- How can a batch file tell whether it's being run in a DOS box under Windows?

Date: 5 Feb 2002 22:03:03 -0400

 When Windows 3.0 or 3.1 is running, the DOS environment will contain a
 definition of the string windir, in lower case. That's not really
 useful, however, because the batch statement

  if "%windir%" == "" ...

 will test for an environment variable WINDIR in upper case.

 Your only real option is to write a program as suggested by the
 following question, and have it return a value which your batch file can
 test via "if errorlevel".

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