Winmail.dat attachments: Difference between revisions

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Outlook uses the Transport Neutral Encapsulation Format (TNEF) to send messages with Rich Text Format (RTF) formatting. If your e-mail client doesn't support TNEF (most don't) you also recieve a winmail.dat attachment. Sometimes you may receive an attachment with a generic name such as ATT00008.dat or ATT00005.eml instead. You can configure Thunderbird to use one of the programs below to open the attachment.
Outlook uses the Transport Neutral Encapsulation Format (TNEF) to send messages with Rich Text Format (RTF) formatting. If your e-mail client doesn't support TNEF (most don't) you may also recieve a winmail.dat or a "Part 1.2" attachment. Sometimes you may receive an attachment with a generic name such as ATT00008.dat or ATT00005.eml instead. You can configure Thunderbird to use one of the programs below to open the application/ms-tnef attachment.





Revision as of 02:25, 1 March 2006

This article was written for Thunderbird but also applies to Mozilla Suite / SeaMonkey (though some menu sequences may differ).

Outlook uses the Transport Neutral Encapsulation Format (TNEF) to send messages with Rich Text Format (RTF) formatting. If your e-mail client doesn't support TNEF (most don't) you may also recieve a winmail.dat or a "Part 1.2" attachment. Sometimes you may receive an attachment with a generic name such as ATT00008.dat or ATT00005.eml instead. You can configure Thunderbird to use one of the programs below to open the application/ms-tnef attachment.


  • Fentun Win9X, NT, and Win2K but not Windows XP


The sender can avoid sending a winmail.dat file by turning off TNEF in Outlook.

  1. On the "Tools" menu, click "Options", and then click the "Mail Format" tab.
  2. In the "Send in this message format" list, click "Plain Text" or "HTML", and then click "OK".

External links