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Depending on how you installed Cemu, the keys.txt file might already exist, or you may need to create it manually. Step 1: Check your Cemu Folder cemu emulator keys.txt
Each line is a hexadecimal string. The part before the # is the title key; the part after is a human-readable comment identifying the game. I can provide targeted troubleshooting steps based on
Raw disc dumps formatted as .WUD or compressed .WUX files. These are completely encrypted and will not launch without keys. the keys.txt file might already exist
You may have updated CEMU. Ensure the file is still in the correct folder. Also, check that no antivirus software quarantined or altered the file (antivirus rarely targets .txt files, but it can happen).