sln file was not updated to VS2013 eventhough all the vcxproj were
Rename libcmyth project (project filename,  projectname and GUID only, not the name of the built library file or namespaces etc) to avoid it clashing with libcmyth_dll in the XBMC solution

On the XBMC side libcmyth was renamed to libcmyth_dll in the past but the actual vcxproj name is still libcmyth.vcxproj which was causing a duplicate project when adding pcvr projects into XBMC solution)
[mythtv] Includes projects in new windows solution