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Metro style apps can use a subset of the Win32 and COM API. This subset of APIs was chosen to support key scenarios for Metro style apps that were not already covered by the Windows Runtime, HTML/CSS, or other supported languages or standards. The Windows App Certification Kit ensures that your app uses only this subset of the Win32 and COM API.
http://msdn.microsoft.com/en-us/library/windows/apps/br205757.aspx
http://msdn.microsoft.com/en-us/library/windows/apps/br205757.aspx
