How to Open a Winmail.dat Attachment on Mac

How to Open a Winmail.dat Attachment on Mac

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These are instructions on how to open winmail.dat attachment files on a Mac. You may need to do this if you've received a trusted email attachment from a Windows user that can't be opened on your Mac.

Tip: If you know the correct extension of the file you've received, you can skip these steps and just rename the file.

Step One
Install the completely free TNEF's Enough utility from the Mac App Store.

How to Open a Winmail.dat Attachment on Mac

Step Two
Save the winmail.dat attachment to a folder on your computer. In Mail you can do this by right clicking (control+clicking) on the attachment and choosing Save Attachment... from the contextual menu that appears.

How to Open a Winmail.dat Attachment on Mac

Select your destination folder then click Save.

How to Open a Winmail.dat Attachment on Mac

Step Three
Launch TNEF's Enough, then select Open from the File menu.

How to Open a Winmail.dat Attachment on Mac

Select the winmail.dat file you just saved and click Open.

How to Open a Winmail.dat Attachment on Mac

Step Four
A window will open revealing the correct name of the attachment.

How to Open a Winmail.dat Attachment on Mac

Double click on the attachment, select a destination folder to save it in, then click Save.

How to Open a Winmail.dat Attachment on Mac

Step Five
That's it, you can now open the attachment from the folder you saved it in!

How to Open a Winmail.dat Attachment on Mac

macuser84 - October 25, 2020 at 5:45pm
There’s another much easier solution Simply change the extension .dat with .pdf
1
iClarified - October 25, 2020 at 8:31pm
As mentioned in the beginning of the tutorial, this only works if you know that the attachment is a PDF.
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