09 Jan 2005
04 Mar 2010
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My experience with this "fix" is that the script reads the page dom specifically looking for the .png extension of the images to "fix".
However, by default, the extensions of library item urls will be either .sflb.ashx or .sflb (depending on the version).
I suspect you may need to override the default library httphandler for png files, to use the original extension (I seem to recall there are some KB articles and forum threads on how to do this) as hacking the script in the .htc file is probably not going to work.