The DR-DOS/OpenDOS Enhancement Project

You do realize that if you comment out the code to check for OS version:

cmdefint.c, line 119:
if (!CheckOS()) return 1;

and msdefint.c, line 70:
#define CHECKOS

and recompile (use build), it should just disable the check for the operating system and work.

Just mail me if you have problems, i will try to get back to you.