The original Microsoft Xbox does not use ISO 9660. It uses a proprietary file system named or XDVDFS . When you rip an Xbox game using software like DVD2Xbox, it creates an XISO. This file is not readable by standard disk mounter tools. If you try to open it on a PC, it looks like a corrupted or empty disc.
: Conversion often strips out "Redump" data that prevents games from booting in emulators. Convert Iso To Xiso