In case you have an older version of MED, I recommend to use that to export to fbx, and use the free fbx-converter of Autodesk to convert it to obj, that you can import in blender.

http://www.puppenheim.org/
http://www.wuerfels-welt.de
Old Game Tutorial: http://www.puppenheim.org/MITutorial.zip
Free Game Editor: http://puppenheim.org/AlienalsWeihnachtsmann.zip
http://www.puppenheim.org/blender_starting_main_settings.txt