Opening XML files of a Truck
Your truck mods are stored in the Media\Mods\
folder, which is created in the folder of the game in Documents\My Games\
.
The Editor uses the same Media
folder. Therefore, you can simply open the XML files from the source folders of the truck mods in the Editor (without copying anything to a different folder).
To do this, simply expand the Mods
folder in the File View panel of the Editor, locate the XML file of the mesh or the XML class of your truck, and double-click them.