@Roger
May be it's like in CNEUR (Michel's reply in post n17) ?
The TYP files of CNEUR doesn't contain any polygon, polyline or POI but a very long DrawOrder list. So, all the polygons ( if they are listed in the DrawOrder) all the polylines and all the POI are displayed according to default settings of the rendering engine (i.e. Basecamp,Mapsource or the firmware of the GPS unit).