hpg to dwg conversion is typically searched by users that are looking for best way to recover previously exported vector designs in HP's plotter documents (.hpg), ideally back to DWG format.
AutoCAD allows users to import .hpg files, but it is likely you will have to do a bit of work on the file and check it for any errors, before you can save it again in the DWG format.
Updated: October 24, 2023