An is a digital backup of a physical Nintendo Switch game cartridge. The format originates from the "NX Cartridge Image" and contains the game data, including the initial release version and, occasionally, bundled updates or DLC.

The Super Mario Odyssey XCI file offers a convenient and space-saving way to install and play the game on a Nintendo Switch console.

For collectors, having a digital XCI backup ensures that their progress and the game itself remain accessible even if the physical cartridge is lost or damaged. Technical Requirements for XCI Files