Remember: The legitimate path is to buy the disc and rip it yourself. If a game is still available on the Xbox Store (via backwards compatibility), buy it there. Only turn to ISO creation for games physically rotting on your shelf or lost to licensing hell.
Technically, while the term "ISO" is used universally by the community, original Xbox game dumps are often handled as . A standard ISO usually follows the file structure of a typical data disc, but the Xbox used a customized file system optimized for gaming performance. When a disc is "dumped" (copied) to a PC, it is often converted into this XISO format to be read by emulators or homebrew software. xbox classic iso