File Chooser Dialog returns underscores for extended character set characters

Hi all,

I have been digging around the Mozilla website trying to find some 
information on this problem with no luck, so I thought I would post here.

When I use a File Chooser Dialog on a file with extended character set 
characters in the path and/or name, those characters end up in my Input 
field as underscores.  I have the meta tags on the page set up as 
follows.....

<meta http-equiv="Content-Type" content="text/html; charset=gb2312"/>

I get Chinese characters to display on the page, and on that other browser 
(i.e.. IE ;) ) I can browse, get the file name and upload the file fine.  I 
can also successfully submit internationalized string data via post using 
FireFox.  I guess my point is that I think I have things set up correctly, 
and I am wondering if I am missing something or if this is a FireFox 1.5 
problem.

Thanks in advance for your help,

Jeff