Gamecube/wii emulator

im trying to play pikmin2 on my pc,but evertime i try to load the iso,it tell me that an extensions are missing.does anyone know wht i need to make this program( dolphin 3404) work

-are the games extracted from the folders they came in?-Do they end in .iso or .gcm (for gamecube)?-is it the right version for your pc?
(32bit and 64bit versions-find out what your pc is and double check-my laptop runs the 32 bit version).

Replying to #2

yes its the right version for my pc,its 64bit. and they end with iso.i dont think its the iso it self,i think im just missin some plugins.