RMGE01.wbfs RMGE01.wbf1 Use Wii Backup Manager (Windows) or wit (command line) to convert ISO images to .wbfs files.
wbfs Inside wbfs , each game should be in its own folder, or the .wbfs file can sit directly inside wbfs (less common). The recommended modern structure is: wii backup file system
/wbfs/Super Mario Galaxy [RMGE01]/RMGE01.wbfs If the game is dual-layer (e.g., Super Smash Bros. Brawl), you may have a second file: RMGE01