winapi - WinRT and build-in Windows 8 Apps

Question

Can non-Metro Windows apps (ex: Explorer) be built with the new WinRT, or must they still be Win32 based?

Answer 1

I asked this during the 'Ask the Experts' session at //Build/. The answer was "Yes, within reason. Not all of the WinRT api's will function when called from desktop apps - for example any metro specific ones will fail. No explicit list of which ones work from desktop (non-metro) apps is available."

Edit: It appears that the documentation has been updated to provide a list of WinRT api's available from the desktop.