🏎️ Mario Kart Wii (WBFS) Setup Guide If you have a homebrewed Wii and want to play Mario Kart without swapping discs, using a .wbfs file is the way to go. These files are "scrubbed," meaning they remove empty data to save space, usually taking up about instead of the full 4.7 GB found in standard .iso files. How to Get & Set Up Your File