Thumbnails for video files in Windows 7 contain a film strip overlay on the sides which consumes part of the thumbnail image. If you need to remove the video sprockets / film strip effect, there is a registry setting you need to change.
Click Start, type regedit.exe and press {ENTER}
Navigate to the following key:
HKEY_CLASSES_ROOT\SystemFileAssociations\video
In the right-pane, double-click Treatment and set its value data to 0.
Here are the possible values…
| Data | Effect |
| 0 | No Adornment |
| 1 | Drop Shadow |
| 2 | Photo Border |
| 3 | Video Sprockets |
For more details, refer to section "Thumbnail Adornments" in this MSDN documentation.
Exit the Registry Editor.
Logoff and log back in to your account. Filmstrips are now gone!
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Thanks for this bit of information. Now I know how to put them back.
Cool. Wish there was a way to change the horrible angled folder thumbnails back to the XP style flat previews.
This worked on windows vista too. I did not need to log out/in. The change happened as soon as I closed the popup dialogue double clicking treatment gave.