KEY_CURRENT_USER\Software\Autodesk\AutoCAD\R19.0\ACAD-B001:409\Profiles\your profile\Dialogs\Select File - PreviewVisible =1 Check that next key in the registry is setup = 1: This is a tip from a customer with the same problem: Would that be the same thing? Will this affect the ability to see previews in Windows Explorer? Because while I can see the previews even in explorer, she can't see them anywhere.
I looked at my registry and I'm finding ACAD-B005:409, not ACAD-B001:409. The user having the problem is out today, so I'll have to wait 'til Monday to have her try it.