It's not going to happen, because like others have already said, .exe are WINDOWS executables, so, trying to run them on a Mac would be like speaking Spanish to a Frenchman, maybe some words are similar, but in the end of the day, it ain't gonna work. I mean, I'm pretty sure there's something called 'File Juicer' (or something like that), that can extract .exe files, but, that's just extracting, not running, and I'm not even sure if it works on the PPC models, so, as others have said, find the Mac equivalent, which you'll 98% of the time be able to find.