The Wii U operating system (IOSU) uses a set of asymmetric and symmetric keys to encrypt game data. When Cemu loads a game, it must decrypt this data on the fly. The keys.txt file provides Cemu with these decryption keys.

Cemu 2.0 introduced the .wua (Wii U Archive) format. When you convert your game to .wua, you embed the key directly into the file. This means you don't even need keys.txt for those games anymore.

| Current Cemu | With keys.txt feature | |--------------|--------------------------| | Manual GUI entry per game | Drag & drop keys.txt once | | Keys lost on reinstall | Portable across copies | | No missing-key detection | Highlight missing keys | | No offline batch import | Bulk import from file |

---