Sharing or downloading copyrighted WUX files of Breath of the Wild is illegal in most jurisdictions. The only legal way to obtain a WUX file is to create it yourself from a Wii U disc you own.
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) botw wux file
Here is the legal, ethical workflow:
| 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+) | Sharing or downloading copyrighted WUX files of Breath