Before fixing the error, it is crucial to understand the technology behind it.
In plain English: gdi16.hdi is a very old (16-bit) driver file that allows AutoCAD to talk to Windows’ basic graphics system (GDI) to display 2D linework and simple raster images. It is the "fallback" virtual device when no proper hardware-accelerated driver is available. autocad virtual device gdi16.hdi
Sometimes the file is simply corrupted. Download a fresh copy (from a trusted source or an old Autodesk installation disk) and replace it: Before fixing the error, it is crucial to
Note: On modern Windows, even a healthy gdi16.hdi will often fail due to the 16-bit block. This method is a long shot. In plain English: gdi16
Users often encounter crashes, errors, or missing HDI messages related to this file when: