can you list down the steps for me please? and i have looked into the vehicle.cs and i cannot find the vehicle's dts file:(
The dts file is not in the cs file. Hence dts file. It has it's own separate file in the add-on called Whatever.dts. And you can't open dts files. Nor import them.
Someone should totally write a dts im/exporter for blender 2.7.
Not sure if it's going to work for 2.7, but... http://forum.blockland.us/index.php?topic=256031.0