Anyone wanna explain how to us Magic ISO?

its just a tad bit confussing, and im trying to open the sims2 ccd files from a torrent i just dowloaded ans extracted. or however the process is it hard to explain. but i got stumped by the fact i didnt have a ccd filed opener(i usually do) but i didnt and i dont know the name of my old one. and everyone claims magic ISO is really good. but i have a slight problem, i dont know how to work it xD