To use a WUX file, you generally need two things: the file itself and the "keys.txt" file for Cemu. Every Wii U game has a unique "Common Key" and a "Title Key" required for decryption. Cemu cannot read the WUX file unless the corresponding keys for Breath of the Wild are added to the emulator’s configuration folder. Without these, the emulator will simply display an error message stating the game cannot be launched. WUX vs. Loadiine (RPX)
If CEMU fails to load the game, double-check that your keys.txt is correctly formatted and placed in the right directory. CEMU will typically show an error message indicating a decryption failure if the keys are missing or incorrect.
The .wux file format is an efficient, lossless compression of the BOTW Wii U disc image, optimized for use with the Cemu emulator. It offers significant space savings and solid performance while preserving all game data. However, its use is niche to Wii U emulation and requires external decryption keys. For end users focusing on BOTW modding or preservation, extracting the .wux to a loadable folder may be necessary, while casual emulation benefits from direct .wux loading.
JWUDTool requires to run. If you‘re experiencing extraction failures: botw wux file
Standard WUD files are read-only. If you want to install the latest update (e.g., version 1.5.0) or The Master Trials DLC, you must load separate update files. With a WUX file setup in Cemu, you can install updates and DLC directly into the emulator’s memory, leaving the original compressed WUX untouched. This keeps your game folder clean.
.WUX files strip away that "empty" space, shrinking the file size down to just the actual game data while remaining playable. How to Use a .WUX File in Cemu The Legend of Zelda: Breath of the Wild (BotW) running, follow these essential steps: Obtain the Decryption Key
The RPX folder structure allows Cemu to access individual game files instantly without having to decompress a disc image on the fly. More importantly, installing official game updates and the DLC packs required for a complete BOTW experience is significantly easier and more stable when using the extracted folder format rather than a monolithic .wux file. How to Use a WUX File in Cemu To use a WUX file, you generally need
To play Breath of the Wild using a WUX file, you typically have three paths:
You can achieve this by using a community-developed tool called or WUDCompress .
For example, while The Legend of Zelda: Breath of the Wild fills up a large portion of a disc, a BOTW WUX file will be significantly smaller than 25 GB, saving valuable hard drive space. How to Use a WUX File in Cemu Without these, the emulator will simply display an
Massively bloated file size (22+ GB); requires a decryption key; highly inefficient for modern PC storage. 3. Loadiine / Raw Files (RPX/Folder Format)
Retail Wii U game discs dumped directly from a console result in a .wud (Wii U Disc) file. Because physical Wii U discs have a fixed capacity of 25 GB, a .wud file is always exactly 25 GB, even if the game data only occupies a fraction of that space.
Once extracted, you will get a folder structure that looks like this:
To convert your WUX file into a standard WUD file, or to fully unpack it into folders, you can use a community tool called . Download Wudict (a command-line utility for Wii U images).