Mac OS doesn't actually run any .exe files. Mac did put out a program called Bootcamp though that will run Windows on your mac (you'll need your own version of Windows too), while still keeping the Mac OS in the background. It used to be free but now you have to buy it, I believe it comes with Leopard. So if you were really wanting to get Keyclones to run on your Mac, you would need to put out some cash.