I have Quake II on my modded xbox. I got it through mIRC. You can tell that it's PC Based. When you go to options it asks if you want mouse inverted, keyboard setup, etc. It plays fine and everything. I then looked at the files within the folder. It's very similiar to the Half Life PC game I have. I just want to know how to make games PC based. I know that it can be done and shouldn't be very hard, but I need more info from others on how to do it.
You can't without the original source code and the xbox dev kit. Its out of the question, almost impossible. It has those options, of mouse and keyboard because it gives you the option to connect such devices to the controller ports.