Thanks for the catch. For contests, it should not matter what runtime you use to develop your app as long as it is supported, will pass validation, and you follow all guidelines. See contest rules for details: http://appdeveloper.intel.com/en-us/developer-challenge-official-rules
Technical Support Team
Intel AppUp(SM) Developer Program
Intel AppUp(SM) center
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If you run into any issues using WPF please feel free post it here in the community forums. AppUp SDK integration is fairly straightforward (examples in SDK) and about the only issues people run into are threading related.