First things first...are you a registered GameEx user? Playing DVD's from the hard drive is a registered user feature, so if not, you will have to take care of that before you can play any DVD's from your hard drive. I don't know what format GameEx uses, so I can't help there. I think it just uses built in codecs for DVD playback, so I would assume you have to have the Video_TX and Audio_TS directories. Alternately, you could use a program (Daemon Tools, Alcohol, etc.) to mount the ISO image first if you don't want to convert formats and ISO is not supported.