tnef - 1.4.18-4+b1 main

TNEF is a program for unpacking MIME attachments of type
"application/ms-tnef". This is typically a Microsoft only attachment.
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The TNEF program allows one to unpack the attachments which were
encapsulated into the TNEF attachment, thus alleviating the need to use
Microsoft Outlook to view the attachment.