Save the file as keys.txt in your Cemu folder (or wherever your Cemu settings.xml points to).

Most Cemu users simply download or extract games in :

Cemu requires specific decryption keys to play Wii U games that are in certain formats, such as or WUX . To set up your emulator properly, you need a keys.txt file containing the Wii U Common Key and individual Title Keys for your games. Understanding Cemu Title Keys