.DAT file is not the good extension of a 3D object for GP4 (eg : a car) but it's .gp4.
.DAT is the extension of the physical part of a track.
You can import .gp4 files in GP4Builder or Zmod 1.07b. No need to get specific filter if I remember well.
Then import your 3ds file into ZMod 1.07b then export it directly in .gp4 which is the right format for a 3D object.
Fo a car, take care at the name and order of the 28 objects which are mandatories to not get strange behavior or simply a crash of the game.
Look at the original cars or at any other car already released for more details
Edited 3 time(s). Last edit at 07/15/2015 01:56PM by gezere.