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I'm attempting to build a project using MSBuild (v4.0) on a 64-bit machine. For some reason, MSBuild is attempting to load a 32-bit extension, and I cannot figure out why. I've reduced the problem to the smallest set in order to demonstrate the issue. Using the following MSBuild project file: <Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003" ToolsVersion="4.0"> <Target Name="test"> <Message Text="bin path: $(MSBuildBinPath)" /> <Message Text="extensions path: $(MSBuildExtensionsPath)" /> <Message Text="extensions path (x86): $(MSBuildExtensionsPath32)" /> <Message Text="extensions path (x64): $(MSBuildExtensionsPath64)" /> </Target> </Project> I get this output: Microsoft (R) Build Engine Version 4.0.30319.1 [Microsoft .NET Framework, Version 4.0.30319.1] Copyright (C) Microsoft Corporation 2007. All rights reserved. Build started 8/27/2010 9:56:35 AM. Project "D:\5\test.proj" on node 1 (default targets). test: bin path: C:\Windows\Microsoft.NET\Framework64\v4.0.30319 extensions path: C:\Program Files (x86)\MSBuild extensions path (x86): C:\Program Files (x86)\MSBuild extensions path (x64): C:\Program Files\MSBuild Done Building Project "D:\5\test.proj" (default targets). Build succeeded. 0 Warning(s) 0 Error(s) Time Elapsed 00:00:00.03 MSBuild obviously knows about the 32bit and 64bit extensions path, and from the binary path it seems clear that I'm running the 64-bit MSBuild.exe, but for some reason it believes that extensions should be loaded from Program Files (x86) instead of Program Files . This is causing me trouble, as I have an extension that I need loaded, that MUST be loaded correctly in a 32bit/64bit process, and it will not load (MSBuild is attempting to load the 32bit version in a 64bit process). Why?

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