Sorry it took me some days because I had to work for a client.

So back to the problem.

Thank you Cowabanga for your help but your Solution creates a new problem.
Model opened in MED and Saved as MDL7.
Imported in WED scaled etc. Build Level and Run.
First I got an error with Bad Scale Value.
After that I resized the model and I didn´t get any errors but there´s no model in the scene. I can walk on the terrain but I can´t see it.
Any Ideas about this issue?

Thanks,
Masterchief JB