mod_admin_extra + set_vcard + windows accented characters (ejabberd_xmlrpc too)

Hi,

when I use set_vcard command on a windows XP machine with accented characters in the content, the vcard is not updated.
No error message is displayed.

I supposed it is a character encoding problem.

I have the same problem using ejabberd_xmlrpc with a Java client (on any OS). Java Strings are coded in UTF-16, and the xmlrpc client library doesn't convert accented characters into numeric character reference (é for é) as php xmlrpc functions do.
This time too : no error in ejabberd.log nor erlang.log. Everything seems to be good, but the vcard is not updated.

Is there way to fix that?

Thanks in advance