I can't find the exact reference I used, but here are some that are similar:

* http://clintboessen.blogspot.com.au/2011/03/convert-octet-string-into-readable.html
* https://groups.google.com/forum/#!topic/microsoft.public.scripting.vbscript/c-_nKNg0yw8

It could be that this is something specific to Windows, however in the testing that I did the GUIDs were rendering correctly.