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.
Recommendation:
A BOTW WUX file 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 botw wux file
Wii U game discs have a fixed storage capacity of 25GB, regardless of how much data the game actually uses.
WUD (Wii U Disc): An uncompressed 1:1 raw copy of the original disc, which is always roughly 23.3GB to 25GB in size. A BOTW WUX file is a compressed version
WUX (Wii U Compressed Image): A compressed version that removes the "empty space" from the WUD file. For Breath of the Wild, which is roughly 13GB of actual data, a WUX file can significantly reduce the storage footprint on your PC compared to a full WUD image. How to Use a BOTW WUX File with Cemu
To run a WUX file in Cemu, you must ensure the emulator can decrypt it. Unlike uncompressed "Loadiine" folders, WUX and WUD files are encrypted and require specific AES keys to function. uncompressed disc image. | 1:1 backup
If you are trying to play the game on the Cemu emulator:
To keep things clear, here is a quick comparison of the three main formats you will see for BotW:
| Format | Description | Pros | Cons | | :--- | :--- | :--- | :--- | | WUD | Raw, uncompressed disc image. | 1:1 backup, untouched data. | Huge file size. | | WUX | Compressed disc image. | Smaller size, single file, easy to store. | Requires extraction for some mods. | | Loadiine (Folder) | Extracted game files. | Best for modding; easy access to individual files. | Takes up space on drive; messy to look at. |
Once extracted, you will get a folder structure that looks like this: