Thumbnails of mp4 files doesn't show up in win explorer

[sono]

For a while thumbnails of mp4 files in the file explorer doesn't show up. Where can you reset this function so I can see them again?

 

[diz]

Control panel -> Folder options -> View Tab:
- Disable 'Always show icons, never Thumbnails'
- Disable 'Display file icon on thumbnails'

If you still don't see thumbnails, you can try install K-Lite Codec Pack ( Download K-Lite Codec Pack ) . After installed execute : 'Codec Tweak Tool -> Miscellaneous -> Thumbnails' and enable all options there.