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[tinc]

While Coppermine supports already a good number of files, allowing kmz-files could increase its potential even more.
There's a workaround offering them as a zip file but it's more member focused not to.

[Joachim Müller]

just add those files to the filetypes table, see http://forum.coppermine-gallery.net/index.php?topic=18012.0
However, this should have been asked on the support board that corresponds to your coppermine version, not in feature requests.