This is a highly compressed archive created by the software 7-Zip. It is not a playable game format. It is used strictly to shrink the file size of the game for faster downloading and efficient archiving on your hard drive. The Comparison: Storage vs. Playability XCI File Format 7Z Archive Format Playable in Emulator Yes, natively. No, must be extracted first. File Size Large (typically 16GB+). Small (highly compressed). Primary Use Playing the game. Downloading and archiving. System Load Low CPU usage to load. High CPU usage to extract. Why People Think One is "Better"

"Tears of the Kingdom XCI7Z" likely refers to a highly compressed 7-Zip archive of a for The Legend of Zelda: Tears of the Kingdom