Raw sound files take up massive amounts of room.
Download the highly compressed Mario Kart Wii archive from a trusted ROM preservation site. Download and install (PC) or ZArchiver (Android). Mario Kart Wii Highly Compressed
The gaming community quickly developed brilliant workarounds to eliminate this useless weight: Raw sound files take up massive amounts of room
Once you have a compressed file (like a WBFS or RVZ), you can’t just double-click it. You need an emulator, a piece of software that mimics the Wii hardware on your computer or phone. Mario Kart Wii Highly Compressed