Even if I knew how to import that format if you took them from another game, I couldn't tell you. Which I have never heard of that file format before. What's the point of designing your own game if you steal all the models from another game?
Jonas
Focused, hard work is the real key to success. Keep your eyes on the goal, and just keep taking the next step towards completing it. If you aren't sure which way to do something, do it both ways and see which works better. - John Carmack
I always stealed content from games. And I think that no, it isn't illegal to steal the content. Istead it's highly illegal to redistribute the contents of a commercial game or, worse, to use them in another commercial project. Anyway for developping purpouses or for amateur development I think you can enjoy the art of "hack and rip" a millionaire commercial game...
Well, in my humble opinion; teaming up with other skilled people or expanding your own skills is the way to do it. Don't steal, but make the content to perfectly fit your game is best I think.