Japanese-region Wii ISO files are disc images of Nintendo Wii games originally released exclusively for Japan. These NTSC-J format titles often include unique games, visual novels, rhythm games, and early RPGs never localized for North America or Europe.
While often called "ISOs," Wii game files appear in several different formats depending on how they are intended to be used:
The Wii console, released by Nintendo in 2006, was a popular gaming system that supported various types of games, including those from the Japanese region. Wii games were typically distributed on Wii optical discs, but some users were interested in creating and playing backups of these games in ISO format.