That's the core idea behind Microsoft's Surface tablets but, as we saw with the Surface for Windows RT a few months ago, its ARM-based nature resulted in some substantial drawbacks.
Close behind is Microsoft's Media Player, with 38%, then QuickTime, with a distant 14% share. (Apple disagrees that its share is so low.) That, despite such gimmicks as a Disney promotion on boxes of Frosted Cheerios cereal giving away QuickTime software.