We recheck your site again today and upload files with Greek name and description
http://www.mikroentypo.gr/gama/video/gallery/--2008-04-26
http://www.mikroentypo.gr/gama/music/gallery/--2008-04-26
in first link used combination Greek and China symbols, so all ok,
And recheck settings of your operation system :) and install normal Greek unicode language