Notes about the MII file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The MII file type is primarily associated with 'Wii' by Nintendo. The Wii is the fifth home video game console released by Nintendo. The console is the direct successor to the Nintendo GameCube. Using the Mii Channel on the Nintendo Wii gaming machine you can create avatars which are given the generic name of Mii so that the avatar become a Wee Mii (or wee me when you pronounce it).