Wii Backup File System File
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What is a WBFS file?
A WBFS file is a Nintendo Wii game disk image created using Wiimms WBFS Tool, Wii Backup Manager, or another Nintendo Wii-related program. It contains a Wii game that can be played on a Nintendo Wii, using USB Loader GX, or a Wii emulator, such as Dolphin. While players previously had to store and load WBFS files from specially-formatted USB drives, they can now store WBFS files on FAT32- or NTFS-formatted drives.
After storing a WBFS file on a USB drive, players can run the file (and play the game it contains) on their Wii using USB Loader GX, an application that loads WBFS disk images. This process is, of course, unofficial and not supported by Nintendo. Players can also use Wii emulators, such as Dolphin, to play the game a WBFS file contains.
Since WBFS files do not store the padding present in official Wii disk images, WBFS files' size is typically much smaller than the games from which they were created. In the past, WBFS files were sometimes paired with .WBF1 files, to allow USB loaders to process and play large games.
How to open a WBFS file
To play a WBFS file on a Nintendo Wii, you must install cIOS and USB Loader GX on your Wii. Then, you can use USB Loader GX to load and play the game your WBFS file contains.
If you want to play the game a WBFS file contains on your PC, you can do so in the Dolphin Wii emulator (cross-platform). You can also use Wii Backup Manager (Windows), Wiithon (Linux), or WiiJManager (cross-platform) to convert WBFS files to .ISO files.