Did you receive an email that included an attachment with “winmail.dat” in the name. This may happen if the email message was sent to you by someone using a incorrectly configured Microsoft email app like Outlook.
Incorrectly configured Microsofts Outlook e-mail app may send e-mails in the “Transport Neutral Encapsulation Format” (TNEF), named “winmail.dat”. This occurred because the sender used the Rich Text message format (like bold, italics etc) encapsulated in the Transport Neutral Encapsulation Format (TNEF), which your OS X Mail app could not recognize.
A TNEF-encoded email message will contain a plain text version of the mail you received. Thus you may simply ignore this attachment.
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- Did you receive an email that included an attachment with “winmail.dat” in the name. This may happen if the email message was sent to you by someone using a incorrectly configured Microsoft email app like Outlook.
You will see this as:
The 1.2.15 version of DAT Reader is available as a free download on our software library. The current installer available for download occupies 687 KB on disk. To open Winmail.dat files on a Mac, a Winmail reader is needed. Though not that large in quantity, there are still some top Winmail viewer for mac available for choice. Here I recommend you Cisdem Document Reader.
Content-Type: application/ms-tnef;
name=”winmail.dat”
name=”winmail.dat”
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What if I want to open the Winmail.dat file?
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Winmail.dat file is a Microsoft proprietary Outlook/Exchange format. The most convenient way to view this file is to use a converter program. There are many available. For instance, this is a free online converter that you may use to open the “winmail.dat” file.
Another option is to use the TNEF’s Enough for Mac OS app, which is also available on the Mac Store.
When people send messages from incorrectly configured Microsoft Outlook email clients, a file attachment called winmail.dat may be added as an attachment to the message. This file contains formatting information for messages that use Microsoft's proprietary TNEF standard and any attachments sent with the original message. The file is not recognized by other email clients. Because of this, any attachments sent with the original message are not displayed in Thunderbird's message pane.
If you try to open winmail.dat, you will probably be prompted to specify the application that should be used to open the file. Because this file is in a Microsoft proprietary Outlook/Exchange format, you may not have an application installed that can decode this file and display it. Even if your system is capable of displaying the file, it does not contain any useful information.
To prevent this file from being attached to messages, the sender of the message (or their system administrator) can configure various options as described in this Microsoft Support article.
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There is also a Thunderbird add-on called LookOut which tries to decode the TNEF attachment (winmail.dat) and display the original attachments in Thunderbird's message pane. This add-on is not provided or supported by Mozilla and its compatibility with future versions of Thunderbird is not assured. The best solution is to contact the message sender and inform them that their copy of Outlook is incorrectly configured as suggested in the Microsoft Support article.