Use either Cfg USB loader (thats the one i use), USB loader GX or WiiFlow. GX is the one thats closest to a system menu lookalike, I have not had much success myself with wiiflow but i know some people swear by it. For me its alwatys been CFG USB Loader, its got plenty of options, relatively easy to set up and Yes it does support Gamecube Games thru Dios Mios, Devolution or Nintendont (Thats the one i use again). If you have any trouble setting up CFG then i am happy to help you