Nintendo protected Wii U game discs and digital eShop downloads using proprietary AES-128 encryption. When you try to boot raw or compressed dumps—such as .wux (compressed discs) or .wud (raw disc images)—Cemu must decrypt the data in real time.
keys.txt.txt (hidden file extensions are a common problem). File Structure Example
The format of the key inside the text file is wrong, or the specific key for that game is missing. Cemu Keys.txt
The keys.txt file is malformed—perhaps saved with the wrong encoding or containing non‑hex characters.
If you want to completely bypass the headache of keys in the future, consider converting your games into the raw, decrypted Loadiine format or using tools to unpack your .wux files prior to loading them into Cemu. Nintendo protected Wii U game discs and digital
Without the correct keys, Cemu will throw an error, typically stating that the game is encrypted or that the key is missing. 2. Where to Place keys.txt in Cemu Cemu looks for the keys.txt file in its main directory. Open your Cemu folder.
That means the keys.txt file should be placed directly inside the root folder where Cemu.exe resides. Not inside a subfolder like “keys” or “resources”—just right alongside the main executable. File Structure Example The format of the key
Once you have legally obtained your keys.txt file, you need to place it in the correct directory for Cemu to recognize it.
The proper file directory depends entirely on your operating system and the frontend launcher you use. 1. Standard Cemu on Windows (Portable Setup)
A master key (like the Wii U Common Key) required for the emulator to understand the file system. Title Keys: Specific codes for individual games. Modern Formats: Newer file formats like
# Cemu keys.txt - Minimal example # Format: Title ID (16 hex) | Title Key (32 hex)