Do not download a 500KB keys.txt from a random Discord server. Here is the pro method to create a perfect file.
Use a tool like Cemui or Wii U Key Deriver to verify your keys. A single wrong character (e.g., 0 vs O) will break the entire file. Cemu stops reading at the first error it encounters. keystxt for cemu better
The file must be plain text. Rich text formatting (RTF) or Word documents will fail. Do not download a 500KB keys
Best for: Cemu users who want to play decrypted/dumped Wii U games without launch errors.
Not for: Piracy – keys.txt alone doesn’t give you games. The file must be plain text