v4.5
$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.1\Framework\v4.0\Microsoft.FSharp.Targets
$(MSBuildExtensionsPath32)\..\Microsoft SDKs\F#\3.1\Framework\v4.0\Microsoft.FSharp.Targets
$(MSBuildFrameworkToolsPath32)\Microsoft.FSharp.Targets
$(MSBuildBinPath)\Microsoft.FSharp.Targets
<_DebugFileExt Condition="'$(FscDebugFileExt)' != ''">$(FscDebugFileExt)
<_DebugFileExt Condition="'$(_DebugFileExt)' == ''">.mdb