.3ds is a bit buggy at the moment and last worked properly in patch 3.1. Try converting to .x instead.
As for what formats of maps does DBPro support, well err....
open to read 1,"whatever.map"
and the rest is - well - complicated.
Most programmers write their own formats for each game to best optimise it, however there are plenty of 3D world editors that various forum members have written which may ease the pain of learning. 3D Map Editor, Mappy, Matedit and various others i've heard spoken of. personally I do my own, so I can't advise 'which is best'.
Pneumatic Dryll
