, specifically formatted for use with the backup loader.

Since the file is an archive (.rar), the "feature" you are likely looking for is the ability to apply DLC or game patches to a decrypted game folder without using official Nintendo servers. How to use this update file

To make this work as a feature on your Wii U, follow the standard file structure for Loadiine:

: Loadiine requires decrypted files. If your base game is in WUP (encrypted) format, this update folder will not work unless you decrypt the base game first.

: Open Loadiine GX2 on your Wii U and select the game. The update features (new characters, maps, or bug fixes) will be active upon launch. Important Notes