flv, mpg, wmv, mp4 video thumbnails missing in Windows 10 file explorer

[postcd]

Hello, i thought this did not happen before but now it started to bother me.
In File explorer in Windows 10 i have set Thumbnail view, but i see thumbnails of a webm and gif, but not flv, mpg, wmv, mp4 video thumbnails

Please any ideas how to fix it?

UPDATE: this worked:

1. From start menu choose All Programs.
2. Click K-lite Codec Pack folder. (or start typing "codec" while start menu is open)
   
3. Click Codec Tweak Tools folder.
4. Open All options.
5. Click Thumbnail Settings.
6. Select the file types for which you would like to display thumbnails or click Select Windows default.
7. Click Apply & Close.

source

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