WBFS (Wii Backup File System) is the standard format used by Wii USB loaders. To prepare your file:
The Wii, released in 2006, was a popular console for both casual and hardcore gamers. WBFS was a file system used for Wii game backups stored on external hard drives or other storage media, making it easy for users to manage and play their game collections. punchout wii rom wbfs link