A WBFS file is a disc image format specifically designed to store Wii game backups on modern storage devices like USB drives or SD cards.
: Unlike standard ISO files, which are always 4.37GB regardless of the game's actual size, WBFS files "scrub" out useless "junk data" used to fill physical DVDs. wii roms wbfs europe link
: Because older FAT32 file systems have a 4GB limit, WBFS files larger than 4GB are often automatically split (e.g., into .wbfs and .wbf1 ) to remain compatible. A WBFS file is a disc image format
: Most modern Wii homebrew, such as USB Loader GX or WiiFlow , require or strongly prefer this format. Reliable Sources for European (PAL) Wii ROMs wii roms wbfs europe link