Gamecube and Wii both encode the disks backwards from a standard DVD, among other physical incompatibilities. A tiny handful of PC DVD drives can be coaxed into reading them, but for the general public, it is far simpler to run CleanRip on your Wii and make a dump that way. It’s pretty easy, I’ve done my whole…

“rip them to PC, and then use those disc images on the emulator” What about putting the original discs in a PC’s DVD-ROM drive???