directory when using custom firmware or compatible emulators. Safety Note : Homebrew tools like XCI-Explorer

XCI (eXtensible Content Interface) is a file format used for storing and distributing digital content, including games. In the context of Super Smash Bros. Ultimate on the Nintendo Switch, XCI files have become popular among gamers who want to access the game without purchasing it from the Nintendo eShop.

(and its successors) use XCI files to play the game on a PC. Users must provide their own "Prod.keys" and "Title.keys" extracted from their physical Switch to decrypt the file. Custom Firmware (CFW):