Search notes:

%VCINSTALLDIR%/Auxiliary/Build

Files within this directory might be:

vcvars32.bat
vcvars64.bat
vcvarsall.bat
vcvarsamd64_x86.bat
vcvarsx86_amd64.bat
Microsoft.VCRedistVersion.default.txt (Specifies the default toolset version number, such as 14.16.27012.)
Microsoft.VCToolsVersion.default.props
Microsoft.VCToolsVersion.default.txt (Contains a version number)

vcvars32.bat / vcvars64.bat

These batch files are responsible to set the Visual Studio environment variables.

Batch file	calls	tools used	code created
`vcvars32.bat`	`vcvarsall.bat x86 %*`	32-bit x86	32-bit x86
`vcvars64.bat`	`vcvarsall.bat x64 %*`	64-bit x64	64-bit x64
`vcvarsx86_amd64`	`vcvarsall.bat x86x64 %*`	32-bit x86	64-bit x64
`vcvarsamd64_x86`	`vcvarsall.bat x64_x86 %*`	64-bit x64	32-bit x86