Technically, the keys.txt file serves as a repository for the cryptographic keys required to decrypt Wii U software. The Wii U, like most modern consoles, utilizes robust encryption to prevent unauthorized copying and execution of games. When a user loads a game into Cemu, the emulator cannot simply read the data; the data is locked. The keys.txt file acts as a master keyring, containing the specific decryption keys needed to unlock the game files so they can be read and executed by the emulator. Without this file, Cemu is essentially a shell—capable of emulating the hardware architecture but unable to run the software designed for it.
: A 32-character hexadecimal key followed by a # and the game's internal Title ID. Cemu Keys.txt
DLC and updates have their own title IDs and require their own keys in keys.txt . You need to add them separately. Technically, the keys
The location of the file depends on your operating system and how you installed Cemu: The keys