wildfire4 config.pro option documentation for: PLOT_NAMES            

plot_names

yes,no

noogives plot files, except postscript plots, the extension plt.

yesogives all plot files descriptive extensions:

hpofor hewlett-packard

hp2ofor hewlett-packard hpgl2

calofor calcomp

verofor versatec

gerofor gerber photoplotters

psofor postscript (including color)