I'm 99% sure they used to show screenshots of whatever the videos are.
Now they just show the orange traffic cone icon, which I think is because I use VLC as my media player.
Why did File Explorer stop showing appropriate thumbnails for my mp4 files?
winver shows Version 20H2 (OS Build 19042.1415)
1 Answer
Windows 10 does show icons for videos (on a PC I use with slightly later version than yours), depending on the view. If you need to turn on that feature, under View | Options | Change folder and search options, on the View tab, be sure Always show icons... is not selected.
In Windows Explorer, choose large, medium or small icon view (by pressing CtrlShiftn, where n is 1, 2, or 3). Voila! Thumbnails are displayed. However, in other views, e.g., Details, only icons show.
Caveat: If the folder has not been opened lately, and thumbnails have been cleared, it may take a few seconds to regenerate each of those images. If there are many files, you can watch the flow of icons changing to thumbnails.
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