The msdfmap.ini conatins the datasource definitions for RDS (Remote Data Service) Its part of MDAC which is part of IIS. If your're not using it I wouldnt be terribly frightened of it, but I've never really used it myself. It uses ADO's so perhaps some crafty individual could abuse some database commands but, likeI said if your not using it I think you're fine. Anyone feel free to correct me if I'm wrong, this is just off the top of my head about something I dont know much about.

-Maestr0