IsWin determine is the specified file a Windows GUI program
BS Editor: IsWin 1.3 Is the specified file a Windows GUI program?

IsWin C:MyProg.Exe
If ErrorLevel 3 GoTo Problem
If ErrorLevel 2 GoTO IsForWin32
If ErrorLevel 1 GoTo IsForWin16
Goto IsForDos

In debugging you might just use to view the errorlevel result.

echo %ERRORLEVEL

Copyrighted, but may be freely distributed and used for any purpose except military. Works on EXE, COM and DLL files. MASM source included. Version 1.3 adds detection for PKLite DOS exes and Win32 exes. you can free download iswin 1.3 now.