Sure enough, it's looking for image/png and I'm using image/x-png:
$ strings winEmbed.exe | grep image | grep png image/png,*/*;q=0.5 image/png image/png image/png
Let's change it and test! Woohoo, we may have a winner!
last updated 2013-01-10 20:36:24. served from tektonic.jcomeau.com