Modular Synth Panels

I've always wanted to use the HPGL import in FPD. Unfortunately I
know very little about HPGL or .PLT files (aside from what Wikipedia,
etc. say).

  My wish is that someone can tell me in idiot terms how to do this. I
am using Windows XP. What free program should I use to create/export
this file type? I tried installing an HP plotter driver and saving to
file instead of a printer. I could create the files but they don't
show up in FPD or maybe they are so tiny I can't see them?

  Full details, step by step, good search words, anything would be
helpful at this point.

Thanks,
p.