VS2012 - XDesProc hangs when Xaml file is opened

Question

In VS2012 whenever I try to open a xaml file (even in full XAML view) the XDesProc process keeps spinning and hangs visual studio. I tried killing it but it respawns.

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Answer 1

The "Source Code (Text) Editor" doesn't work for me.

Apparently XDesProc still decides to come up with every character I type. I have changed the permission of XDesProc such that "Everyone" is denied to read & execute to get it from starting at the first place.