: When hardware acceleration is off, AutoCAD uses gdi16.hdi to process graphics via the CPU.
When functional, it’s invisible—which is good. When broken, it crashes AutoCAD mid-plot or throws referencing gdi16.hdi . autocad virtual device gdi16.hdi
Instead of using the Windows System Printer (which relies on gdi16.hdi), use a built-in AutoCAD driver like: DWG to PDF.pc3 AutoCAD PDF (General Documentation).pc3 These drivers use more modern HDI files (like ) that are significantly more stable. B. Clear the Plotter Cache : When hardware acceleration is off, AutoCAD uses gdi16
If you are seeing an error message related to gdi16.hdi in a modern environment, it is usually due to one of three reasons: : When hardware acceleration is off
