Attachment - File name with accents

Question

Hello,
I finally realized why Mail was sending weird name attachements (.doc00, .doc\ca, etc.). It happens when a file name contains an accent (é, à, è...). Now, I'm French, so accents are very useful...
I mean, why is this happening now? Is Mac OS becoming like Windows NT or 98?
Any fixes in sight? Any solutions?
Thanks,
Daniel
P.-S. : Tried 10.5.3, not better, plus the upgrade crashed my IBook G4 two times! Way to go, Apple!

Answer 1

When I use Thunderbird/gmail to send my email, and the attachment with non-ASCII file name can be read correctly using the following codes:
String attFileName = MimeUtility.decodeText(part.getFileName());
but when I send the email use outlook2003, it just return bad file name.
The following is the attachment related content:
Thunderbird:
--------------090808030807020200030902
Content-Type: text/plain;
name="=?GB2312?B?ztK1xLzGy+MudHh0?="
Content-Transfer-Encoding: base64
Content-Disposition: attachment;
filename*=GB2312''%CE%D2%B5%C4%BC%C6%CB%E3%2E%74%78%74
OUTLOOK:
------_=_NextPart_001_01CACBCD.3577323E
Content-Type: text/plain;
name="=?gb2312?B?ztK1xLzGy+MudHh0?="
Content-Transfer-Encoding: base64
Content-Description: =?gb2312?B?ztK1xLzGy+MudHh0?=
Content-Disposition: attachment;
filename="=?gb2312?B?ztK1xLzGy+MudHh0?="
GMAIL:
--000e0cd11976ac6e63048297dd06
Content-Type: text/plain; name="=?GB2312?B?ztK1xLzGy+MudHh0?="
Content-Disposition: attachment; filename="=?GB2312?B?ztK1xLzGy+MudHh0?="
Content-Transfer-Encoding: base64
X-Attachment-Id: f_g770st560
What is the difference?