Wad File — Super Mario Galaxy 2

WAD files, short for Wii Application File or Wii Archive File, were package files used by Nintendo for distributing and installing games and other software on the Wii, Wii U, and WiiWare services. A WAD file contains all the data required for a game or application to run on a Wii console, including the executable code, graphics, sound effects, and other resources. For Super Mario Galaxy 2, its WAD file was essential for encapsulating the game's data in a format that the Wii could understand and execute.