Wii U Disk Image File
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What is a WUD file?
WUD files are most often created using Homebrew for Wii U. A user dumps the the game information from the Wii U game to the WUD file. Since the game information is large in size (over 20 GB), multiple WUD files are created to store segments (around 2 GB) of the game. Therefore, the files must be merged into one WUD file before the game can be opened and played by an emulator.
To open a WUD file in Cemu, select File → Load and choose the WUD file you want to open.
Common WUD Filenames
game_part1.wud - The first segment of a Wii U game dump.
game_part2.wud - The second segment of a Wii U game dump.