Matrox NetworkAPIUPnPService is a software product for Windows developed by Matrox Graphics Inc.
It is reported that the following Windows processes are part of Matrox NetworkAPIUPnPService:
If you want to remove Matrox NetworkAPIUPnPService from your computer, just go to Start > Control Panel > Add/Remove programs and select Matrox NetworkAPIUPnPService from the list of programs.