Blend File Preview in Operating System.

I have been using blender for a few years now, and I would like to be able to display the most recent render image as a icon for the blend file preview in the operating system, instead of the default blender logo. I am looking for a automated solution, because I the number of blend files I have is quite large.
Example:
http://img413.imageshack.us/img413/8051/previewsk.png

It would be really great to get a reply to this help would be appriciated.