VSCMD_START_DIR vsdevcmd.bat , . , %USERPROFILE%\source ( , ).
"" " VS 2017" , :
%comspec% /k "set VSCMD_START_DIR=C:\temp && "C:\Program Files (x86)\Microsoft Visual Studio\2017\Professional\Common7\Tools\VsDevCmd.bat""
, vsdevcmd.bat .
%USERPROFILE%\source ( , , , - "" ), vsdevcmd.bat "Start In" (.. ").