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Winmail.dat attachments

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-Outlook uses the Transport Neutral Encapsulation Format (TNEF) to send messages with Rich Text Format (RTF) formatting. If your email 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 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.
-:[http://www.fentun.com/ Fentun] Win9X, NT, and Win2K but not Windows XP+* [http://www.fentun.com/ Fentun] Win9X, NT, and Win2K but not Windows XP
-:[http://www.download.com/AkeeSoft-WMViewer/3000-2369_4-10383013.html?tag=lst-0-1 AkeeSoft WMViewer] Windows 95X though Windows Server 2003+* [http://www.download.com/AkeeSoft-WMViewer/3000-2369_4-10383013.html?tag=lst-0-1 AkeeSoft WMViewer] Windows 95X though Windows Server 2003
-:[http://www.download.com/Winmail-Opener/3000-2369_4-10477142.html Winmail Opener] Windows 95X though Windows Server 2003+* [http://www.download.com/Winmail-Opener/3000-2369_4-10477142.html Winmail Opener] Windows 95X though Windows Server 2003
-:[http://sourceforge.net/projects/tnef/ TNEF] Linux+* [http://sourceforge.net/projects/tnef/ TNEF] Linux
-:[http://www.joshjacob.com/macdev/tnef/ TNEF's Enough] OS9 and OSX+* [http://www.joshjacob.com/macdev/tnef/ TNEF's Enough] OS9 and OSX
-The sender can avoid sending a winmail.dat file by turning off TNEF. +The sender can avoid sending a winmail.dat file by turning off TNEF in Outlook.
-#On the Tools menu, click Options, and then click the Mail Format tab.+#On the "Tools" menu, click "Options", and then click the "Mail Format" tab.
-#In the Send in this message format list, click Plain Text or HTML, and then click OK.+#In the "Send in this message format" list, click "Plain Text" or "HTML", and then click "OK".
-==External Links==+==External links==
*[http://support.microsoft.com/default.aspx?scid=KB;en-us;q241538 Microsoft article on TNEF] *[http://support.microsoft.com/default.aspx?scid=KB;en-us;q241538 Microsoft article on TNEF]
*[http://support.microsoft.com/kb/q138053/ Microsoft article on how to prevent winmail.dat attachments from being sent to Internet users] *[http://support.microsoft.com/kb/q138053/ Microsoft article on how to prevent winmail.dat attachments from being sent to Internet users]
 +
[[Category:Issues (Thunderbird)]] [[Category:Issues (Thunderbird)]]
 +[[Category:Attachments (Thunderbird)]]

Revision as of 05:03, 19 January 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 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.


  • 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