How to remove bars at sides of video thumbnails?

[a11]

I've been going through my videos and assigning nice thumbnails to them, however Windows 7 automatically adds these little bars on the left and right sides of the thumbnail. The only way I've found to remove the bars is to assign a thumbnail that's longer vertically than it is horizontally, but I don't really want to do that as it makes more sense to have widescreen thumbnails for widescreen videos.

Please note I am NOT talking about the common error of black bars at the top/bottom as a result of taking a screencap. See this image for what I am referring to: https://forum.videohelp.com/images/imgfiles/CNwfcwh.jpg

Does anyone know how to remove the bars at the sides?
Thanks

[DarrellS]

I found this on Google. It requires making a change to the registry.

http://www.askvg.com/how-to-customize-thumbnail-preview-border-in-windows-vista-and-7-explorer/

[a11]

I found this on Google. It requires making a change to the registry.

http://www.askvg.com/how-to-customize-thumbnail-preview-border-in-windows-vista-and-7-explorer/

Worked perfectly, thanks so much!

[DarrellS]

You're welcome