: Windows attempting to pass a drawing file to a mismatched version of the AutoCAD launcher executable. Step-by-Step Troubleshooting Methods
"Had this issue after an update. The 'Repair' option didn't work, but a clean reinstall with my antivirus turned off (per these steps) fixed it instantly. Definitely use the Browser Download method!" Problem Loading acadres.dll Resource File (Opening F/X CAD) problem loading acadres.dll resource file autocad 2021
This is the most common and reliable fix. : Windows attempting to pass a drawing file
If the problem persists, ensure your Windows 11 is fully updated, as AutoCAD 2021 is compatible, but requires recent system updates. as AutoCAD 2021 is compatible
C:\Program Files\Autodesk\AutoCAD 2021\