I maybe able to help you if you can tell me a better description not sure i understand your problem.
you have a plt. file you want to print
to print simply go to dos promot
and type "c:\copy *.*filename.plt"
or hpgl
hpgl is simply a printer setting you can modify through autocad
Doroteo Garcia Jr
Univ. Texas at Brownsville/ Ambiotec Civil Engr.