Unreadable attachments

[tgx]

I have a user that is receiving attachments from a large global shipping company that are unreadable. My attempts at resolving the issue with them are really going nowhere. I know the problem is happening because their payment processing system is undergoing some sort of conversion process in which an email is created and a text attachment is made.

Here is what is produced by Zimbra if you click on the Attachment or try to use any of the attachment options like Download/Briefcase etc...

HTTP ERROR 500

Problem accessing /service/home/~/Remit.txt. Reason:

Unknown encoding: 8bits

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I am able to use other client software to access the mailbox and open the attachment, but the web interface flips out.