To use a file, you should dump your own copy of the game. Requirements: A softmodded Wii with the Homebrew Channel installed. Wii Fit Plus game disc. A USB drive or SD card (formatted to FAT32 or NTFS). A backup tool like CleanRip . Steps:
Use a tool like Wii Backup Manager on your computer to transfer your wii-fit-plus.wbfs file onto a FAT32 or NTFS-formatted USB drive. wii fit plus wbfs
After formatting, create a folder named (lowercase) in the root of the drive. Inside that folder you will place the converted Wii Fit Plus game folder. To use a file, you should dump your own copy of the game