I am embroiled in modifying my definitions file (the UG_English.def anyways) and I believe I have been sucessful at only confusing myself.
It all started with the print function......
I have the adobe acrobat distiller as one of my printing options (not PLOT). I have been successfully making PDF's with this (more or less), but I need the line weights to all be kicked down a notch. So, I thought the reasonable thig to do was to modify where the pen weights are defined. After some brief poking around I found a section in the UG_English.def file that had to do with setting the Thick, normal and thin weights and their respective english and metric sizes. Well, I just halved all the values - shut down and restarted unigraphics (NX2) and when I reprinted - Viola! - the PDF is even THICKER and totally illegable. I went back and pasted in the original values (I pasted them to a .txt on a notepad on my desktop) and it had no effect - still thick and terrible. I couldn't get what I had back. Gone, all gone.
Well, at that point I thought it might be high time to join a UG forum and - here I am.