I just downloaded XCOM UFO Defense from direct2drive.com. I also have DosBox 0.73. I have OS X 10.5.7 on my MacBook. I don't know anything about dos, or about software in general. I have I just want to kill some aliens, and have fun with this game. I've scoured the websites, but I can't figure out to get it to work? So far, I have discovered how to mount my files. And I have done this, and I can see the .exe file in the screen. However, I get the reply "this program cannot be run in dos mode." What's up with that? Please... I want to kill some greys.