How to disable thumbnails icon preview only for video files in Finder? I hate my finder opening slow because of loading all those icons for video files. While I still want thumbnails for PDFs, documents, music, I don't want previews for video files because they're useless anyway (most of them are simply black but take time to load).

I managed to do it on previous OS X versions but on my Mountain Lion I can not locate /System/Library/Frameworks/QuickLook.framework/Resources/Generators/ folder where I was able to delete generator for video files in the past.

How to turn video icons preview thumbnails off?
The Mountain Lion default QuickLook generators can be found in the folder /System/Library/QuickLook/ .