This is the most critical part of the process. While you could search online for pre-filled key files, downloading keys from the internet is often illegal and can be a major security risk.

Before a PC can read or play a game ripped from a Wii U disc, that game's data needs to be decrypted. Think of it like a digital lock protecting the game's files. keys.txt is essentially the instruction manual containing all the "key codes" for Cemu to open that lock.

Place it in the main Cemu root folder (where Cemu.exe is located). EmuDeck (Steam Deck/Windows):