Before WUA, managing a Wii U library was a chore. To play a game like Mario Kart 8 properly, you needed the base game files, a separate folder for the update data (often version 1.10 or higher), and another folder for the DLC packs. Loading these required pointing the emulator to three different locations. WUA simplifies this. A WUA file can contain the base game, the latest update, and all available DLC in one single package. When you load the file in Cemu, everything is recognized instantly.