Everything on the graphics, network, and Sound/Joystick tabs I believe, is in the registry. That's resolutions, what joystick, what type of internet connection, what port, I think even your PXO information that's set in game is in the registry (and there was talk about letting you configure that in the launcher as well, not sure what happened with that). Maybe one or two of the options on those tabs is in a config file, but I'm pretty sure most of that is registry-bound. Easiest way to tell is when the screen resolution changes don't seem to have any effect.