well, after searching for some way to do it, i have conluded you cant. .pdr files have a lot of differences with 3ds files and the particualr pdr files i am trying to convert; i.e. the pdr files i am trying to convert move, react when the cars of the rollercoaster approach them and they have built in sounds, and to my knowledge 3ds files dont do that kind of thing. i was just trying to get some of the props from UR/URCD/URDC into NL since the UR props are really cool.