NKit 1.4 is a specialized Nintendo ToolKit designed to shrink, recover, and preserve Wii and GameCube disc images
for %%f in (*.iso) do (
NKit.exe Convert "%%f" "%%~nf.nkit"
)
For more information on Nkit 1.4 and Wii game partitions, check out the following resources: Download Nkit 1.4 Wii Partitions
NKit 1.4 Fully Loaded: The comprehensive set including worldwide Wii and GameCube partitions (~14 GB). How to Use Wii Partitions for Recovery NKit 1