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Instead of seeing the e-mail and/or attachment, If your e-mail program receives a TNEF file and doesn't understand it, In fact, even Microsoft's own Outlook Express can't read this format! Lotus Notes, Thunderbird / Netscape Mail, and Eudora. Most other email readers cannot read this nonstandard format.Įmail clients that can't (currently) read this format include The full name of the format is "Transport Neutral Encapsulation Format",īut that is a misleading name, because it obstructs reception due (such as MIME and HTML) directly for attachments, but Outlook fails to do so What Outlook is supposed to do is simply use the industry standards When it sends email - typically when it sends attachments. Use a nonstandard extra packaging mechanism called "ms-tnef" or "tnef" The basic problem is that in certain cases Microsoft's Outlook or The Problem: Microsoft Outlook sometimes sends a non-standard format (TNEF) Here's a brief explanation of the problem, and what to do about it. They only received a file named (typically) "Winmail.dat", "Win.dat", or "can't open the attachment" of an email, because

Wheeler (first released )Īll too often nowadays people report that they Microsoft Outlook/Exchange MS-TNEF handling (aka "Winmail.dat", "Win.dat", or "Part 1.2" problem of unopenable email attachments) Microsoft Outlook/Exchange MS-TNEF handling (aka "Winmail.dat", "Win.dat", or "Part 1.2" problem of unopenable email attachments) David A.