.WII File Extension

Disc image format used by the homebrew community for Nintendo Wii discs; saves a Wii game in a scrambled format; can be unscrambled and converted to the .ISO format with Wii Unscrambler and then burned to a standard disc; sometimes used for backing up Wii games.

The WII format is not supported by Nintendo, the developers of the Wii game console system.

A WII file is a game data archive used by a Nintendo Wii video game created using the Asura Engine. It contains game assets, such as in-game music and sound effects. The Wii version of The Simpsons Game contains WII files.

The Asura Engine is a video game development engine created by Rebellion Developments. Many games published by Rebellion and other publishers, such as Electronic Arts, have been developed using the Asura Engine.

Most games developed using the Asura Engine store their audio assets in .ASR files. However, the Wii versions of some games, such as The Simpsons Game, store these assets in WII files instead.

WII files are not meant to be opened by players. Modders have yet to create tools for opening and extracting data from a game's WII files.