Language support?

Thanks for the great plugin…
But i have a problem with fields filled with Greek characters (such as first name, last name etc….I live in Greece…)
I get ????? in these fields..
Any suggetion?
Thanks

http://wordpress.org/extend/plugins/wp-users-exporter/