Well, that's rather interesting really. As stated, you're trying to run a Windows program, so the fact that you're getting anything at all is actually quite fascinating, unless you left you the fact that you're running Windows on your Mac. One would not expect a Windows program to run even enough to spit out a message like that under Mac OS X. The executable format is different, every API from top to bottom is different, and Mac OS X shouldn't really consider a .exe file to be an executable binary.