Good news: Dolphin Emulator has native support for WBFS files. You do need to convert them to ISO.
The is the standard for efficient storage and playability on modern emulators and soft-modded consoles. While the format saves space and is convenient for the massive modding community, users should prioritize creating their own backups from discs they own to stay on the right side of copyright law and avoid malware. mario kart wii wbfs file