Your favourite band releases a live recording on its Web site, but iTunes can't play it. Your friend sends you a link to an irreverent political spoof, but QuickTime Player can't open it. With so many Windows-centric files floating around the Internet, it's easy for Mac users to feel left out. But with the right software - most of which is just a free download away - you can play almost any file your Windows-using friends throw at you.
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