A is a compressed version of a Wii U Disc (WUD) image used specifically for playing The Legend of Zelda: Breath of the Wild on emulators like Cemu . This format is essential for users looking to save storage space while maintaining a high-fidelity backup of the game. Understanding WUX vs. WUD
Once your base game is recognized by Cemu, you must install the official Wii U updates and DLC files (which are usually downloaded separately from your console setup) via Cemu's menu (). Troubleshooting Common BOTW WUX Issues "Key is missing" or "Game is Encrypted" Error
The Wii U emulator is the primary software used to play Breath of the Wild on Windows. Cemu natively supports WUX files, meaning you do not need to uncompress them back into WUD files to play the game.
Here’s what you need to know about keys.txt :
A WUX file is a proprietary archive format that shrinks massive 25 GB Wii U disc images (WUD) by removing "empty" space. Since BotW's actual game data is roughly 13–16 GB, the WUX format allows for significantly more efficient storage. Key Technical Aspects Compression: botw wux file
While Cemu can play WUX files directly, keeping your game in this format has two major disadvantages:
You can accomplish this using a community tool called or JWUDTool . These tools use your encryption keys to decompress and unpack the .wux image into the standard code , content , and meta folders. Once unpacked, you can easily install the latest BOTW updates (version 1.5.0) and DLCs via Cemu’s built-in file installer, allowing you to use graphics packs to push the game to 60+ FPS and 4K resolutions.
A specific alphanumeric code unique to Breath of the Wild (varying by region: US, EU, or JP).
When setting up Breath of the Wild in Cemu, you might encounter several formats. A is a compressed version of a Wii
| Format | Pros | Cons | |----------------|-----------------------------------|-----------------------------| | .wux | Small, loadable directly | Updates/DLC must be separate | | Loadiine | Mod/hack friendly, easy updates | Takes more space, many files | | .wud (raw) | Original image | Very large | | .wua (newer) | , single file + includes updates/DLC | Requires newer Cemu (v2.0+) |
You can now point Cemu directly to the U-King.rpx file found inside the code folder to play the game. This unpacked format allows you to easily inject mods into the content folder and seamlessly install game updates. Troubleshooting Common Issues Cemu Freezes on a Black Screen
There are a few different ways to run Wii U games, and understanding them is key to knowing why you would use a WUX file.
To get 60 FPS in BOTW from a WUX file:
Applying official game updates and DLCs to a .wux file is highly difficult. Cemu expects updates and DLCs to be in the extracted folder format.
A newer, highly efficient, compressed format that acts as a single file containing the game, updates, and DLC.
A common point of confusion for players is how to apply the crucial v208 (or latest) game update and the Master Trials/Champions' Ballad DLCs to a .wux file.
Here’s a concise breakdown: