What is .XEX file?
Application or video game developed for the Xbox 360 gaming console; designed to run on an Xbox 360 and is not meant to be opened on a PC.
The "default.xex" file is used to update the Xbox 360 so that it is backwards compatible with original Xbox games. For instructions on updating the Xbox 360 with the default.xex file, view Microsoft's Xbox 360 Update support page.
Unlike games for the original Xbox, there is currently no emulator available that opens Xbox 360 games. Original Xbox games used the .XBE file extension.
Recommended Software Programs to open .XEX file