F1 2010 3dsimed and car model help

[d16c]

Hy guys!
I need help, i open 3dsimedit and import a car pssg car modell file but i only see a grey box and a 3dsimedit window and quick bar.
So i export this file a gmt(rft) file. Around a 60-70 gmt file. Now i can find a car model and i modify it but HOW TO RECONVERT A PSSG FILE?
Or another chance to open a pssg car model?

 

[ML2166]

You can't re-convert a modified model back into PSSG format.