one more uncertain point is on which part winrt is built. wikipedia article (and many other sources) say that it is directly buit on the windows native api, hence no dependency on win32. this is also how wpf was built.
however this blog post states that winrt is nothing but a layer on top of win32: http://blogs.microsoft.co.il/blogs/sasha/archive/2011/09/15/winrt-and-net-in-windows-8.aspx
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