrl="!(loc.AboutUrl)" HelpUrl="!(loc.SupportUrl)" UpdateUrl="!(loc.UpdateUrl)">
     <BootstrapperApplication>
       <bal:WixStandardBootstrapperApplication
diff --git a/src/setup/wix-cli/Package.wxs b/src/setup/wix-cli/Package.wxs
index 9c193130..c777f356 100644
--- a/src/setup/wix-cli/Package.wxs
+++ b/src/setup/wix-cli/Package.wxs
@@ -1,6 +1,6 @@
 <!-- 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. -->
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="WiX Toolset Command-Line Tools" Manufacturer="WiX Toolset" Version="!(bind.fileVersion.WixExe)" UpgradeCode="2e85dc76-769f-46d2-82a7-46cb3a0c9d50">
+  <Package Id="WixToolset.CommandLineTools.Package" Name="WiX Toolset Command-Line Tools" Manufacturer="WiX Toolset" Version="!(bind.fileVersion.WixExe)">
     <MediaTemplate EmbedCab="yes" />
 
     <ComponentGroupRef Id="BinaryFiles" />
diff --git a/src/wix/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs b/src/wix/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
index 788e87b8..ebf0ae8c 100644
--- a/src/wix/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
+++ b/src/wix/WixToolset.Core.WindowsInstaller/Decompile/Decompiler.cs
@@ -6216,6 +6216,9 @@ namespace WixToolset.Core.WindowsInstaller.Decompile
                         case "Manufacturer":
                             this.DecompilerHelper.RootElement.SetAttributeValue("Manufacturer", value);
                             continue;
+                        case "PackageId":
+                            this.DecompilerHelper.RootElement.SetAttributeValue("Id", value);
+                            continue;
                         case "ProductCode":
                             this.DecompilerHelper.RootElement.SetAttributeValue("ProductCode", value.ToUpper(CultureInfo.InvariantCulture));
                             continue;
diff --git a/src/wix/WixToolset.Core/Compiler.cs b/src/wix/WixToolset.Core/Compiler.cs
index e359f3c1..b4980b07 100644
--- a/src/wix/WixToolset.Core/Compiler.cs
+++ b/src/wix/WixToolset.Core/Compiler.cs
@@ -29,6 +29,9 @@ namespace WixToolset.Core
         private const char ComponentIdPlaceholderEnd = (char)167;
         private Dictionary<string, string> componentIdPlaceholders;
 
+        // As outlined in RFC 4122, this is our namespace for generating name-based (version 3) UUIDs for upgrade codes.
+        private static readonly Guid UpgradeCodeGuidNamespace = new Guid("{D9C5E8D9-0F97-4D24-A235-91BD2FA169A6}");
+
         // If these are true you know you are building a module or product
         // but if they are false you cannot not be sure they will not end
         // up a product or module.  Use these flags carefully.
diff --git a/src/wix/WixToolset.Core/Compiler_Bundle.cs b/src/wix/WixToolset.Core/Compiler_Bundle.cs
index fcf31014..38dbd4c2 100644
--- a/src/wix/WixToolset.Core/Compiler_Bundle.cs
+++ b/src/wix/WixToolset.Core/Compiler_Bundle.cs
@@ -115,6 +115,7 @@ namespace WixToolset.Core
         private void ParseBundleElement(XElement node)
         {
             var sourceLineNumbers = Preprocessor.GetSourceLineNumbers(node);
+            Identifier id = null;
             string copyright = null;
             string aboutUrl = null;
             var modifyType = WixBundleModifyType.Allowed;
@@ -144,6 +145,9 @@ namespace WixToolset.Core
                 {
                     switch (attrib.Name.LocalName)
                     {
+                        case "Id":
+                            id = this.Core.GetAttributeIdentifier(sourceLineNumbers, attrib);
+                            break;
                         case "AboutUrl":
                             aboutUrl = this.Core.GetAttributeValue(sourceLineNumbers, attrib);
                             break;
@@ -233,7 +237,14 @@ namespace WixToolset.Core
 
             if (String.IsNullOrEmpty(upgradeCode))
             {
-                this.Core.Write(ErrorMessages.ExpectedAttribute(sourceLineNumbers, node.Name.LocalName, "UpgradeCode"));
+                if (id is null)
+                {
+                    this.Core.Write(ErrorMessages.ExpectedAttributes(sourceLineNumbers, node.Name.LocalName, "Id", "UpgradeCode"));
+                }
+                else
+                {
+                    upgradeCode = this.Core.CreateGuid(Compiler.UpgradeCodeGuidNamespace, id.Id);
+                }
             }
 
             if (String.IsNullOrEmpty(copyright))
@@ -265,7 +276,7 @@ namespace WixToolset.Core
                 logVariablePrefixAndExtension = String.Concat("WixBundleLog:", fileSystemSafeBundleName, ":log");
             }
 
-            this.activeName = String.IsNullOrEmpty(name) ? Common.GenerateGuid() : name;
+            this.activeName = String.IsNullOrEmpty(name) ? String.IsNullOrEmpty(id?.Id) ? Common.GenerateGuid() : id.Id : name;
             this.Core.CreateActiveSection(this.activeName, SectionType.Bundle, this.Context.CompilationId);
 
             // Now that the active section is initialized, process only extension attributes and the special ProviderKey attribute.
@@ -401,7 +412,7 @@ namespace WixToolset.Core
 
             if (!this.Core.EncounteredError)
             {
-                var symbol = this.Core.AddSymbol(new WixBundleSymbol(sourceLineNumbers)
+                var symbol = this.Core.AddSymbol(new WixBundleSymbol(sourceLineNumbers, id)
                 {
                     UpgradeCode = upgradeCode,
                     Version = version,
diff --git a/src/wix/WixToolset.Core/Compiler_Package.cs b/src/wix/WixToolset.Core/Compiler_Package.cs
index b84c5fae..466c87a3 100644
--- a/src/wix/WixToolset.Core/Compiler_Package.cs
+++ b/src/wix/WixToolset.Core/Compiler_Package.cs
@@ -25,6 +25,7 @@ namespace WixToolset.Core
         private void ParsePackageElement(XElement node)
         {
             var sourceLineNumbers = Preprocessor.GetSourceLineNumbers(node);
+            Identifier id = null;
             var compressed = YesNoDefaultType.Default;
             var sourceBits = 0;
             string codepage = null;
@@ -53,6 +54,9 @@ namespace WixToolset.Core
                 {
                     switch (attrib.Name.LocalName)
                     {
+                    case "Id":
+                        id = this.Core.GetAttributeIdentifier(sourceLineNumbers, attrib);
+                        break;
                     case "Codepage":
                         codepage = this.Core.GetAttributeLocalizableCodePageValue(sourceLineNumbers, attrib);
                         break;
@@ -156,7 +160,14 @@ namespace WixToolset.Core
 
             if (null == upgradeCode)
             {
-                this.Core.Write(WarningMessages.MissingUpgradeCode(sourceLineNumbers));
+                if (id is null)
+                {
+                    this.Core.Write(WarningMessages.MissingUpgradeCode(sourceLineNumbers));
+                }
+                else
+                {
+                    upgradeCode = this.Core.CreateGuid(Compiler.UpgradeCodeGuidNamespace, id.Id);
+                }
             }
 
             if (null == version)
@@ -179,6 +190,11 @@ namespace WixToolset.Core
                 this.compilingProduct = true;
                 this.Core.CreateActiveSection(productCode, SectionType.Package, this.Context.CompilationId);
 
+                if (null != id)
+                {
+                    this.AddProperty(sourceLineNumbers, new Identifier(AccessModifier.Global, "PackageId"), id.Id, false, false, false, true);
+                }
+
                 this.AddProperty(sourceLineNumbers, new Identifier(AccessModifier.Global, "Manufacturer"), manufacturer, false, false, false, true);
                 this.AddProperty(sourceLineNumbers, new Identifier(AccessModifier.Global, "ProductCode"), productCode, false, false, false, true);
                 this.AddProperty(sourceLineNumbers, new Identifier(AccessModifier.Global, "ProductLanguage"), productLanguage, false, false, false, true);
@@ -392,7 +408,7 @@ namespace WixToolset.Core
 
                 if (!this.Core.EncounteredError)
                 {
-                    this.Core.AddSymbol(new WixPackageSymbol(sourceLineNumbers)
+                    this.Core.AddSymbol(new WixPackageSymbol(sourceLineNumbers, id)
                     {
                         PackageId = productCode,
                         UpgradeCode = upgradeCode,
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/BundlePackageFixture.cs b/src/wix/test/WixToolsetTest.CoreIntegration/BundlePackageFixture.cs
index e4ac2dd6..ce5ad17c 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/BundlePackageFixture.cs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/BundlePackageFixture.cs
@@ -386,7 +386,7 @@ namespace WixToolsetTest.CoreIntegration
                 var packageElements = extractResult.GetBADataTestXmlLines("/ba:BootstrapperApplicationData/ba:WixPackageProperties", ignoreAttributesByElementName);
                 WixAssert.CompareLineByLine(new[]
                 {
-                    "<WixPackageProperties Package='test.msi' Vital='yes' DisplayName='All Users Package' DownloadSize='*' PackageSize='*' InstalledSize='28' PackageType='Msi' Permanent='no' LogPathVariable='WixBundleLog_test.msi' RollbackLogPathVariable='WixBundleRollbackLog_test.msi' Compressed='no' ProductCode='{33333333-3333-3333-3333-333333333333}' UpgradeCode='{4BE34BEE-CA23-488E-96A0-B15878E3654B}' Version='1.0' Cache='keep' />",
+                    "<WixPackageProperties Package='test.msi' Vital='yes' DisplayName='All Users Package' DownloadSize='*' PackageSize='*' InstalledSize='28' PackageType='Msi' Permanent='no' LogPathVariable='WixBundleLog_test.msi' RollbackLogPathVariable='WixBundleRollbackLog_test.msi' Compressed='no' ProductCode='{33333333-3333-3333-3333-333333333333}' UpgradeCode='{C00D7E9A-1276-51ED-B782-A20AB34D4070}' Version='1.0' Cache='keep' />",
                 }, packageElements);
             }
         }
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/ContainerFixture.cs b/src/wix/test/WixToolsetTest.CoreIntegration/ContainerFixture.cs
index f0495853..37035664 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/ContainerFixture.cs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/ContainerFixture.cs
@@ -149,21 +149,21 @@ namespace WixToolsetTest.CoreIntegration
                 var msiPackages = extractResult.GetManifestTestXmlLines("/burn:BurnManifest/burn:Chain/burn:MsiPackage", ignoreAttributes);
                 WixAssert.CompareLineByLine(new[]
                 {
-                    "<MsiPackage Id='FirstX86.msi' Cache='keep' CacheId='*' InstallSize='*' Size='*' PerMachine='yes' Permanent='no' Vital='yes' RollbackBoundaryForward='WixDefaultBoundary' LogPathVariable='WixBundleLog_FirstX86.msi' RollbackLogPathVariable='WixBundleRollbackLog_FirstX86.msi' ProductCode='*' Language='1033' Version='1.0.0.0' UpgradeCode='{12E4699F-E774-4D05-8A01-5BDD41BBA127}'>" +
+                    "<MsiPackage Id='FirstX86.msi' Cache='keep' CacheId='*' InstallSize='*' Size='*' PerMachine='yes' Permanent='no' Vital='yes' RollbackBoundaryForward='WixDefaultBoundary' LogPathVariable='WixBundleLog_FirstX86.msi' RollbackLogPathVariable='WixBundleRollbackLog_FirstX86.msi' ProductCode='*' Language='1033' Version='1.0.0.0' UpgradeCode='{C00D7E9A-1276-51ED-B782-A20AB34D4070}'>" +
                       "<MsiProperty Id='MSIFASTINSTALL' Value='1' />" +
                       "<MsiProperty Id='ARPSYSTEMCOMPONENT' Value='1' />" +
                      $"<Provides Key='{GetProductCodeFromMsiPdb(pdbPaths[0])}_v1.0.0.0' Version='1.0.0.0' DisplayName='MsiPackage' />" +
-                      "<RelatedPackage Id='{12E4699F-E774-4D05-8A01-5BDD41BBA127}' MaxVersion='1.0.0.0' MaxInclusive='no' OnlyDetect='no' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
-                      "<RelatedPackage Id='{12E4699F-E774-4D05-8A01-5BDD41BBA127}' MinVersion='1.0.0.0' MinInclusive='no' OnlyDetect='yes' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
+                      "<RelatedPackage Id='{C00D7E9A-1276-51ED-B782-A20AB34D4070}' MaxVersion='1.0.0.0' MaxInclusive='no' OnlyDetect='no' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
+                      "<RelatedPackage Id='{C00D7E9A-1276-51ED-B782-A20AB34D4070}' MinVersion='1.0.0.0' MinInclusive='no' OnlyDetect='yes' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
                       "<PayloadRef Id='FirstX86.msi' />" +
                       "<PayloadRef Id='fk1m38Cf9RZ2Bx_ipinRY6BftelU' />" +
                     "</MsiPackage>",
-                    "<MsiPackage Id='FirstX64.msi' Cache='keep' CacheId='*' InstallSize='*' Size='*' PerMachine='yes' Permanent='no' Vital='yes' RollbackBoundaryBackward='WixDefaultBoundary' LogPathVariable='WixBundleLog_FirstX64.msi' RollbackLogPathVariable='WixBundleRollbackLog_FirstX64.msi' ProductCode='*' Language='1033' Version='1.0.0.0' UpgradeCode='{12E4699F-E774-4D05-8A01-5BDD41BBA127}'>" +
+                    "<MsiPackage Id='FirstX64.msi' Cache='keep' CacheId='*' InstallSize='*' Size='*' PerMachine='yes' Permanent='no' Vital='yes' RollbackBoundaryBackward='WixDefaultBoundary' LogPathVariable='WixBundleLog_FirstX64.msi' RollbackLogPathVariable='WixBundleRollbackLog_FirstX64.msi' ProductCode='*' Language='1033' Version='1.0.0.0' UpgradeCode='{C00D7E9A-1276-51ED-B782-A20AB34D4070}'>" +
                       "<MsiProperty Id='ARPSYSTEMCOMPONENT' Value='1' />" +
                       "<MsiProperty Id='MSIFASTINSTALL' Value='7' />" +
                      $"<Provides Key='{GetProductCodeFromMsiPdb(pdbPaths[1])}_v1.0.0.0' Version='1.0.0.0' DisplayName='MsiPackage' />" +
-                      "<RelatedPackage Id='{12E4699F-E774-4D05-8A01-5BDD41BBA127}' MaxVersion='1.0.0.0' MaxInclusive='no' OnlyDetect='no' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
-                      "<RelatedPackage Id='{12E4699F-E774-4D05-8A01-5BDD41BBA127}' MinVersion='1.0.0.0' MinInclusive='no' OnlyDetect='yes' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
+                      "<RelatedPackage Id='{C00D7E9A-1276-51ED-B782-A20AB34D4070}' MaxVersion='1.0.0.0' MaxInclusive='no' OnlyDetect='no' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
+                      "<RelatedPackage Id='{C00D7E9A-1276-51ED-B782-A20AB34D4070}' MinVersion='1.0.0.0' MinInclusive='no' OnlyDetect='yes' LangInclusive='yes'><Language Id='1033' /></RelatedPackage>" +
                       "<PayloadRef Id='FirstX64.msi' />" +
                       "<PayloadRef Id='fC0n41rZK8oW3JK8LzHu6AT3CjdQ' />" +
                     "</MsiPackage>",
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/MsiQueryFixture.cs b/src/wix/test/WixToolsetTest.CoreIntegration/MsiQueryFixture.cs
index d1025971..647f5b24 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/MsiQueryFixture.cs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/MsiQueryFixture.cs
@@ -2,12 +2,10 @@
 
 namespace WixToolsetTest.CoreIntegration
 {
-    using System;
     using System.IO;
     using System.Linq;
-    using Example.Extension;
-    using WixInternal.TestSupport;
     using WixInternal.Core.TestPackage;
+    using WixInternal.TestSupport;
     using Xunit;
 
     public class MsiQueryFixture
@@ -929,16 +927,20 @@ namespace WixToolsetTest.CoreIntegration
                 result.AssertSuccess();
 
                 Assert.True(File.Exists(msiPath));
-                var results = Query.QueryDatabase(msiPath, new[] { "Upgrade" });
+                var results = Query.QueryDatabase(msiPath, new[] { "Property", "Upgrade" });
+                var upgradeRows = results.Where(r => r.StartsWith("Upgrade:")).OrderBy(s => s).ToArray();
                 WixAssert.CompareLineByLine(new[]
                 {
-                    "Upgrade:{12E4699F-E774-4D05-8A01-5BDD41BBA127}\t\t1.0.0.0\t1033\t1\t\tWIX_UPGRADE_DETECTED",
-                    "Upgrade:{12E4699F-E774-4D05-8A01-5BDD41BBA127}\t1.0.0.0\t\t1033\t2\t\tWIX_DOWNGRADE_DETECTED",
                     "Upgrade:{B05772EA-82B8-4DE0-B7EB-45B5F0CCFE6D}\t1.0.0\t\t\t256\t\tRELPRODFOUND",
-                }, results);
+                    "Upgrade:{C00D7E9A-1276-51ED-B782-A20AB34D4070}\t\t1.0.0.0\t1033\t1\t\tWIX_UPGRADE_DETECTED",
+                    "Upgrade:{C00D7E9A-1276-51ED-B782-A20AB34D4070}\t1.0.0.0\t\t1033\t2\t\tWIX_DOWNGRADE_DETECTED",
+                }, upgradeRows);
+
+                var packageId = results.Where(r => r.StartsWith("Property:PackageId\t")).Single();
+                Assert.Equal("Property:PackageId\tWixToolsetTest.TestPackage", packageId);
 
                 var prefix = "Property:SecureCustomProperties\t";
-                var secureProperties = Query.QueryDatabase(msiPath, new[] { "Property" }).Where(p => p.StartsWith(prefix)).Single();
+                var secureProperties = results.Where(p => p.StartsWith(prefix)).Single();
                 WixAssert.CompareLineByLine(new[]
                 {
                     "RELPRODFOUND",
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicateCrossFragmentReference.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicateCrossFragmentReference.wxs
index 73678cb6..9fb95d3a 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicateCrossFragmentReference.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicateCrossFragmentReference.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Duplicate Cross Fragment Reference" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.Duplicate.Cross.Fragment.Reference" Name="Duplicate Cross Fragment Reference" Version="1.0.0.0" Manufacturer="Example Corporation">
         <DirectoryRef Id="TestFolder" />
     </Package>
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatePublicOverrideVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatePublicOverrideVirtualSymbol.wxs
index 7ecf4445..565c94f4 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatePublicOverrideVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatePublicOverrideVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.DuplicatedOverrideVirtualSymbol" Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
 
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="override TestFolder" Name="Override Test Folder" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedOverrideVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedOverrideVirtualSymbol.wxs
index 334b01ca..d96693f7 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedOverrideVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedOverrideVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.DuplicatedOverrideVirtualSymbol" Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
 
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="override TestFolder" Name="Override Test Folder" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedVirtualSymbol.wxs
index e97d0b57..35a52a1b 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/DuplicatedVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.DuplicatedOverrideVirtualSymbol" Name="Duplicated Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
 
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="virtual TestFolder" Name="First Virtual Test Folder" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/HasVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/HasVirtualSymbol.wxs
index 5cdedf04..16bf27ff 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/HasVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/HasVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Has Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.HasVirtualSymbol" Name="Has Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="virtual TestFolder" Name="Test Folder" />
         </StandardDirectory>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/InvalidCrossFragmentReference.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/InvalidCrossFragmentReference.wxs
index 5ba21fb2..b082b0cb 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/InvalidCrossFragmentReference.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/InvalidCrossFragmentReference.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Invalid Cross Fragment Reference" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.InvalidCrossFragmentReference" Name="Invalid Cross Fragment Reference" Version="1.0.0.0" Manufacturer="Example Corporation">
         <DirectoryRef Id="Foo" />
     </Package>
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbol.wxs
index 4f4cfc16..52d9c1cc 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.OverrideVirtualSymbol" Name="Override Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
 
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="override TestFolder" Name="Override Test Folder" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbolWithFragments.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbolWithFragments.wxs
index 9afec003..9c7c638f 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbolWithFragments.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideVirtualSymbolWithFragments.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Override Virtual Symbol With Fragments" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.OverrideVirtualSymbolWithFragments" Name="Override Virtual Symbol With Fragments" Version="1.0.0.0" Manufacturer="Example Corporation">
         <DirectoryRef Id="TestFolder" />
 
         <PropertyRef Id="A" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideWithoutVirtualSymbol.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideWithoutVirtualSymbol.wxs
index 1cb749a7..31f29fd9 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideWithoutVirtualSymbol.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/OverrideWithoutVirtualSymbol.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.OverrideWithoutVirtualSymbol" Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="override TestFolder" Name="Override Without Virtual Test Folder" />
         </StandardDirectory>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolOverridden.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolOverridden.wxs
index 98e96766..b90febc5 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolOverridden.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolOverridden.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Virtual Symbol Overridden" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.TestPackage" Name="Virtual Symbol Overridden" Version="1.0.0.0" Manufacturer="Example Corporation">
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="virtual TestFolder" Name="Test Folder" />
         </StandardDirectory>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolThatDoesNotGetOverridden.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolThatDoesNotGetOverridden.wxs
index 123b856d..dd45b873 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolThatDoesNotGetOverridden.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolThatDoesNotGetOverridden.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.TestPackage" Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
         <PropertyRef Id="DoesGetReferenced" />
     </Package>
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolWithoutOverride.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolWithoutOverride.wxs
index 3db854f5..16da75d2 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolWithoutOverride.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AccessModifier/VirtualSymbolWithoutOverride.wxs
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+    <Package Id="WixToolsetTest.TestPackage" Name="Override Without Virtual Symbol" Version="1.0.0.0" Manufacturer="Example Corporation">
         <StandardDirectory Id="ProgramFilesFolder">
             <Directory Id="virtual TestFolder" Name="Test Folder" />
         </StandardDirectory>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerMachine.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerMachine.wxs
index ee243815..71ead52a 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerMachine.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerMachine.wxs
@@ -1,8 +1,8 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Version="1"
+  <Package Id="WixToolsetTest.TestPackage"
+           Version="1"
            Name="MsiPackage"
            Manufacturer="Example Corporation"
-           UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a"
            Scope="perMachine">
     <MajorUpgrade DowngradeErrorMessage="Downgrade not allowed" />
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUser.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUser.wxs
index cc8f7bcd..4657e819 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUser.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUser.wxs
@@ -1,8 +1,8 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Version="1"
+  <Package Id="WixToolsetTest.TestPackage"
+           Version="1"
            Name="MsiPackage"
            Manufacturer="Example Corporation"
-           UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a"
            Scope="perUser">
     <MajorUpgrade DowngradeErrorMessage="Downgrade not allowed" />
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUserOrMachine.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUserOrMachine.wxs
index 19c2cb6e..bf2e9d44 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUserOrMachine.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AllUsers/PerUserOrMachine.wxs
@@ -1,8 +1,8 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Version="1"
+  <Package Id="WixToolsetTest.TestPackage"
+           Version="1"
            Name="MsiPackage"
            Manufacturer="Example Corporation"
-           UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a"
            Scope="perUserOrMachine">
     <MajorUpgrade DowngradeErrorMessage="Downgrade not allowed" />
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AppId/TopLevelAppId.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AppId/TopLevelAppId.wxs
index 25c0f176..ae2c1501 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AppId/TopLevelAppId.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/AppId/TopLevelAppId.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="~AppId Top-Level" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="12E4699F-E774-4D05-8A01-5BDD41BBA127" Compressed="no">
+    <Package Id="WixToolsetTest.TestPackage" Name="~AppId Top-Level" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no">
         <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
 
         <AppId Id="D6040299-B15C-4C94-AE26-0C9B60D14C35" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly/Package.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly/Package.wxs
index c345305d..77d8515f 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly/Package.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="AssemblyMsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="no" InstallerVersion="200" Scope="perMachine">
+  <Package Id="WixToolsetTest.TestPackage" Name="AssemblyMsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no" InstallerVersion="200" Scope="perMachine">
     
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly1x/Package.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly1x/Package.wxs
index c345305d..77d8515f 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly1x/Package.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Assembly1x/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="AssemblyMsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="no" InstallerVersion="200" Scope="perMachine">
+  <Package Id="WixToolsetTest.TestPackage" Name="AssemblyMsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no" InstallerVersion="200" Scope="perMachine">
     
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BadIf/Package.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BadIf/Package.wxs
index 1d7ebb94..48bc4841 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BadIf/Package.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BadIf/Package.wxs
@@ -1,5 +1,5 @@
-<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Language="1033" Version="1.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="no" InstallerVersion="200" Scope="perMachine">
+<Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Language="1033" Version="1.0" Manufacturer="Example Corporation" Compressed="no" InstallerVersion="200" Scope="perMachine">
     
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BindVariables/PackageWithBindVariables.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BindVariables/PackageWithBindVariables.wxs
index 2a0c374f..291423ee 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BindVariables/PackageWithBindVariables.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BindVariables/PackageWithBindVariables.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="PacakgeWithBindVariables" Version="!(bind.fileversion.TestBinaryFile)" Manufacturer="Example Corporation" UpgradeCode="41a2c17e-1976-465b-bcde-eae03516ca68">
+  <Package Id="WixToolsetTest.TestPackage" Name="PacakgeWithBindVariables" Version="!(bind.fileversion.TestBinaryFile)" Manufacturer="Example Corporation">
 
     <Property Id="TestPackageManufacturer" Value="!(bind.Property.Manufacturer)" />
     <Property Id="TestPackageName" Value="!(bind.Property.ProductName)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BundleAllUsers/AllUsersPackage.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BundleAllUsers/AllUsersPackage.wxs
index 63046563..1fd61a57 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BundleAllUsers/AllUsersPackage.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/BundleAllUsers/AllUsersPackage.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package ProductCode="33333333-3333-3333-3333-333333333333" Name="All Users Package" Version="1.0" Manufacturer="Example Corporation" UpgradeCode="4BE34BEE-CA23-488E-96A0-B15878E3654B" Compressed="no" Scope="perUserOrMachine">
+  <Package Id="WixToolsetTest.TestPackage" ProductCode="33333333-3333-3333-3333-333333333333" Name="All Users Package" Version="1.0" Manufacturer="Example Corporation" Compressed="no" Scope="perUserOrMachine">
 
     <StandardDirectory Id="ProgramFilesFolder">
         <Directory Id="INSTALLFOLDER" Name="Example" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageCustom.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageCustom.wxs
index 384e3545..893e6c29 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageCustom.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageCustom.wxs
@@ -1,8 +1,8 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Version="1"
+  <Package Id="WixToolsetTest.TestPackage"
+           Version="1"
            Name="MsiPackage"
-           Manufacturer="Example Corporation"
-           UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+           Manufacturer="Example Corporation">
     <MajorUpgrade DowngradeErrorMessage="Downgrade not allowed" />
     <SummaryInformation Comments="Example comments" />
   </Package>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageDefault.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageDefault.wxs
index 655a17e0..1390e95c 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageDefault.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Comments/PackageDefault.wxs
@@ -1,8 +1,8 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Version="1"
+  <Package Id="WixToolsetTest.TestPackage"
+           Version="1"
            Name="MsiPackage"
-           Manufacturer="Example Corporation"
-           UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a">
+           Manufacturer="Example Corporation">
     <MajorUpgrade DowngradeErrorMessage="Downgrade not allowed" />
     <SummaryInformation />
   </Package>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ComplexExampleExtension/Package.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ComplexExampleExtension/Package.wxs
index db07af2c..c01bb82b 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ComplexExampleExtension/Package.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ComplexExampleExtension/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="no" InstallerVersion="200" Scope="perMachine">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no" InstallerVersion="200" Scope="perMachine">
     
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Components/Package.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Components/Package.wxs
index d7b5bdc0..d0bb5436 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Components/Package.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Components/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Codepage="1252" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="no" InstallerVersion="200" Scope="perMachine">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Codepage="1252" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no" InstallerVersion="200" Scope="perMachine">
     
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/CustomTable/CustomTable-Expected.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/CustomTable/CustomTable-Expected.wxs
index fdcc3438..f377a06e 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/CustomTable/CustomTable-Expected.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/CustomTable/CustomTable-Expected.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Codepage="1252" Language="1033" Manufacturer="Example Corporation" Name="MsiPackage" UpgradeCode="{12E4699F-E774-4D05-8A01-5BDD41BBA127}" Version="1.0.0.0" ProductCode="{83F9C623-26FE-42AB-951E-170022117F54}" Compressed="no">
+  <Package Codepage="1252" Id="WixToolsetTest.TestPackage" Language="1033" Manufacturer="Example Corporation" Name="MsiPackage" UpgradeCode="{C00D7E9A-1276-51ED-B782-A20AB34D4070}" Version="1.0.0.0" ProductCode="{83F9C623-26FE-42AB-951E-170022117F54}" Compressed="no">
     <CustomTable Id="CustomTable1">
       <Column Id="Column1" PrimaryKey="yes" Type="string" Width="0" Category="text" Description="The first custom column." />
       <Column Id="Component_" Type="string" Width="72" KeyTable="Component" KeyColumn="1" Description="The custom table's Component reference" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgrade/DefaultMajorUpgrade.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgrade/DefaultMajorUpgrade.wxs
index 95ebcd94..098d809e 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgrade/DefaultMajorUpgrade.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgrade/DefaultMajorUpgrade.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="MajorUpgradeDowngradeMessage" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" UpgradeCode="7ab24276-c628-43db-9e65-a184d052909b" Scope="perMachine">
+    <Package Id="WixToolsetTest.TestPackage" Name="MajorUpgradeDowngradeMessage" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" Scope="perMachine">
 
         <Property Id="PRODUCT">
             <ProductSearch UpgradeCode="{46649344-6CDF-4531-B91C-DCC088CBF6D3}" Minimum="1.0" />
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeNone/DefaultMajorUpgradeNone.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeNone/DefaultMajorUpgradeNone.wxs
index 63ff178b..63fea0f4 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeNone/DefaultMajorUpgradeNone.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeNone/DefaultMajorUpgradeNone.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="MajorUpgradeDowngradeMessage" UpgradeStrategy="none" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" UpgradeCode="7ab24276-c628-43db-9e65-a184d052909b" Scope="perMachine">
+    <Package Id="WixToolsetTest.TestPackage" Name="MajorUpgradeDowngradeMessage" UpgradeStrategy="none" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" Scope="perMachine">
         <Feature Id="ProductFeature" Title="MsiPackageTitle">
         </Feature>
     </Package>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeOverride/DefaultMajorUpgrade.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeOverride/DefaultMajorUpgrade.wxs
index ce9fd96f..5415dfcb 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeOverride/DefaultMajorUpgrade.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeOverride/DefaultMajorUpgrade.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="MajorUpgradeDowngradeMessage" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" UpgradeCode="7ab24276-c628-43db-9e65-a184d052909b" Scope="perMachine">
+    <Package Id="WixToolsetTest.TestPackage" Name="MajorUpgradeDowngradeMessage" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" Scope="perMachine">
         <Feature Id="ProductFeature" Title="MsiPackageTitle">
         </Feature>
     </Package>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeReschedule/DefaultMajorUpgradeReschedule.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeReschedule/DefaultMajorUpgradeReschedule.wxs
index 3269106b..c7b9cc3c 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeReschedule/DefaultMajorUpgradeReschedule.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/DefaultMajorUpgradeReschedule/DefaultMajorUpgradeReschedule.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="DefaultMajorUpgradeReschedule" Language="1033" Version="2.0.0" Manufacturer="Example Corporation" UpgradeCode="{3F2494B1-AF5E-48ED-9C9E-843F1DB2BC97}">
+    <Package Id="WixToolsetTest.TestPackage" Name="DefaultMajorUpgradeReschedule" Language="1033" Version="2.0.0" Manufacturer="Example Corporation">
         <InstallExecuteSequence>
             <RemoveExistingProducts After="InstallFinalize" />
         </InstallExecuteSequence>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Directory/RedundantSubdirectoryInSecondSection.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Directory/RedundantSubdirectoryInSecondSection.wxs
index fc73ee47..67d913a7 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Directory/RedundantSubdirectoryInSecondSection.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Directory/RedundantSubdirectoryInSecondSection.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="~RedundantSubdirectories" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="12E4699F-E774-4D05-8A01-5BDD41BBA127" Compressed="no">
+    <Package Id="WixToolsetTest.TestPackage" Name="~RedundantSubdirectories" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no">
         <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
 
         <Feature Id="ProductFeature">
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Encoding/Encoding.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Encoding/Encoding.wxs
index 94ca33b3..100fe4b8 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Encoding/Encoding.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/Encoding/Encoding.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-    <Package Name="Ć Not In 1252 Codepage" Version="3.0.0" Codepage="1252" Manufacturer="Example Company" Language="1033" UpgradeCode="11111111-1111-1111-1111-111111111111">
+    <Package Id="WixToolsetTest.TestPackage" Name="Ć Not In 1252 Codepage" Version="3.0.0" Codepage="1252" Manufacturer="Example Company" Language="1033">
         <StandardDirectory Id="ProgramFiles6432Folder">
             <Directory Id="INSTALLFOLDER" Name="test">
             </Directory>
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ProductWithComponentGroupRef/Product.wxs b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ProductWithComponentGroupRef/Product.wxs
index 433be7f0..a7dd7f1b 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ProductWithComponentGroupRef/Product.wxs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/TestData/ProductWithComponentGroupRef/Product.wxs
@@ -2,7 +2,7 @@
     <?ifndef ProductCode?>
     <?define ProductCode = *?>
     <?endif?>
-    <Package Name="MsiPackage" Codepage="1252" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="12E4699F-E774-4D05-8A01-5BDD41BBA127" Compressed="no" Scope="perMachine" ProductCode="$(var.ProductCode)">
+    <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Codepage="1252" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="no" Scope="perMachine" ProductCode="$(var.ProductCode)">
 
         <MajorUpgrade DowngradeErrorMessage="A newer version of [ProductName] is already installed." />
 
diff --git a/src/wix/test/WixToolsetTest.CoreIntegration/UpgradeFixture.cs b/src/wix/test/WixToolsetTest.CoreIntegration/UpgradeFixture.cs
index 49c83c07..e17b9b95 100644
--- a/src/wix/test/WixToolsetTest.CoreIntegration/UpgradeFixture.cs
+++ b/src/wix/test/WixToolsetTest.CoreIntegration/UpgradeFixture.cs
@@ -69,8 +69,8 @@ namespace WixToolsetTest.CoreIntegration
             {
                 "LaunchCondition:NOT WIX_DOWNGRADE_DETECTED\tA newer version of [ProductName] is already installed.",
                 "Upgrade:{46649344-6CDF-4531-B91C-DCC088CBF6D3}\t1.0\t\t\t258\t\tPRODUCT",
-                "Upgrade:{7AB24276-C628-43DB-9E65-A184D052909B}\t\t2.0.0\t1033\t1\t\tWIX_UPGRADE_DETECTED",
-                "Upgrade:{7AB24276-C628-43DB-9E65-A184D052909B}\t2.0.0\t\t1033\t2\t\tWIX_DOWNGRADE_DETECTED",
+                "Upgrade:{C00D7E9A-1276-51ED-B782-A20AB34D4070}\t\t2.0.0\t1033\t1\t\tWIX_UPGRADE_DETECTED",
+                "Upgrade:{C00D7E9A-1276-51ED-B782-A20AB34D4070}\t2.0.0\t\t1033\t2\t\tWIX_DOWNGRADE_DETECTED",
             }, results);
         }
 
diff --git a/src/wix/test/WixToolsetTest.Sdk/TestData/SimpleMsiPackage/MsiPackage/Package.wxs b/src/wix/test/WixToolsetTest.Sdk/TestData/SimpleMsiPackage/MsiPackage/Package.wxs
index 30be1ace..2f1e7b9c 100644
--- a/src/wix/test/WixToolsetTest.Sdk/TestData/SimpleMsiPackage/MsiPackage/Package.wxs
+++ b/src/wix/test/WixToolsetTest.Sdk/TestData/SimpleMsiPackage/MsiPackage/Package.wxs
@@ -2,7 +2,7 @@
 <?define Variable = "DifferentValue" ?>
 
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="yes" InstallerVersion="200">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="yes" InstallerVersion="200">
 
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
 
diff --git a/src/wix/test/WixToolsetTest.Sdk/TestData/SingleCultureWithFallbackMsiPackage/Package.wxs b/src/wix/test/WixToolsetTest.Sdk/TestData/SingleCultureWithFallbackMsiPackage/Package.wxs
index df24aa33..577fbd56 100644
--- a/src/wix/test/WixToolsetTest.Sdk/TestData/SingleCultureWithFallbackMsiPackage/Package.wxs
+++ b/src/wix/test/WixToolsetTest.Sdk/TestData/SingleCultureWithFallbackMsiPackage/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="yes" InstallerVersion="200">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="yes" InstallerVersion="200">
     <MajorUpgrade DowngradeErrorMessage="!(loc.DowngradeError)" />
     <MediaTemplate />
 
diff --git a/src/wix/test/WixToolsetTest.Sdk/TestData/Wixlib/PackageIncludesWixlib/Package.wxs b/src/wix/test/WixToolsetTest.Sdk/TestData/Wixlib/PackageIncludesWixlib/Package.wxs
index fe8298bd..e4310849 100644
--- a/src/wix/test/WixToolsetTest.Sdk/TestData/Wixlib/PackageIncludesWixlib/Package.wxs
+++ b/src/wix/test/WixToolsetTest.Sdk/TestData/Wixlib/PackageIncludesWixlib/Package.wxs
@@ -1,5 +1,5 @@
 <Wix xmlns="http://wixtoolset.org/schemas/v4/wxs">
-  <Package Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" UpgradeCode="047730a5-30fe-4a62-a520-da9381b8226a" Compressed="yes" InstallerVersion="200">
+  <Package Id="WixToolsetTest.TestPackage" Name="MsiPackage" Language="1033" Version="1.0.0.0" Manufacturer="Example Corporation" Compressed="yes" InstallerVersion="200">
     <MediaTemplate />
 
     <Feature Id="ProductFeature" Title="ATitle">