On your USB drive, create a folder named wbfs . Inside that, create a subfolder named Mario's Final Adventure [SMNEMF] .
Use a tool like CleanRip on your Wii to dump your original NSMBW disc to an ISO file on your PC. Or, use a backup tool (again, only if you own the original). Mario 39-s Final Adventure Wii Wbfs
It sounds like you’re looking for information on for the Wii in WBFS format . On your USB drive, create a folder named wbfs