The only previews I can see are of image files (JPG). I used to be able to view .DOC. PDF, TXT, etc. files. But no longer. I have tried ever remedy available on the Web, to no avail. I am running Windows 10.0.19045.2251. All prescribed settings are confirmed to be okay. TIA.
What does this mean, put an explorer screenshot of the whole explorer. Do all file and folder associations exist as should? are the explorer settings are still default or have you changed them?