SerializerProvider serializerProvider = new SerializerProvider();
throws a System.UnauthorizedAccessException, trying to access registry key:
I consider this a bug, since a user mode app should be able to use Xps serializers without any rights elevation.
After googling some about this problem I found a few other reports. It seems to be related to windows 7 x64.
When using regedit as administrator, I cannot find that key in windows 7 registry neither in normal location nor in the 64bit mapping path.