encoding problem

I'm sending a file to user:

upfile = UpFile.objects.get(file_hash=request.path[6:])
        user = get_object_or_404(User, username=request.user.username)
        down_file_log = DownFile.objects.create(user_id=user,
file_id=upfile)
        wrapper = FileWrapper(file(upfile.file_path))
        response = HttpResponse(wrapper)
        response['Content-Length'] = os.path.getsize(upfile.file_path)
        response['Content-Type'] = upfile.file_content_type + ';
charset=utf8'
        response['Content-Disposition'] = 'attachment; filename=\"' +
upfile.file_name + '\"'
        return response

Mysql database encoding is utf8_bin.
The problem is in the filename: everything works OK with English, but
if the file_name is in Russian then in IE6 it's horrible and unreadable
(when you press on file link and download window appears) :(( But in
Firefox && Opera it's OK :((
Any suggestions ?
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