The Toolset.props files for Visual Studio 2013 can be found in:
%ProgramFiles%\MSBuild\Microsoft.Cpp\v4.0\V120\Platforms\Win32\PlatformToolsets\v120 %ProgramFiles%\MSBuild\Microsoft.Cpp\v4.0\V120\Platforms\Win32\PlatformToolsets\v120_xp %ProgramFiles%\MSBuild\Microsoft.Cpp\v4.0\V120\Platforms\x64\PlatformToolsets\v120 %ProgramFiles%\MSBuild\Microsoft.Cpp\v4.0\V120\Platforms\x64\PlatformToolsets\v120_xp
Files for other versions of Visual Studio should be located in similar places.
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