Forcing filter manger to attach to third party network redirectors

Hello,
I am working on a mini filter and I would like to filter file operations happening on a third party network redirector. Currently filter manager is not layering itself on top of this redirector and I am assuming that it doesnt layer because it simply is not aware of this redirector. Is there any way to tell filter manger to layer itself on top of this redirector. I am getting a feeling that I am missing something obvious but cant seem to find out what. If anyone can help I will be greatful.
thanks
-Kiran