dynamic image (png) file

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I've recently seen a couple of sites that have dynamically generated .png
files on them and I'm wondering how to do it in c#, or if it's a server side
thing. Here are a couple of links:
http://www.serverspy.net/bin/hmon/12.183.157.40:27015/0/image.png
http://miniprofile.xfire.com/gaspar.png

Both of these images are real-time/dynamically generated, but they have a
..png extension. I understand how to create/manipulate and render images in a
..aspx page, but the image tag has to point to an .aspx page address to work.
How are these images being generated with a .png extension?

My first guess would be that the mapping for the .png extension is being
changed ont the server to use whatever scripting language the site is
supported. Since the images are generated real-time I'd rule out saving temp
files for display purposes.

Any ideas/help will be appreciated.

Thanks.
.

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