I recently had a problem: In developer mode does not load file .aiw and the game crashes. Delete the file and all is well, but only the car falls not there )) In a single, this is no problem. there was never. This file was created in BTB. Only asked for help I got the answer!!! By trial and error to find out going long )) And yet what files together do not keep the file .aiw ??? to me they were all in the same folder (I'm so comfortable)
With no AIW file - the car defaults to 0,0,0 location.. if you have no geometry at that location for the car to fall onto it will fall forever. As for AIW crashing - anything i have taken from BTB works perfectly in devmod. (you can copy the file directly from your RF1 folder to your RF2 (track/track) folder.
