FS2004 default mesh

I have a particular problem with the mesh in FS2004 where it breaks through the Lago Terramesh. I am using the Visual Flight Photographic Scenery.I have used the Scenery Reference from the FS SDK and have written a C++ program to investigate all BGL's in the default EURW directory which overlap the limits of the VFR scenery meshes.I have identified files in the default scenery which overlap with the VFR scenery and which do not have VOR, Object, Library, Facilities, ADF or Dynamic data. You can see the results at:http://www.visualflight.co.uk/forums/topic...946&whichpage=2However, these include coastlines as well as meshes so that outside of the VFR scenery area, eg Scotland, the coastline tiles are missing.Could anyone tell me how I can identify which files contain only terrain mesh?George