It has been my experience when exporting an object from KP, I type the following in the command window:  objout xxx with the x being the name of the file I wish to give the object.  If the object that is created has multiple parts, the program exports an obj file for each part and automatically numbers it.  However, the numbering starts with 0.  So if I have a 3 part object, I would get something like this:  test001a0, test001a1, test001a2.  I find typing objout in the command window works the best for me. Hope that helps.