If you are looking to play the game on a PC, you would use a rather than a GameCube ROM. Dolphin Emulator
A knowledgeable reader might ask: "Can't I just run the Wii version on Dolphin emulator and map the controls to a Gamecube-style controller?" The Legend Of Zelda Skyward Sword Gamecube Rom
This article will serve as a definitive guide to understanding why this ROM cannot exist, how the myth started, what you are actually downloading when you search for it, and the legitimate (and superior) ways to play Skyward Sword today. If you are looking to play the game