XCI files are related to the Nintendo Switch's game cartridge format. XCI is a file extension used for Switch game images that have been ripped directly from game cartridges. These files can be used to install games onto a Switch console, typically through tools like the "nxShell" or other homebrew applications, often requiring a modded or jailbroken Switch.
It contains the game’s raw data, including game assets and executables, mimicking the exact layout of a physical cartridge. super smash bros. ultimate switch xci
Smash Ultimate has numerous balance patches and Fighters Pass characters (like Piranha Plant or Sora). These are usually XCI files are related to the Nintendo Switch's