It's just plain impossible to emulate the X-Box by plopping a disc in your DVD-ROM drive (ATAPI, SCSI, tin can and duct tape, it doesn't matter) and running a title in an emulator. The discs just plain won't work. Until someone devs a way to rip an ISO straight from the console (as is the case with the Dreamcast), X-Box emulation (for commercial titles, at least) is improbable.