Search notes:

Microsoft.VCToolsVersion.default.txt

The content of this file corresponds to the version number of the Visual Studio tools, for example 14.28.29910.
The value of the version stored in this file helps to find some binaries, such as the Visual C Compiler (cl) which is located under a directory like 
C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29910\bin\Hostx64\x64\cl.exe
rem                                                                         ^^^^^^^^^^^

See also

Compare with Microsoft.VCRedistVersion.default.txt

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