Cemu is a fantastic emulator for playing Wii U games on PC. To play games on Cemu, you must have a keys.txt file. This file contains the cryptographic keys needed to decrypt and load your games.
Depending on how you installed Cemu, the location of your keys.txt file varies. If it doesn't exist, you can simply create a new text file named keys.txt in the correct folder. keystxt for cemu better