How to change file preview in Finder?

So I just finished my latest short film, and I exported it to Finder. However I don't like the preview Finder chose for my video, it simply chose a random frame from my video and made that the preview of the file. I have a custom poster I made for the video I would like to make the preview of the file. I've look at other websites and they all mistook "preview" for icons. I am not talking about the icon of the file, I am talking about the actual preview of the file. If you open the Info pane of an image or a video file, there will be a tab under "Open With" named "Preview" and shows the preview thumbnail for the file. Can anyone tell me how I can manually change the preview of a file? I thought about importing the video into iTunes, change the cover art and take it out again, however because the file is encoded with Apple ProRes 4444 iTunes won't accept it and even if it did it would have been converted to other format, which is something I am trying to avoid and I would like to keep it ProRes 4444.

Hi!
I'm not sure how to change the preveiw icon, but if you're just looking for a quick way to change the icon preview of that particular file you could always change the the icon from the finder get info window:
http://support.apple.com/kb/ht2493
Hope this gives you a temporary solution until you find what you're looking for.

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