Okay, I got it wrong, it's GCM, work for both GameCube and Wii clean ISOs, it doesn't remove anything just compresses them magically and should still work on modded Wiis etc and the new title of converted games comes out as
Super Mario Galaxy (USA).dec.iso
To reverse just run through the easy to use program again, you can add a whole folder or drag and from to batch convert
All credit goes to the creator who is known as LedZepperlin68? If any of the creators etc want this down I will delete the post.
Let me know your results please comparing. It's meant to be the new best way for Wii and GC
NASOSbeta2.rar