Rt2->rt3 problem with encodings

Hello.
Synopsis:
After convertation of DB with tools 1.16 some attachments was not
converted to UTF-8.
Full report:
Ticket metadata from file generated with script:
no warnings qw/redefine/;
sub Data {
$VAR1 = {
‘Subject’ => ‘xxxx in koi8-r encoding’,
‘Status’ => ‘new’,
‘Transaction’ => [
{
‘Type’ => ‘Create’,
‘Ticket’ => ‘860’,
‘Attachment’ => [
{
‘Subject’ =>
‘absolutely same subj’,
‘ContentType’ =>
‘text/plain’,
‘Headers’ =>
‘Content-Type: text/plain
Content-Disposition: inline
Content-Transfer-Encoding: binary
MIME-Version: 1.0
X-Mailer: MIME-tools 5.411 (Entity 5.404)
’,
‘Creator’ => ‘191’,
‘Parent’ => ‘0’,
‘Created’ =>
‘2003-01-30 08:58:00’,
‘id’ => ‘2762’,
‘Content’ => ‘Content
in koi8-r’,
‘ContentEncoding’ =>
‘none’,
‘TransactionId’ => ‘4564’
}
],
‘Created’ => ‘2003-01-30 08:58:00’,
‘id’ => ‘4564’,
‘Creator’ => ‘191’
}
],
{…snip…}

After importing in rt3 db information about ticket was converted, but
attachment content and subject still in koi8-r.
Also when we use web interface all general info in UTF-8, but
attachments in the original encodings(koi8-r or cp1251) and not
visible(in mozilla, IE not tested). I don’t uderstand why script don’t
convert text/plain attachs.

RT3 conf part about Unicode:
@EmailInputEncodings = qw(utf-8 iso-8859-1 us-ascii cp1251 koi8-r);

other defaults.

RT3 DB select:
select ContentType,ContentEncoding from Attachments where id = 2762;
| ContentType | ContentEncoding |
| text/plain | none |
RT3 DB select:
select ContentType,ContentEncoding from Attachments where id=2762;
| ContentType | ContentEncoding |
| text/plain | none |

    Any sugestions about fixing this? I could try additional tests 

and coding.
Best regards.
Ruslan.