Go to Config -> Paths and under "ISO Directories", click the "Add..."-Button, select the folder where your dumped games are and then add it. Click "OK" and then the list should refresh and the game would show up.
Now you can do a rightclick and do your stuff.
An GC/Wii ISO is different than a CD or a DVD ISO. WinRAR (and other programs) assumes the latter one and so, it doesn't regonize it. Windows only open programs based on their extensions and not what the actual format is.
Dolphin reads it like a GC/Wii ISO and so it doesn't have any problems with it.
Now you can do a rightclick and do your stuff.
An GC/Wii ISO is different than a CD or a DVD ISO. WinRAR (and other programs) assumes the latter one and so, it doesn't regonize it. Windows only open programs based on their extensions and not what the actual format is.
Dolphin reads it like a GC/Wii ISO and so it doesn't have any problems with it.