Because the Wii's native storage preference is FAT32 , large files (over 4GB) must be split. WBFS managers like Wii Backup Manager can automatically split a Skyward Sword WBFS into two parts (e.g., .wbfs and .wbf1 ) to fit these drive constraints. Enhancing the Experience: Emulation and 4K Textures
: WBFS files are "scrubbed," meaning the "junk data" used to fill physical Wii discs is removed, shrinking the file size significantly without losing quality. zelda skyward sword wbfs