attachment filename in japanese garbled

my SM language is setting to ja_JP.when downloading the attachment with a Japanese file name,the file name is garbled.

so, we change the SJIS to UTF-8.it will be processed correctly.
squirrelmail-1.4.19/functions/i18n.php
 643                 $ret = mb_convert_encoding($ret, 'UTF-8', 'AUTO');

best wishes.
by CHEN

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