Chinese(Traditional) filename encode error

[pigochu]

When I attach chinese file by RoundCube WebMail? , the file name will be ATT00413.txt in Outlook Express.

But my orig file name is : 測試.txt

Mail Header :

Content-Transfer-Encoding: base64
Content-Type: text/plain; charset="UTF-8";

name*="UTF-8%E6%B8%AC%E8%A9%A6.txt";

Content-Disposition: attachment;

filename*="UTF-8%E6%B8%AC%E8%A9%A6.

[alec]

This is properly encoded filename according to RFC2231 which OE does not understands. You can change this in Roundcube using "Attachment names" option.