WIXFEAT:6210 Change data type of versions to strings.

21 files changed, 185 insertions, 123 deletions

diff --git a/src/WixToolset.Mba.Core/BootstrapperApplication.cs b/src/WixToolset.Mba.Core/BootstrapperApplication.cs
index 9ee909dc..472c553a 100644
--- a/src/WixToolset.Mba.Core/BootstrapperApplication.cs
+++ b/src/WixToolset.Mba.Core/BootstrapperApplication.cs
@@ -1130,9 +1130,9 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnDetectForwardCompatibleBundle(string wzBundleId, RelationType relationType, string wzBundleTag, bool fPerMachine, long version, ref bool fCancel, ref bool fIgnoreBundle)
+        int IBootstrapperApplication.OnDetectForwardCompatibleBundle(string wzBundleId, RelationType relationType, string wzBundleTag, bool fPerMachine, string wzVersion, ref bool fCancel, ref bool fIgnoreBundle)
         {
-            DetectForwardCompatibleBundleEventArgs args = new DetectForwardCompatibleBundleEventArgs(wzBundleId, relationType, wzBundleTag, fPerMachine, version, fCancel, fIgnoreBundle);
+            DetectForwardCompatibleBundleEventArgs args = new DetectForwardCompatibleBundleEventArgs(wzBundleId, relationType, wzBundleTag, fPerMachine, wzVersion, fCancel, fIgnoreBundle);
             this.OnDetectForwardCompatibleBundle(args);
 
             fCancel = args.Cancel;
@@ -1150,9 +1150,9 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnDetectUpdate(string wzUpdateLocation, long dw64Size, long dw64Version, string wzTitle, string wzSummary, string wzContentType, string wzContent, ref bool fCancel, ref bool fStopProcessingUpdates)
+        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, dw64Version, wzTitle, wzSummary, wzContentType, wzContent, fCancel, fStopProcessingUpdates);
+            DetectUpdateEventArgs args = new DetectUpdateEventArgs(wzUpdateLocation, dw64Size, wzVersion, wzTitle, wzSummary, wzContentType, wzContent, fCancel, fStopProcessingUpdates);
             this.OnDetectUpdate(args);
 
             fCancel = args.Cancel;
@@ -1169,9 +1169,9 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnDetectRelatedBundle(string wzProductCode, RelationType relationType, string wzBundleTag, bool fPerMachine, long version, RelatedOperation operation, ref bool fCancel)
+        int IBootstrapperApplication.OnDetectRelatedBundle(string wzProductCode, RelationType relationType, string wzBundleTag, bool fPerMachine, string wzVersion, RelatedOperation operation, ref bool fCancel)
         {
-            DetectRelatedBundleEventArgs args = new DetectRelatedBundleEventArgs(wzProductCode, relationType, wzBundleTag, fPerMachine, version, operation, fCancel);
+            DetectRelatedBundleEventArgs args = new DetectRelatedBundleEventArgs(wzProductCode, relationType, wzBundleTag, fPerMachine, wzVersion, operation, fCancel);
             this.OnDetectRelatedBundle(args);
 
             fCancel = args.Cancel;
@@ -1187,18 +1187,18 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnDetectCompatibleMsiPackage(string wzPackageId, string wzCompatiblePackageId, long dw64CompatiblePackageVersion, ref bool fCancel)
+        int IBootstrapperApplication.OnDetectCompatibleMsiPackage(string wzPackageId, string wzCompatiblePackageId, string wzCompatiblePackageVersion, ref bool fCancel)
         {
-            DetectCompatibleMsiPackageEventArgs args = new DetectCompatibleMsiPackageEventArgs(wzPackageId, wzCompatiblePackageId, dw64CompatiblePackageVersion, fCancel);
+            DetectCompatibleMsiPackageEventArgs args = new DetectCompatibleMsiPackageEventArgs(wzPackageId, wzCompatiblePackageId, wzCompatiblePackageVersion, fCancel);
             this.OnDetectCompatibleMsiPackage(args);
 
             fCancel = args.Cancel;
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnDetectRelatedMsiPackage(string wzPackageId, string wzUpgradeCode, string wzProductCode, bool fPerMachine, long version, RelatedOperation operation, ref bool fCancel)
+        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, version, operation, fCancel);
+            DetectRelatedMsiPackageEventArgs args = new DetectRelatedMsiPackageEventArgs(wzPackageId, wzUpgradeCode, wzProductCode, fPerMachine, wzVersion, operation, fCancel);
             this.OnDetectRelatedMsiPackage(args);
 
             fCancel = args.Cancel;
@@ -1268,9 +1268,9 @@ namespace WixToolset.Mba.Core
             return args.HResult;
         }
 
-        int IBootstrapperApplication.OnPlanCompatibleMsiPackageBegin(string wzPackageId, string wzCompatiblePackageId, long dw64CompatiblePackageVersion, RequestState recommendedState, ref RequestState pRequestedState, ref bool fCancel)
+        int IBootstrapperApplication.OnPlanCompatibleMsiPackageBegin(string wzPackageId, string wzCompatiblePackageId, string wzCompatiblePackageVersion, RequestState recommendedState, ref RequestState pRequestedState, ref bool fCancel)
         {
-            PlanCompatibleMsiPackageBeginEventArgs args = new PlanCompatibleMsiPackageBeginEventArgs(wzPackageId, wzCompatiblePackageId, dw64CompatiblePackageVersion, recommendedState, pRequestedState, fCancel);
+            PlanCompatibleMsiPackageBeginEventArgs args = new PlanCompatibleMsiPackageBeginEventArgs(wzPackageId, wzCompatiblePackageId, wzCompatiblePackageVersion, recommendedState, pRequestedState, fCancel);
             this.OnPlanCompatibleMsiPackageBegin(args);
 
             pRequestedState = args.State;
diff --git a/src/WixToolset.Mba.Core/Engine.cs b/src/WixToolset.Mba.Core/Engine.cs
index 98427cfa..e3ad097a 100644
--- a/src/WixToolset.Mba.Core/Engine.cs
+++ b/src/WixToolset.Mba.Core/Engine.cs
@@ -178,15 +178,21 @@ namespace WixToolset.Mba.Core
             }
         }
 
-        public Version GetVariableVersion(string name)
+        public string GetVariableVersion(string name)
         {
-            int ret = this.engine.GetVariableVersion(name, out long value);
-            if (NativeMethods.S_OK != ret)
+            int length;
+            IntPtr pUniString = this.getVersionVariable(name, out length);
+            try
             {
-                throw new Win32Exception(ret);
+                return Marshal.PtrToStringUni(pUniString, length);
+            }
+            finally
+            {
+                if (IntPtr.Zero != pUniString)
+                {
+                    Marshal.FreeCoTaskMem(pUniString);
+                }
             }
-
-            return LongToVersion(value);
         }
 
         public void LaunchApprovedExe(IntPtr hwndParent, string approvedExeForElevationId, string arguments)
@@ -224,12 +230,12 @@ namespace WixToolset.Mba.Core
             this.engine.SetDownloadSource(packageOrContainerId, payloadId, url, user, password);
         }
 
-        public void SetVariable(string name, long value)
+        public void SetVariableNumeric(string name, long value)
         {
             this.engine.SetVariableNumeric(name, value);
         }
 
-        public void SetVariable(string name, SecureString value, bool formatted)
+        public void SetVariableString(string name, SecureString value, bool formatted)
         {
             IntPtr pValue = Marshal.SecureStringToCoTaskMemUnicode(value);
             try
@@ -242,7 +248,7 @@ namespace WixToolset.Mba.Core
             }
         }
 
-        public void SetVariable(string name, string value, bool formatted)
+        public void SetVariableString(string name, string value, bool formatted)
         {
             IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
             try
@@ -255,10 +261,17 @@ namespace WixToolset.Mba.Core
             }
         }
 
-        public void SetVariable(string name, Version value)
+        public void SetVariableVersion(string name, string value)
         {
-            long version = VersionToLong(value);
-            this.engine.SetVariableVersion(name, version);
+            IntPtr pValue = Marshal.StringToCoTaskMemUni(value);
+            try
+            {
+                this.engine.SetVariableVersion(name, pValue);
+            }
+            finally
+            {
+                Marshal.FreeCoTaskMem(pValue);
+            }
         }
 
         public int SendEmbeddedError(int errorCode, string message, int uiHint)
@@ -330,6 +343,55 @@ namespace WixToolset.Mba.Core
         }
 
         /// <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)
+        {
+            int capacity = InitialBufferSize;
+            bool success = false;
+            IntPtr pValue = Marshal.AllocCoTaskMem(capacity * 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 * 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.
+                for (length = 0; length < capacity; ++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>
diff --git a/src/WixToolset.Mba.Core/EventArgs.cs b/src/WixToolset.Mba.Core/EventArgs.cs
index e739a853..71bd15e1 100644
--- a/src/WixToolset.Mba.Core/EventArgs.cs
+++ b/src/WixToolset.Mba.Core/EventArgs.cs
@@ -241,14 +241,14 @@ namespace WixToolset.Mba.Core
         /// <param name="version">The version of the forward compatible bundle detected.</param>
         /// <param name="cancelRecommendation">The cancel recommendation from the engine.</param>
         /// <param name="ignoreBundleRecommendation">The ignore recommendation from the engine.</param>
-        public DetectForwardCompatibleBundleEventArgs(string bundleId, RelationType relationType, string bundleTag, bool perMachine, long version, bool cancelRecommendation, bool ignoreBundleRecommendation)
+        public DetectForwardCompatibleBundleEventArgs(string bundleId, RelationType relationType, string bundleTag, bool perMachine, string version, bool cancelRecommendation, bool ignoreBundleRecommendation)
             : base(cancelRecommendation)
         {
             this.BundleId = bundleId;
             this.RelationType = relationType;
             this.BundleTag = bundleTag;
             this.PerMachine = perMachine;
-            this.Version = Engine.LongToVersion(version);
+            this.Version = version;
             this.IgnoreBundle = ignoreBundleRecommendation;
         }
 
@@ -275,7 +275,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the forward compatible bundle detected.
         /// </summary>
-        public Version Version { get; private set; }
+        public string Version { get; private set; }
 
         /// <summary>
         /// Instructs the engine whether to use the forward compatible bundle.
@@ -330,12 +330,12 @@ namespace WixToolset.Mba.Core
         /// <param name="content">The content of the updated bundle.</param>
         /// <param name="cancelRecommendation">The recommendation from the engine.</param>
         /// <param name="stopRecommendation">The recommendation from the engine.</param>
-        public DetectUpdateEventArgs(string updateLocation, long size, long version, string title, string summary, string contentType, string content, bool cancelRecommendation, bool stopRecommendation)
+        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 = Engine.LongToVersion(version);
+            this.Version = version;
             this.Title = title;
             this.Summary = summary;
             this.ContentType = contentType;
@@ -356,7 +356,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the updated bundle.
         /// </summary>
-        public Version Version { get; private set; }
+        public string Version { get; private set; }
 
         /// <summary>
         /// Gets the title of the the updated bundle.
@@ -423,14 +423,14 @@ namespace WixToolset.Mba.Core
         /// <param name="version">The version of the related bundle detected.</param>
         /// <param name="operation">The operation that will be taken on the detected bundle.</param>
         /// <param name="cancelRecommendation">The recommendation from the engine.</param>
-        public DetectRelatedBundleEventArgs(string productCode, RelationType relationType, string bundleTag, bool perMachine, long version, RelatedOperation operation, bool cancelRecommendation)
+        public DetectRelatedBundleEventArgs(string productCode, RelationType relationType, string bundleTag, bool perMachine, string version, RelatedOperation operation, bool cancelRecommendation)
             : base(cancelRecommendation)
         {
             this.ProductCode = productCode;
             this.RelationType = relationType;
             this.BundleTag = bundleTag;
             this.PerMachine = perMachine;
-            this.Version = Engine.LongToVersion(version);
+            this.Version = version;
             this.Operation = operation;
         }
 
@@ -457,7 +457,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the related bundle detected.
         /// </summary>
-        public Version Version { get; private set; }
+        public string Version { get; private set; }
 
         /// <summary>
         /// Gets the operation that will be taken on the detected bundle.
@@ -501,12 +501,12 @@ namespace WixToolset.Mba.Core
         /// <param name="compatiblePackageId">The identity of the compatible package that was detected.</param>
         /// <param name="compatiblePackageVersion">The version of the compatible package that was detected.</param>
         /// <param name="cancelRecommendation">The recommendation from the engine.</param>
-        public DetectCompatibleMsiPackageEventArgs(string packageId, string compatiblePackageId, long compatiblePackageVersion, bool cancelRecommendation)
+        public DetectCompatibleMsiPackageEventArgs(string packageId, string compatiblePackageId, string compatiblePackageVersion, bool cancelRecommendation)
             : base(cancelRecommendation)
         {
             this.PackageId = packageId;
             this.CompatiblePackageId = compatiblePackageId;
-            this.CompatiblePackageVersion = Engine.LongToVersion(compatiblePackageVersion);
+            this.CompatiblePackageVersion = compatiblePackageVersion;
         }
 
         /// <summary>
@@ -522,7 +522,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the compatible package that was detected.
         /// </summary>
-        public Version CompatiblePackageVersion { get; private set; }
+        public string CompatiblePackageVersion { get; private set; }
     }
 
     /// <summary>
@@ -541,14 +541,14 @@ namespace WixToolset.Mba.Core
         /// <param name="version">The version of the related package detected.</param>
         /// <param name="operation">The operation that will be taken on the detected package.</param>
         /// <param name="cancelRecommendation">The recommendation from the engine.</param>
-        public DetectRelatedMsiPackageEventArgs(string packageId, string upgradeCode, string productCode, bool perMachine, long version, RelatedOperation operation, bool cancelRecommendation)
+        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 = Engine.LongToVersion(version);
+            this.Version = version;
             this.Operation = operation;
         }
 
@@ -575,7 +575,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the related package detected.
         /// </summary>
-        public Version Version { get; private set; }
+        public string Version { get; private set; }
 
         /// <summary>
         /// Gets the operation that will be taken on the detected package.
@@ -813,12 +813,12 @@ namespace WixToolset.Mba.Core
         /// <param name="recommendedState">The recommended request state for the compatible package.</param>
         /// <param name="state">The requested state for the compatible package.</param>
         /// <param name="cancelRecommendation">The recommendation from the engine.</param>
-        public PlanCompatibleMsiPackageBeginEventArgs(string packageId, string compatiblePackageId, long compatiblePackageVersion, RequestState recommendedState, RequestState state, bool cancelRecommendation)
+        public PlanCompatibleMsiPackageBeginEventArgs(string packageId, string compatiblePackageId, string compatiblePackageVersion, RequestState recommendedState, RequestState state, bool cancelRecommendation)
             : base(cancelRecommendation)
         {
             this.PackageId = packageId;
             this.CompatiblePackageId = compatiblePackageId;
-            this.CompatiblePackageVersion = Engine.LongToVersion(compatiblePackageVersion);
+            this.CompatiblePackageVersion = compatiblePackageVersion;
             this.RecommendedState = recommendedState;
             this.State = state;
         }
@@ -836,7 +836,7 @@ namespace WixToolset.Mba.Core
         /// <summary>
         /// Gets the version of the compatible package detected.
         /// </summary>
-        public Version CompatiblePackageVersion { get; private set; }
+        public string CompatiblePackageVersion { get; private set; }
 
         /// <summary>
         /// Gets the recommended state to use for the compatible package for planning.
diff --git a/src/WixToolset.Mba.Core/IBootstrapperApplication.cs b/src/WixToolset.Mba.Core/IBootstrapperApplication.cs
index fa655282..0d79122d 100644
--- a/src/WixToolset.Mba.Core/IBootstrapperApplication.cs
+++ b/src/WixToolset.Mba.Core/IBootstrapperApplication.cs
@@ -45,7 +45,7 @@ namespace WixToolset.Mba.Core
             [MarshalAs(UnmanagedType.U4)] RelationType relationType,
             [MarshalAs(UnmanagedType.LPWStr)] string wzBundleTag,
             [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
-            [MarshalAs(UnmanagedType.U8)] long dw64Version,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
             [MarshalAs(UnmanagedType.Bool)] ref bool fCancel,
             [MarshalAs(UnmanagedType.Bool)] ref bool fIgnoreBundle
             );
@@ -63,7 +63,7 @@ namespace WixToolset.Mba.Core
         int OnDetectUpdate(
             [MarshalAs(UnmanagedType.LPWStr)] string wzUpdateLocation,
             [MarshalAs(UnmanagedType.U8)] long dw64Size,
-            [MarshalAs(UnmanagedType.U8)] long dw64Version,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
             [MarshalAs(UnmanagedType.LPWStr)] string wzTitle,
             [MarshalAs(UnmanagedType.LPWStr)] string wzSummary,
             [MarshalAs(UnmanagedType.LPWStr)] string wzContentType,
@@ -86,7 +86,7 @@ namespace WixToolset.Mba.Core
             [MarshalAs(UnmanagedType.U4)] RelationType relationType,
             [MarshalAs(UnmanagedType.LPWStr)] string wzBundleTag,
             [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
-            [MarshalAs(UnmanagedType.U8)] long dw64Version,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
             [MarshalAs(UnmanagedType.U4)] RelatedOperation operation,
             [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
             );
@@ -103,7 +103,7 @@ namespace WixToolset.Mba.Core
         int OnDetectCompatibleMsiPackage(
             [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
             [MarshalAs(UnmanagedType.LPWStr)] string wzCompatiblePackageId,
-            [MarshalAs(UnmanagedType.U8)] long dw64CompatiblePackageVersion,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzCompatiblePackageVersion,
             [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
             );
 
@@ -114,7 +114,7 @@ namespace WixToolset.Mba.Core
             [MarshalAs(UnmanagedType.LPWStr)] string wzUpgradeCode,
             [MarshalAs(UnmanagedType.LPWStr)] string wzProductCode,
             [MarshalAs(UnmanagedType.Bool)] bool fPerMachine,
-            [MarshalAs(UnmanagedType.U8)] long dw64Version,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzVersion,
             [MarshalAs(UnmanagedType.U4)] RelatedOperation operation,
             [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
             );
@@ -181,7 +181,7 @@ namespace WixToolset.Mba.Core
         int OnPlanCompatibleMsiPackageBegin(
             [MarshalAs(UnmanagedType.LPWStr)] string wzPackageId,
             [MarshalAs(UnmanagedType.LPWStr)] string wzCompatiblePackageId,
-            [MarshalAs(UnmanagedType.U8)] long dw64CompatiblePackageVersion,
+            [MarshalAs(UnmanagedType.LPWStr)] string wzCompatiblePackageVersion,
             [MarshalAs(UnmanagedType.U4)] RequestState recommendedState,
             [MarshalAs(UnmanagedType.U4)] ref RequestState pRequestedState,
             [MarshalAs(UnmanagedType.Bool)] ref bool fCancel
diff --git a/src/WixToolset.Mba.Core/IBootstrapperEngine.cs b/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
index 85ca8693..584e0f6d 100644
--- a/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
+++ b/src/WixToolset.Mba.Core/IBootstrapperEngine.cs
@@ -36,7 +36,8 @@ namespace WixToolset.Mba.Core
         [PreserveSig]
         int GetVariableVersion(
             [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
-            [MarshalAs(UnmanagedType.U8)] out long pqwValue
+                                              IntPtr wzValue,
+            [MarshalAs(UnmanagedType.U4)] ref int pcchValue
             );
 
         [PreserveSig]
@@ -112,7 +113,7 @@ namespace WixToolset.Mba.Core
 
         void SetVariableVersion(
             [MarshalAs(UnmanagedType.LPWStr)] string wzVariable,
-            [MarshalAs(UnmanagedType.U8)] long qwValue
+                                              IntPtr wzValue
             );
 
         void CloseSplashScreen();
diff --git a/src/WixToolset.Mba.Core/IEngine.cs b/src/WixToolset.Mba.Core/IEngine.cs
index 84d93bb0..b486e51d 100644
--- a/src/WixToolset.Mba.Core/IEngine.cs
+++ b/src/WixToolset.Mba.Core/IEngine.cs
@@ -96,7 +96,7 @@ namespace WixToolset.Mba.Core
         /// Gets <see cref="Version"/> variables for the engine.
         /// </summary>
         /// <param name="name">The name of the variable.</param>
-        Version GetVariableVersion(string name);
+        string GetVariableVersion(string name);
 
         /// <summary>
         /// Launches a preapproved executable elevated.  As long as the engine already elevated, there will be no UAC prompt.
@@ -161,7 +161,7 @@ namespace WixToolset.Mba.Core
         /// </summary>
         /// <param name="name">The name of the variable.</param>
         /// <param name="value">The value to set.</param>
-        void SetVariable(string name, long value);
+        void SetVariableNumeric(string name, long value);
 
         /// <summary>
         /// Sets string variables for the engine using SecureStrings.
@@ -169,7 +169,7 @@ namespace WixToolset.Mba.Core
         /// <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 SetVariable(string name, SecureString value, bool formatted);
+        void SetVariableString(string name, SecureString value, bool formatted);
 
         /// <summary>
         /// Sets string variables for the engine.
@@ -177,21 +177,14 @@ namespace WixToolset.Mba.Core
         /// <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 SetVariable(string name, string value, bool formatted);
+        void SetVariableString(string name, string value, bool formatted);
 
         /// <summary>
-        /// Sets <see cref="Version"/> variables for the engine.
-        /// 
-        /// The <see cref="Version"/> class can keep track of when the build and revision fields are undefined, but the engine can't.
-        /// Therefore, the build and revision fields must be defined when setting a <see cref="Version"/> variable.
-        /// Use the NormalizeVersion method to make sure the engine can accept the Version.
-        /// 
-        /// To keep track of versions without build or revision fields, use StringVariables instead.
+        /// Sets version variables for the engine.
         /// </summary>
         /// <param name="name">The name of the variable.</param>
         /// <param name="value">The value to set.</param>
-        /// <exception cref="OverflowException">The given <see cref="Version"/> was invalid.</exception>
-        void SetVariable(string name, Version value);
+        void SetVariableVersion(string name, string value);
 
         /// <summary>
         /// Sends error message when embedded.
diff --git a/src/WixToolset.Mba.Core/PackageInfo.cs b/src/WixToolset.Mba.Core/PackageInfo.cs
index d3199c08..d54438f5 100644
--- a/src/WixToolset.Mba.Core/PackageInfo.cs
+++ b/src/WixToolset.Mba.Core/PackageInfo.cs
@@ -159,11 +159,11 @@ namespace WixToolset.Mba.Core
             }
         }
 
-        public static IPackageInfo GetRelatedBundleAsPackage(string id, RelationType relationType, bool perMachine, Version version)
+        public static IPackageInfo GetRelatedBundleAsPackage(string id, RelationType relationType, bool perMachine, string version)
         {
             PackageInfo package = new PackageInfo();
             package.Id = id;
-            package.Version = version.ToString();
+            package.Version = version;
 
             switch (relationType)
             {
diff --git a/src/balutil/BalBootstrapperEngine.cpp b/src/balutil/BalBootstrapperEngine.cpp
index 6a0c66d6..b68ea7c2 100644
--- a/src/balutil/BalBootstrapperEngine.cpp
+++ b/src/balutil/BalBootstrapperEngine.cpp
@@ -133,26 +133,28 @@ public: // IBootstrapperEngine
 
     virtual STDMETHODIMP GetVariableVersion(
         __in_z LPCWSTR wzVariable,
-        __out DWORD64* pqwValue
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout DWORD* pcchValue
         )
     {
         HRESULT hr = S_OK;
         BAENGINE_GETVARIABLEVERSION_ARGS args = { };
         BAENGINE_GETVARIABLEVERSION_RESULTS results = { };
 
-        ExitOnNull(pqwValue, hr, E_INVALIDARG, "pqwValue is required");
+        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);
 
-        *pqwValue = results.qwValue;
+        *pcchValue = results.cchValue;
 
     LExit:
-        SecureZeroMemory(&results, sizeof(results));
         return hr;
     }
 
@@ -410,7 +412,7 @@ public: // IBootstrapperEngine
 
     virtual STDMETHODIMP SetVariableVersion(
         __in_z LPCWSTR wzVariable,
-        __in DWORD64 qwValue
+        __in_z_opt LPCWSTR wzValue
         )
     {
         BAENGINE_SETVARIABLEVERSION_ARGS args = { };
@@ -418,7 +420,7 @@ public: // IBootstrapperEngine
 
         args.cbSize = sizeof(args);
         args.wzVariable = wzVariable;
-        args.qwValue = qwValue;
+        args.wzValue = wzValue;
 
         results.cbSize = sizeof(results);
 
diff --git a/src/balutil/balutil.vcxproj b/src/balutil/balutil.vcxproj
index 8697b5ab..7373040a 100644
--- a/src/balutil/balutil.vcxproj
+++ b/src/balutil/balutil.vcxproj
@@ -2,8 +2,8 @@
 <!-- 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.4.0.33\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" />
-  <Import Project="..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" />
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" />
 
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|ARM64">
@@ -98,8 +98,8 @@
     <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.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props'))" />
-    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props'))" />
     <Error Condition="!Exists('..\..\packages\Nerdbank.GitVersioning.2.1.65\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.2.1.65\build\Nerdbank.GitVersioning.targets'))" />
   </Target>
 </Project>
diff --git a/src/balutil/inc/BalBaseBAFunctions.h b/src/balutil/inc/BalBaseBAFunctions.h
index 4e095fb8..72edadd5 100644
--- a/src/balutil/inc/BalBaseBAFunctions.h
+++ b/src/balutil/inc/BalBaseBAFunctions.h
@@ -103,7 +103,7 @@ public: // IBootstrapperApplication
         __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
         __in_z LPCWSTR /*wzBundleTag*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __inout BOOL* /*pfCancel*/,
         __inout BOOL* /*pfIgnoreBundle*/
         )
@@ -123,7 +123,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnDetectUpdate(
         __in_z LPCWSTR /*wzUpdateLocation*/,
         __in DWORD64 /*dw64Size*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in_z LPCWSTR /*wzTitle*/,
         __in_z LPCWSTR /*wzSummary*/,
         __in_z LPCWSTR /*wzContentType*/,
@@ -148,7 +148,7 @@ public: // IBootstrapperApplication
         __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
         __in_z LPCWSTR /*wzBundleTag*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
         __inout BOOL* /*pfCancel*/
         )
@@ -167,7 +167,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnDetectCompatibleMsiPackage(
         __in_z LPCWSTR /*wzPackageId*/,
         __in_z LPCWSTR /*wzCompatiblePackageId*/,
-        __in DWORD64 /*dw64CompatiblePackageVersion*/,
+        __in LPCWSTR /*wzCompatiblePackageVersion*/,
         __inout BOOL* /*pfCancel*/
         )
     {
@@ -179,7 +179,7 @@ public: // IBootstrapperApplication
         __in_z LPCWSTR /*wzUpgradeCode*/,
         __in_z LPCWSTR /*wzProductCode*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
         __inout BOOL* /*pfCancel*/
         )
@@ -254,7 +254,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnPlanCompatibleMsiPackageBegin(
         __in_z LPCWSTR /*wzPackageId*/,
         __in_z LPCWSTR /*wzCompatiblePackageId*/,
-        __in DWORD64 /*dw64CompatiblePackageVersion*/,
+        __in LPCWSTR /*wzCompatiblePackageVersion*/,
         __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
         __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
         __inout BOOL* /*pfCancel*/
diff --git a/src/balutil/inc/BalBaseBootstrapperApplication.h b/src/balutil/inc/BalBaseBootstrapperApplication.h
index 1d014419..612faf54 100644
--- a/src/balutil/inc/BalBaseBootstrapperApplication.h
+++ b/src/balutil/inc/BalBaseBootstrapperApplication.h
@@ -101,7 +101,7 @@ public: // IBootstrapperApplication
         __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
         __in_z LPCWSTR /*wzBundleTag*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __inout BOOL* pfCancel,
         __inout BOOL* /*pfIgnoreBundle*/
         )
@@ -123,7 +123,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnDetectUpdate(
         __in_z LPCWSTR /*wzUpdateLocation*/,
         __in DWORD64 /*dw64Size*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in_z LPCWSTR /*wzTitle*/,
         __in_z LPCWSTR /*wzSummary*/,
         __in_z LPCWSTR /*wzContentType*/,
@@ -149,7 +149,7 @@ public: // IBootstrapperApplication
         __in BOOTSTRAPPER_RELATION_TYPE /*relationType*/,
         __in_z LPCWSTR /*wzBundleTag*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
         __inout BOOL* pfCancel
         )
@@ -170,7 +170,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnDetectCompatibleMsiPackage(
         __in_z LPCWSTR /*wzPackageId*/,
         __in_z LPCWSTR /*wzCompatiblePackageId*/,
-        __in DWORD64 /*dw64CompatiblePackageVersion*/,
+        __in LPCWSTR /*wzCompatiblePackageVersion*/,
         __inout BOOL* pfCancel
         )
     {
@@ -183,7 +183,7 @@ public: // IBootstrapperApplication
         __in_z LPCWSTR /*wzUpgradeCode*/,
         __in_z LPCWSTR /*wzProductCode*/,
         __in BOOL /*fPerMachine*/,
-        __in DWORD64 /*dw64Version*/,
+        __in LPCWSTR /*wzVersion*/,
         __in BOOTSTRAPPER_RELATED_OPERATION /*operation*/,
         __inout BOOL* pfCancel
         ) 
@@ -264,7 +264,7 @@ public: // IBootstrapperApplication
     virtual STDMETHODIMP OnPlanCompatibleMsiPackageBegin(
         __in_z LPCWSTR /*wzPackageId*/,
         __in_z LPCWSTR /*wzCompatiblePackageId*/,
-        __in DWORD64 /*dw64CompatiblePackageVersion*/,
+        __in LPCWSTR /*wzCompatiblePackageVersion*/,
         __in BOOTSTRAPPER_REQUEST_STATE /*recommendedState*/,
         __inout BOOTSTRAPPER_REQUEST_STATE* /*pRequestedState*/,
         __inout BOOL* pfCancel
diff --git a/src/balutil/inc/BalBaseBootstrapperApplicationProc.h b/src/balutil/inc/BalBaseBootstrapperApplicationProc.h
index d25af1f7..7d5de8e4 100644
--- a/src/balutil/inc/BalBaseBootstrapperApplicationProc.h
+++ b/src/balutil/inc/BalBaseBootstrapperApplicationProc.h
@@ -78,7 +78,7 @@ static HRESULT BalBaseBAProcOnDetectForwardCompatibleBundle(
     __inout BA_ONDETECTFORWARDCOMPATIBLEBUNDLE_RESULTS* pResults
     )
 {
-    return pBA->OnDetectForwardCompatibleBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->dw64Version, &pResults->fCancel, &pResults->fIgnoreBundle);
+    return pBA->OnDetectForwardCompatibleBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->wzVersion, &pResults->fCancel, &pResults->fIgnoreBundle);
 }
 
 static HRESULT BalBaseBAProcOnDetectUpdateBegin(
@@ -96,7 +96,7 @@ static HRESULT BalBaseBAProcOnDetectUpdate(
     __inout BA_ONDETECTUPDATE_RESULTS* pResults
     )
 {
-    return pBA->OnDetectUpdate(pArgs->wzUpdateLocation, pArgs->dw64Size, pArgs->dw64Version, pArgs->wzTitle, pArgs->wzSummary, pArgs->wzContentType, pArgs->wzContent, &pResults->fCancel, &pResults->fStopProcessingUpdates);
+    return pBA->OnDetectUpdate(pArgs->wzUpdateLocation, pArgs->dw64Size, pArgs->wzVersion, pArgs->wzTitle, pArgs->wzSummary, pArgs->wzContentType, pArgs->wzContent, &pResults->fCancel, &pResults->fStopProcessingUpdates);
 }
 
 static HRESULT BalBaseBAProcOnDetectUpdateComplete(
@@ -114,7 +114,7 @@ static HRESULT BalBaseBAProcOnDetectRelatedBundle(
     __inout BA_ONDETECTRELATEDBUNDLE_RESULTS* pResults
     )
 {
-    return pBA->OnDetectRelatedBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->dw64Version, pArgs->operation, &pResults->fCancel);
+    return pBA->OnDetectRelatedBundle(pArgs->wzBundleId, pArgs->relationType, pArgs->wzBundleTag, pArgs->fPerMachine, pArgs->wzVersion, pArgs->operation, &pResults->fCancel);
 }
 
 static HRESULT BalBaseBAProcOnDetectPackageBegin(
@@ -132,7 +132,7 @@ static HRESULT BalBaseBAProcOnDetectCompatiblePackage(
     __inout BA_ONDETECTCOMPATIBLEMSIPACKAGE_RESULTS* pResults
     )
 {
-    return pBA->OnDetectCompatibleMsiPackage(pArgs->wzPackageId, pArgs->wzCompatiblePackageId, pArgs->dw64CompatiblePackageVersion, &pResults->fCancel);
+    return pBA->OnDetectCompatibleMsiPackage(pArgs->wzPackageId, pArgs->wzCompatiblePackageId, pArgs->wzCompatiblePackageVersion, &pResults->fCancel);
 }
 
 static HRESULT BalBaseBAProcOnDetectRelatedMsiPackage(
@@ -141,7 +141,7 @@ static HRESULT BalBaseBAProcOnDetectRelatedMsiPackage(
     __inout BA_ONDETECTRELATEDMSIPACKAGE_RESULTS* pResults
     )
 {
-    return pBA->OnDetectRelatedMsiPackage(pArgs->wzPackageId, pArgs->wzUpgradeCode, pArgs->wzProductCode, pArgs->fPerMachine, pArgs->dw64Version, pArgs->operation, &pResults->fCancel);
+    return pBA->OnDetectRelatedMsiPackage(pArgs->wzPackageId, pArgs->wzUpgradeCode, pArgs->wzProductCode, pArgs->fPerMachine, pArgs->wzVersion, pArgs->operation, &pResults->fCancel);
 }
 
 static HRESULT BalBaseBAProcOnDetectTargetMsiPackage(
@@ -195,7 +195,7 @@ static HRESULT BalBaseBAProcOnPlanCompatibleMsiPackageBegin(
     __inout BA_ONPLANCOMPATIBLEMSIPACKAGEBEGIN_RESULTS* pResults
     )
 {
-    return pBA->OnPlanCompatibleMsiPackageBegin(pArgs->wzPackageId, pArgs->wzCompatiblePackageId, pArgs->dw64CompatiblePackageVersion, pArgs->recommendedState, &pResults->requestedState, &pResults->fCancel);
+    return pBA->OnPlanCompatibleMsiPackageBegin(pArgs->wzPackageId, pArgs->wzCompatiblePackageId, pArgs->wzCompatiblePackageVersion, pArgs->recommendedState, &pResults->requestedState, &pResults->fCancel);
 }
 
 static HRESULT BalBaseBAProcOnPlanCompatibleMsiPackageComplete(
diff --git a/src/balutil/inc/IBootstrapperApplication.h b/src/balutil/inc/IBootstrapperApplication.h
index e17d2589..9cc19120 100644
--- a/src/balutil/inc/IBootstrapperApplication.h
+++ b/src/balutil/inc/IBootstrapperApplication.h
@@ -32,7 +32,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
         __in BOOTSTRAPPER_RELATION_TYPE relationType,
         __in_z LPCWSTR wzBundleTag,
         __in BOOL fPerMachine,
-        __in DWORD64 dw64Version,
+        __in_z LPCWSTR wzVersion,
         __inout BOOL* pfCancel,
         __inout BOOL* pfIgnoreBundle
         ) = 0;
@@ -48,7 +48,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
     STDMETHOD(OnDetectUpdate)(
         __in_z_opt LPCWSTR wzUpdateLocation,
         __in DWORD64 dw64Size,
-        __in DWORD64 dw64Version,
+        __in_z LPCWSTR wzVersion,
         __in_z_opt LPCWSTR wzTitle,
         __in_z_opt LPCWSTR wzSummary,
         __in_z_opt LPCWSTR wzContentType,
@@ -69,7 +69,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
         __in BOOTSTRAPPER_RELATION_TYPE relationType,
         __in_z LPCWSTR wzBundleTag,
         __in BOOL fPerMachine,
-        __in DWORD64 dw64Version,
+        __in_z LPCWSTR wzVersion,
         __in BOOTSTRAPPER_RELATED_OPERATION operation,
         __inout BOOL* pfCancel
         ) = 0;
@@ -84,7 +84,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
     STDMETHOD(OnDetectCompatibleMsiPackage)(
         __in_z LPCWSTR wzPackageId,
         __in_z LPCWSTR wzCompatiblePackageId,
-        __in DWORD64 dw64CompatiblePackageVersion,
+        __in_z LPCWSTR wzCompatiblePackageVersion,
         __inout BOOL* pfCancel
         ) = 0;
 
@@ -94,7 +94,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
         __in_z LPCWSTR wzUpgradeCode,
         __in_z LPCWSTR wzProductCode,
         __in BOOL fPerMachine,
-        __in DWORD64 dw64Version,
+        __in_z LPCWSTR wzVersion,
         __in BOOTSTRAPPER_RELATED_OPERATION operation,
         __inout BOOL* pfCancel
         ) = 0;
@@ -156,7 +156,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperApplication, IUnknown, "53C31D56-49C0-426B-A
     STDMETHOD(OnPlanCompatibleMsiPackageBegin)(
         __in_z LPCWSTR wzPackageId,
         __in_z LPCWSTR wzCompatiblePackageId,
-        __in DWORD64 dw64CompatiblePackageVersion,
+        __in_z LPCWSTR wzCompatiblePackageVersion,
         __in BOOTSTRAPPER_REQUEST_STATE recommendedState,
         __inout BOOTSTRAPPER_REQUEST_STATE* pRequestedState,
         __inout BOOL* pfCancel
diff --git a/src/balutil/inc/IBootstrapperEngine.h b/src/balutil/inc/IBootstrapperEngine.h
index 3b648df1..cf055102 100644
--- a/src/balutil/inc/IBootstrapperEngine.h
+++ b/src/balutil/inc/IBootstrapperEngine.h
@@ -21,7 +21,8 @@ DECLARE_INTERFACE_IID_(IBootstrapperEngine, IUnknown, "6480D616-27A0-44D7-905B-8
 
     STDMETHOD(GetVariableVersion)(
         __in_z LPCWSTR wzVariable,
-        __out DWORD64* pqwValue
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout DWORD* pcchValue
         ) = 0;
 
     STDMETHOD(FormatString)(
@@ -95,7 +96,7 @@ DECLARE_INTERFACE_IID_(IBootstrapperEngine, IUnknown, "6480D616-27A0-44D7-905B-8
 
     STDMETHOD(SetVariableVersion)(
         __in_z LPCWSTR wzVariable,
-        __in DWORD64 qwValue
+        __in_z_opt LPCWSTR wzValue
         ) = 0;
 
     STDMETHOD(CloseSplashScreen)() = 0;
diff --git a/src/balutil/packages.config b/src/balutil/packages.config
index 4db0b6a7..be1bf8e2 100644
--- a/src/balutil/packages.config
+++ b/src/balutil/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Nerdbank.GitVersioning" version="2.1.65" targetFramework="native" developmentDependency="true" />
-  <package id="WixToolset.BootstrapperCore.Native" version="4.0.33" targetFramework="native" />
-  <package id="WixToolset.DUtil" version="4.0.51" targetFramework="native" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.37" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.55" targetFramework="native" />
 </packages>
\ No newline at end of file
diff --git a/src/bextutil/BextBundleExtensionEngine.cpp b/src/bextutil/BextBundleExtensionEngine.cpp
index a78b3130..983782a9 100644
--- a/src/bextutil/BextBundleExtensionEngine.cpp
+++ b/src/bextutil/BextBundleExtensionEngine.cpp
@@ -185,26 +185,28 @@ public: // IBundleExtensionEngine
 
     virtual STDMETHODIMP GetVariableVersion(
         __in_z LPCWSTR wzVariable,
-        __out DWORD64* pqwValue
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout DWORD* pcchValue
         )
     {
         HRESULT hr = S_OK;
         BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_ARGS args = { };
         BUNDLE_EXTENSION_ENGINE_GETVARIABLEVERSION_RESULTS results = { };
 
-        ExitOnNull(pqwValue, hr, E_INVALIDARG, "pqwValue is required");
+        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);
 
-        *pqwValue = results.qwValue;
+        *pcchValue = results.cchValue;
 
     LExit:
-        SecureZeroMemory(&results, sizeof(results));
         return hr;
     }
 
@@ -263,7 +265,7 @@ public: // IBundleExtensionEngine
 
     virtual STDMETHODIMP SetVariableVersion(
         __in_z LPCWSTR wzVariable,
-        __in DWORD64 qwValue
+        __in_z_opt LPCWSTR wzValue
         )
     {
         BUNDLE_EXTENSION_ENGINE_SETVARIABLEVERSION_ARGS args = { };
@@ -271,7 +273,7 @@ public: // IBundleExtensionEngine
 
         args.cbSize = sizeof(args);
         args.wzVariable = wzVariable;
-        args.qwValue = qwValue;
+        args.wzValue = wzValue;
 
         results.cbSize = sizeof(results);
 
diff --git a/src/bextutil/bextutil.vcxproj b/src/bextutil/bextutil.vcxproj
index c27d8aee..00478a6e 100644
--- a/src/bextutil/bextutil.vcxproj
+++ b/src/bextutil/bextutil.vcxproj
@@ -2,8 +2,8 @@
 <!-- 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.4.0.33\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" />
-  <Import Project="..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" />
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" />
 
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|ARM64">
@@ -87,8 +87,8 @@
     <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.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props'))" />
-    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props'))" />
     <Error Condition="!Exists('..\..\packages\Nerdbank.GitVersioning.2.1.65\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.2.1.65\build\Nerdbank.GitVersioning.targets'))" />
   </Target>
 </Project>
diff --git a/src/bextutil/inc/IBundleExtensionEngine.h b/src/bextutil/inc/IBundleExtensionEngine.h
index 7772b016..77ea2770 100644
--- a/src/bextutil/inc/IBundleExtensionEngine.h
+++ b/src/bextutil/inc/IBundleExtensionEngine.h
@@ -34,7 +34,8 @@ DECLARE_INTERFACE_IID_(IBundleExtensionEngine, IUnknown, "9D027A39-F6B6-42CC-973
 
     STDMETHOD(GetVariableVersion)(
         __in_z LPCWSTR wzVariable,
-        __out DWORD64* pqwValue
+        __out_ecount_opt(*pcchValue) LPWSTR wzValue,
+        __inout DWORD* pcchValue
         ) = 0;
 
     STDMETHOD(Log)(
@@ -55,6 +56,6 @@ DECLARE_INTERFACE_IID_(IBundleExtensionEngine, IUnknown, "9D027A39-F6B6-42CC-973
 
     STDMETHOD(SetVariableVersion)(
         __in_z LPCWSTR wzVariable,
-        __in DWORD64 qwValue
+        __in_z_opt LPCWSTR wzValue
         ) = 0;
 };
diff --git a/src/bextutil/packages.config b/src/bextutil/packages.config
index 4db0b6a7..be1bf8e2 100644
--- a/src/bextutil/packages.config
+++ b/src/bextutil/packages.config
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
   <package id="Nerdbank.GitVersioning" version="2.1.65" targetFramework="native" developmentDependency="true" />
-  <package id="WixToolset.BootstrapperCore.Native" version="4.0.33" targetFramework="native" />
-  <package id="WixToolset.DUtil" version="4.0.51" targetFramework="native" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.37" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.55" targetFramework="native" />
 </packages>
\ No newline at end of file
diff --git a/src/mbanative/mbanative.vcxproj b/src/mbanative/mbanative.vcxproj
index 3fe9ef6b..3e1de28f 100644
--- a/src/mbanative/mbanative.vcxproj
+++ b/src/mbanative/mbanative.vcxproj
@@ -5,8 +5,8 @@
   <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.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" />
-  <Import Project="..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" />
+  <Import Project="..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props" Condition="Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" />
+  <Import Project="..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props" Condition="Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" />
 
   <ItemGroup Label="ProjectConfigurations">
     <ProjectConfiguration Include="Debug|ARM64">
@@ -94,7 +94,7 @@
     <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.2.1.65\build\Nerdbank.GitVersioning.targets')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\Nerdbank.GitVersioning.2.1.65\build\Nerdbank.GitVersioning.targets'))" />
-    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.33\build\WixToolset.BootstrapperCore.Native.props'))" />
-    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.51\build\WixToolset.DUtil.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.BootstrapperCore.Native.4.0.37\build\WixToolset.BootstrapperCore.Native.props'))" />
+    <Error Condition="!Exists('..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props')" Text="$([System.String]::Format('$(ErrorText)', '..\..\packages\WixToolset.DUtil.4.0.55\build\WixToolset.DUtil.props'))" />
   </Target>
 </Project>
\ No newline at end of file
diff --git a/src/mbanative/packages.config b/src/mbanative/packages.config
index 443e0094..3faa75d5 100644
--- a/src/mbanative/packages.config
+++ b/src/mbanative/packages.config
@@ -4,6 +4,6 @@
   <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="2.1.65" targetFramework="native" developmentDependency="true" />
-  <package id="WixToolset.BootstrapperCore.Native" version="4.0.33" targetFramework="native" />
-  <package id="WixToolset.DUtil" version="4.0.51" targetFramework="native" />
+  <package id="WixToolset.BootstrapperCore.Native" version="4.0.37" targetFramework="native" />
+  <package id="WixToolset.DUtil" version="4.0.55" targetFramework="native" />
 </packages>
\ No newline at end of file