[google-appengine] Strange behavior with static .png file

[john]

I have some .png files in a directory that is configured as a static file 
handler. When I point my browser to the URL for any of the images, the 
result is not what I expect:

   - On Windows/Chrome, the image file is not displayed, but instead it is 
   automatically downloaded.
   - On OSX/Chrome and OSX/Safari, a browser message indicates that a 
   Quicktime plugin is needed. When I click the "Run this time" button, the 
   Quicktime logo is displayed with a big question mark in it.

I have other GAE apps with static .png files that display in the browser as 
I expect. Can anyone help me figure out why this app doesn't? One URL which 
shows this behavior is 
http://calendar-ot.appspot.com/static/images/CalendarTools.png . For 
reference, I have pasted my app.yaml file to http://pastebin.com/dRZJZRd7 . 

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