Question: how to create hpgl file?
Answer: To save as HPGL files, from any program, do this. Go to Windows Printers, and Add Printer. When it asks to choose a printer, pick HP as the manufacturer, and the first one in the list should Hewlett-Packard HP-GL/2 Plotter. Install the printer, make sure it's not the default printer, and don't print a test page.