what is a wbfs file
WBFS, or Wii Backup File System, is a file system developed by Wii homebrew coder Waninkoko.[1] It uses Waninkoko's cIOS and works by creating a WBFS partition on a SD or USB device. A Wii homebrew application may then be run to dump a Wii game to the partition. The titles may then be launched using a Wii USB loader, which uses cIOS and USB 2.0 to load games from an external device.