Windows has an annoying habit of displaying thumbnails for folders that you may not want thumbnails for, like the My Pictures folder. For me, it’s better to have the My Pictures folder viewed in List or Details view and all of the folders underneath My Pictures to be shown as thumbnails. 
The really annoying thing is that even if you go to Tools, Options, View, and click on "Apply to All Folders", Windows may still revert back to thumbnail view! This happens because Windows will show a folder in thumbnail view if it finds a THUMBS.DB file in the folder.
THUMBS.DB is a cache file that basically is used by Windows in any folder it finds a picture or video so that the next time you view the folder, the thumbnails will be loaded faster so you don’t have to wait. However, with the current speed of computers, it’s pretty useless and only takes up more space on your computer.
Disabling Thumbnails
You can delete the file and the thumbnail view will go away, but only for some time before Windows re-creates it. You can prevent this from happening by disabling the thumbnail cache in Folder Options or via a registry hack.
In Explorer, go to Tools, then Folder Options and click on the View tab.

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