Apple Mail long russian filename attachment problem

Question

Hi,
The problem is that Mail.app set incorrect filename for attachment. I have gmail account and set up Mail.app as IMAP client. Most attachments are correct, but sometimes they come with bad names.For example:
In  gmail account (web) everything is ok:
The problem is that Mail.app set another filename, set up KOI-8 and instead of having one name=".....", we have name*0, name*1, name*2
In gmail:
Content-Type: application/vnd.openxmlformats-officedocument.wordprocessingml.document;
          name="=?UTF-8?B?0KTRg9C90LrRhtC40L7QvdCw0LvRjNC90YvQtSDRgtGA0LXQsdC+0LLQsN C90LjRjyDQuiDQpNCe?=
          =?UTF-8?B?0J8gLSDQstGL0LHQvtGAINC/0YDQvtC00YPQutGC0LAg0Lgg0L/QvtC70Y8g0LrQ vtGC0L7RgNGL0LUg?=
          =?UTF-8?B?0L7RgdGC0LDRjtGC0YHRj192NC0xLmRvY3g=?="
Content-Disposition: attachment;
          filename="=?UTF-8?B?0KTRg9C90LrRhtC40L7QvdCw0LvRjNC90YvQtSDRgtGA0LXQsdC+0L LQsNC90LjRjyDQuiDQpNCe?=
          =?UTF-8?B?0J8gLSDQstGL0LHQvtGAINC/0YDQvtC00YPQutGC0LAg0Lgg0L/QvtC70Y8g0LrQ vtGC0L7RgNGL0LUg?=
          =?UTF-8?B?0L7RgdGC0LDRjtGC0YHRj192NC0xLmRvY3g=?="
Content-Transfer-Encoding: base64
X-Attachment-Id: f_hg876ra80
In Mail.App
Content-Disposition: ATTACHMENT;
          filename*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/ SI";
          filename*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
          filename*2="xLmRvY3g=?="
Content-Type: APPLICATION/VND.OPENXMLFORMATS-OFFICEDOCUMENT.WORDPROCESSINGML.DOCUMENT;
          name*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/SI";
          name*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
          name*2="xLmRvY3g=?="
Content-Transfer-Encoding: BASE64

Answer 1

BUG!!!
Here is. Mail.app converts filename into KOI8-R, but it doesn't change encoding for section (in this message - -047d7bb03fd6ab743004dbbf6ccd)
MIME-Version: 1.0
Received: by 10.49.61.129 with HTTP; Thu, 2 May 2013 10:18:35 -0700 (PDT)
Date: Thu, 2 May 2013 21:18:35 +0400
Delivered-To: [email protected]
Message-ID: <[email protected]m>
Subject: TEST
From: "Paul M. Tarasov" <[email protected]>
To: "Paul M. Tarasov" <[email protected]>
Content-Type: multipart/mixed; boundary=047d7bb03fd6ab743304dbbf6ccf
--047d7bb03fd6ab743304dbbf6ccf
Content-Type: multipart/ALTERNATIVE;
          boundary=047d7bb03fd6ab743004dbbf6ccd
--047d7bb03fd6ab743004dbbf6ccd
Content-Transfer-Encoding: BASE64
Content-Type: TEXT/PLAIN;
          charset=UTF-8
LS0gDQrQn9Cw0LLQtdC7DQo=
--047d7bb03fd6ab743004dbbf6ccd
Content-Transfer-Encoding: QUOTED-PRINTABLE
Content-Type: TEXT/HTML;
          charset=UTF-8
<div dir=3D"ltr"><br clear=3D"all"><div><br></div>-- <br><font face=3D"verd=
ana, sans-serif">=D0=9F=D0=B0=D0=B2=D0=B5=D0=BB</font>
</div>
--047d7bb03fd6ab743004dbbf6ccd--
--047d7bb03fd6ab743304dbbf6ccf
Content-Disposition: ATTACHMENT;
          filename*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/SI";
          filename*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
          filename*2="xLmRvY3g=?="
Content-Type: APPLICATION/VND.OPENXMLFORMATS-OFFICEDOCUMENT.WORDPROCESSINGML.DOCUMENT;
          name*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/SI";
          name*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
          name*2="xLmRvY3g=?="
Content-Transfer-Encoding: BASE64
It must be KOI8-R
MIME-Version: 1.0
Received: by 10.49.61.129 with HTTP; Thu, 2 May 2013 10:18:35 -0700 (PDT)
Date: Thu, 2 May 2013 21:18:35 +0400
Delivered-To: [email protected]
Message-ID: <[email protected]m>
Subject: TEST
From: "Paul M. Tarasov" <[email protected]>
To: "Paul M. Tarasov" <[email protected]>
Content-Type: multipart/mixed; boundary=047d7bb03fd6ab743304dbbf6ccf
--047d7bb03fd6ab743304dbbf6ccf
Content-Type: multipart/ALTERNATIVE;
  boundary=047d7bb03fd6ab743004dbbf6ccd
--047d7bb03fd6ab743004dbbf6ccd
Content-Transfer-Encoding: BASE64
Content-Type: TEXT/PLAIN;
  charset=KOI8-R
LS0gDQrQn9Cw0LLQtdC7DQo=
--047d7bb03fd6ab743004dbbf6ccd
Content-Transfer-Encoding: QUOTED-PRINTABLE
Content-Type: TEXT/HTML;
  charset=UTF-8
<div dir=3D"ltr"><br clear=3D"all"><div><br></div>-- <br><font face=3D"verd=
ana, sans-serif">=D0=9F=D0=B0=D0=B2=D0=B5=D0=BB</font>
</div>
--047d7bb03fd6ab743004dbbf6ccd--
--047d7bb03fd6ab743304dbbf6ccf
Content-Disposition: ATTACHMENT;
  filename*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/SI";
  filename*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
  filename*2="xLmRvY3g=?="
Content-Type: APPLICATION/VND.OPENXMLFORMATS-OFFICEDOCUMENT.WORDPROCESSINGML.DOCUMENT;
  name*0="=?KOI8-R?B?5tXOy8PJz87BzNjO2cUg1NLFws/Xwc7J0SDLIObv8CAtINfZws/SI";
  name*1="NA=?= =?KOI8-R?B?0s/E1cvUwSDJINDPzNEgy8/Uz9LZxSDP09TBwNTT0V92NC0";
  name*2="xLmRvY3g=?="
Content-Transfer-Encoding: BASE64