If you are playing on an original, modded Wii U console using custom firmware (like Aroma or Tiramisu), the console's native installer packages (WUP Installer) require files to be in the NUS/WUP format to install them to the Wii U system memory or an external USB hard drive. Therefore, you should keep your files in WUP format for console installation, but use WUA for your PC and handheld emulation needs. Conclusion
allow you to rip your own Wii U discs and digital purchases directly from a Wii U console. Steam Deck / EmuDeck
For performance, Cemu users often run titles like Paper Mario using the to ensure the smoothest 4K output.
, providing a lossless, unified file format designed specifically for the Cemu Emulator . Traditionally, emulating Wii U titles required managing a messy maze of raw folder structures, encrypted disk images, and separate directories for update files and downloadable content (DLC). The Wii U Archive (.wua) format compresses and bundles everything into one clean package.