KALAMITY'S PROFILE

I was recommending a game to a friend, and he seems to be having trouble running this game on his computer. The game is Alter A.I.L.A Genesis made on RPG Maker 2003. He has a Mac, and this game does not work on the Mac nor the Windows emulator on the Mac. When he tries to run the game on his Mac OS, he gets the error message "the contents of the file RPG_RT.exe cannot be extracted" which is weird because you don't extract exe files, you run them. Have there been known issues with Mac compatibility with RPGmaker games? Are there any solutions that anybody can think of?
Thanks for listening.