I have a litle doubt about FireWorks png and the w3 png.
How can two different kinds of files have the same name?
PNG explicitly allows for application-specific custom data to be included in a file. If another application that doesn't understand those custom chunks loads the file, it will ignore them.
See: http://www.w3.org/TR/PNG/#14EditorsExt
Plus, can Gimp handle with FW png?
AFAIK Gimp has no explicit support for Fireworks' custom data chunks, but it should load the regular image data just fine.
-- brion vibber (brion @ pobox.com)
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