Message6162

Here is a small test.bat which handles both quoted and unquoted %COMSPEC% variables:

test.bat
--------
:finish
set _UNQUOTED_COMSPEC=%COMSPEC:"=%
"%_UNQUOTED_COMSPEC%" /c exit /b %E%

and then using it:

C:\test>set ComSpec=C:\Program Files (x86)\Copy of cmd\cmd.exe
C:\test>test.bat
C:\test>set _UNQUOTED_COMSPEC=C:\Program Files (x86)\Copy of cmd\cmd.exe
C:\test>"C:\Program Files (x86)\Copy of cmd\cmd.exe" /c exit /b
C:\test>

C:\test>set ComSpec="C:\Program Files (x86)\Copy of cmd\cmd.exe"
C:\test>test.bat
C:\test>set _UNQUOTED_COMSPEC=C:\Program Files (x86)\Copy of cmd\cmd.exe
C:\test>"C:\Program Files (x86)\Copy of cmd\cmd.exe" /c exit /b
C:\test>

I think this could solve the issue