Unzipping Sims Game

Hello Just had a quick question for anyone that can help me. I just downloaded expansion pack The Sims Livin Large. I have the software to unzip it i just am not sure what file to sent the information too. Can someone help me out? Is there anything else i need to know before doing this?? Thanks to anyone who can help me out.

are you sure that its not an iso already? my winrar shows the icon for iso's too, if its an iso just get daemon tools, mount it, and your ready to go