Are you using MapPoint 2006, or the MapPoint Web Service? If it is the web service, there is a function to handle convert to lat/long which is pretty nice. Once you save a map off in MapPoint 2006 (or earlier) there's not really any way to reference it again from within the COM interface, it's just a gif without a bounding reference. Perhaps someone else has done a hack to workaround this, but I don't know of anyway to do it.

Mark M - MSFT