In the context of the Xbox 360, "ISO" and "XEX" refer to how game data is stored and executed on modified consoles:

: The .xex file is the actual executable (like an .exe on Windows) that runs the game on an Xbox.

: Many users prefer GOD (Games on Demand) format for standard play, as it is more stable for some titles and integrates better with the console dashboard. Game Overview & Availability Go to product viewer dialog for this item. PC Game Tomb Raider: Anniversary - Action Games

: It allows for easy access to game files, which is useful for applying custom mods , textures, or code modifications.