VS 2010 build on 32bit and 64 bit (Program Files)

I have a VS 2010 Post Build Event that runs GacUtil.exe.

On my 32-bit laptop I reference:

"C:\Program Files \Microsoft SDKs\Windows\v7.0A\bin\gacutil.exe" -i "$(TargetPath)". 

On my 64-bit dev server it needs to be

"C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\bin\gacutil.exe" -i "$(TargetPath)". 

But I want to check-in a pr开发者_StackOverflow中文版oject that works on both systems.

Has anyone figured out how to do a post build event that is architecture independent?

I call this in the post-build step: sgen.

Update Visual Studio 2013:

This command works both on 32- and 64-bit machines:

"$(SDK40ToolsPath)$(SGenSubFolder)sgen.exe" /nologo /force /assembly:"$(TargetPath)" /compiler:/platform:$(Platform) /type:"[NameOfTheType]"

The $(SGenSubfolder) property is defined as

<PropertyGroup Condition=" '$(Platform)' == 'x64' ">
  <SGenSubFolder>x64\</SGenSubFolder>
</PropertyGroup>

What a mess...

for /f "tokens=2,*" %a in ('reg query "HKLM\Software\Microsoft\Microsoft SDKs\Windows\v7.0a" /v InstallationFolder ^| findstr InstallationFolder') do "%b\bin\Gacutil.exe" -i "$(TargetPath)"