After conversion, always test the XEX folder in Xenia on your PC before copying to your Xbox 360. Emulators are more tolerant of errors than real hardware, but they'll at least tell you if default.xex is valid.
Now you have everything you need to liberate your Xbox 360 games from bulky ISO containers and enjoy faster loading, smaller file sizes, and modding possibilities. Happy gaming xbox 360 iso to xex converter