GUID based "system" profiles are deprecated. They are predefined Windows Media 8 profiles which you can reference by GUID only instead of building the entire profile from pieces. Windows Media 9 did not offer any presets so you are supposed to create an empty profile and add streams there settings them up.
There are no predefined system profiles that use the Windows Media 9 Series codecs. You can create your own Windows Media 9 Series profile by using a version 8 profile as a starting point. For more information, see Reusing Stream Configurations.
MSDN guides you in profile creation here:
The basic steps in creating and/or modifying profiles are:
- Create an empty profile, or load an existing profile to edit.
- Configure each of the streams, if required, based on supported profile data retrieved from the codec that will be used to encode the stream.
- Configure mutual exclusion, if needed.
- Configure bandwidth sharing, if needed.
- Set the priority of the streams in the file, if required.
You can find a code snippet here. It is C++, but conversion into C# would be pretty straightforward.