Hi Steven,
Is your question related with Store App development? I did not see it support windows store app in its FAQ, only win7 and win8 are supported, by the way I think you should ask them if win8.1 is in the list or not.
Windows 8 store app has its own gesture language, see this document:
http://msdn.microsoft.com/en-us/library/windows/apps/jj883700.aspx
Best Regards,
--James
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