WUP files are the native package format used by the Wii U for installing games, updates, and DLC. Unlike standard .wud or .wux disc images, WUP files consist of a folder containing several .app , .h3 , and metadata files (like title.cert and title.tik ). Installation on Wii U Hardware
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If you download a "Wii U WUP ROM" from an archive, you will likely not see a single file. Instead, you will see a folder containing dozens of small files. Here is what those files are: WUP files are the native package format used
However, Cemu does not use raw WUP files directly. It requires a or keyed format. The Launch: Insert the SD card into the Wii U