Many unofficial sources provide pre-made key.txt files, but these are of questionable legality.

The Cemu team has been actively moving away from external key files. As of version 2.1, the emulator prefers (which are self-contained) or a keys.txt stored in a portable structure. There is even experimental support for loading keys from an online database.

on a modified Wii U to dump keys from your physical discs or digital installs to your SD card. Common Key NandDumper to extract the file from your console, then use a hex editor like to find the common key at offset 0xE0 ~ 0xEF Where to Place the File The location of varies depending on your operating system and setup: Windows (Standard) : Place it in the root folder where is located. Windows (AppData) : In newer versions, it may be found at %APPDATA%\Cemu\keys.txt EmuDeck (Steam Deck) : Usually located at Emulation/bios/wiiu/keys.txt or within the emulator-specific folder at %USERPROFILE%\emudeck\EmulationStation-DE\Emulators\cemu Formatting the File The file must be a plain text file ( ) with one key per line. You can use a to add comments for organization:

00050000101C9300 = a934228c4536a053ab78fe6b6fc87678