Specify which file extensions display thumbnails?

[Patrick Bates (patrick)]

Trying to duplicate the behavior I used in Windows 10 where images and videos would show thumbnails but documents (txt, docx, pdf, etc.) did not. So far all the options I find appear to be all or none regarding the display of thumbnails.Is there somewhere, registry setting or otherwise, where I can specify the file types/extensions which show thumbnails?

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