I use a script from ventilator to export models from blender.
Here is his initial post:
http://www.opserver.de/ubb7/ubbthreads.php?ubb=showflat&Number=209129&page=1

and here the file of the second link which had changed a bit since the first version:
http://user.schule.at/go/export_gs_map.py


From the acklogs:

#1 with the 'broken' wmb file
Quote:
Log of A7 Engine 7.82.1 run at Mon Jan 25 15:11:18 2010
Achim on Windows NT/2000/XP version 5.1 Build 2600
Options mg1.c -nx 30 -diag
[...]
Running MG1.C.
14 objects
Main started at 3.319
def_startup started
mtlfx_startup started
D3D_Init Window: 1024x768 -> 1024x748 failed
D3D_Init Window: 800x600 -> Window: 1x800x600x32
Video memory found: 266 MB
Main loop at 3.378...
Server started at 3.379
Client started at 3.386.
1st frame with 266 MB at 3.388
LevelInit at 5.243
194 entities 0 cameras 0 lights 0 sounds 0 paths
0 lmaps 1 textures 1 meshes 12 faces
Physics restarted
Nexus overflow at 30285784
7 entities 0 cameras 0 lights 0 sounds 0 paths
0 lmaps 0 textures...ok
LevelReady at 7.026


#2 without the 'broken' wmb:
Quote:
Log of A7 Engine 7.82.1 run at Mon Jan 25 15:15:53 2010
Achim on Windows NT/2000/XP version 5.1 Build 2600
Options mg1.c -nx 30 -diag
[...]
Running MG1.C.
14 objects
Main started at 3.368
def_startup started
mtlfx_startup started
D3D_Init Window: 1024x768 -> 1024x748 failed
D3D_Init Window: 800x600 -> Window: 1x800x600x32
Video memory found: 266 MB
Main loop at 3.401...
Server started at 3.402
Client started at 3.402.
1st frame with 266 MB at 3.402
LevelInit at 5.489
193 entities 0 cameras 0 lights 0 sounds 0 paths
0 lmaps 1 textures 1 meshes 12 faces
Physics restarted
Nexus overflow at 30285416...ok
LevelReady at 7.082
Normal exit at 16.263
[...]

(only difference is after 'Physics restarted'):
Quote:
Nexus overflow at 30285784
7 entities 0 cameras 0 lights 0 sounds 0 paths
0 lmaps 0 textures...ok
LevelReady at 7.026