It sounds like you’re referring to a compressed file for The Legend of Zelda: Tears of the Kingdom in format (a Nintendo Switch cartridge dump), bundled in a .7z archive.
Early releases of Tears of the Kingdom were leaky "Cafe NSPs" that had massive memory leaks. The XCI version (especially the "Rebootless" releases) is statistically more stable. Tears of the Kingdom -XCI-.7z