Thumbnails for file icons

iTunes movies have a nice thumbnail when looking at the files through the finder. See below:

Screenshot
Could you tell me how I could make my own thumbnails for other files? When I click 'command I' to get to the properties of one of the files above, the file icon is still a generic quick time icon, so this doesn't seem to be a simple file icon copy-paste issue, see below:

Screenshot 2
mpaertAsked:
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nxnwConnect With a Mentor Commented:
In fact, it is a simple file icon copy-paste issue.

Copy the desired image, click on the icon at the top left of the get info window, and paste. Done.

The Mac OS has done this since forever, going back before OS X.
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mpaertAuthor Commented:
Ok, thanks. Could you tell me how the image has to be formatted (type, resolution, aspect etc), so that it could be pasted in there?
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nxnwCommented:
Any image will paste in there and will automatically cropped and scaled.

Icons are square, so the aspect is 1:1. I think icons will display as large as 512 x 512 (pixels). It might be optimal (but I am not sure) to stick to powers of 2 (i.e. 64, 128, 256, 512).
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