Vimm's Lair: The Vault
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Restoring discs with NKit

Wii discs are often stored in .wbfs format which saves space by removing junk data. NKit accurately restores that junk, converting the wbfs file back to a Redump iso. NKit also introduces a .nkit.iso format which is ideal for GameCube gaming on consoles, plus it's fully restorable to iso using NKit.

To restore the disc NKit needs a copy of the update partition (for most games) but happily there aren't too many of them. You can grab a copy of NKit with all the partitions you'll need below.

Downloads (Windows, Linux + Mono)
NKit 1.4 (604KB) - The core NKit app. Some assembly required.
NKit 1.4 + GameCube Recovery Files (5.81 MB) - Includes recovery files for GameCube games.
NKit 1.4 + Wii Partitions (3.89 GB) - Includes update partitions for US Wii games.
NKit 1.4 Fully Loaded (14 GB) - Includes GameCube files and Wii partitions for all games worldwide.

Run NKitProcessingApp.exe to get started.

Learn more about NKit at GBAtemp or GitHub.