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winmail.dat files

by 41hijinx / March 5, 2010 6:59 AM PST

I have a 13" macbook pro, 4 gig ram, os 10.6.2. How can I open a winmail.dat file? Thanks!

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Ahh, the infamous winmail.dat files,
by mrmacfixit Forum moderator / March 5, 2010 8:27 AM PST
In reply to: winmail.dat files

Don't you just love Microsoft! (Rhetorical, no answer required)

The problem is caused by Outlook decided which format it is best to send emails in.

Outlook can be configured to prevent this happening, so if it keeps happening to you with emails from the same person, direct them to this site:

Meanwhile, just pop over to this site:
and download this little utility.
Follow the instructions and you will be able to open and read the email.

Let us know how you get on.


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won't open
by 41hijinx / March 5, 2010 8:17 PM PST

I downloaded the file for 10.5 and above, but when I try to open the winmail.dat file nothing happens. Is it compatible with 10.6.2 I wonder? Thanks for your suggestions.

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At the risk of teaching you how to suck eggs,
by mrmacfixit Forum moderator / March 5, 2010 11:28 PM PST
In reply to: won't open

try this:
On the email with the offending winmail.dat file, save that attachment to the desktop.

Launch the TNEF application, it works on 10.6.2, and choose Open from the menubar at the top of the screen.
Navigate to the desktop and choose the winmail.dat file that you saved there.

Any better?

Of course, you may have already done all of the above. In that case, sorry.


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this is the result of my research on these files:
by Mr. Gregg / March 6, 2010 12:04 AM PST
In reply to: won't open

winmail.dat is a windows-only file that often gets sent over exchange server accounts. It doesn't contain any useful info for a Macintosh mail client because you can't follow the data back to the source from your computer. winmail.dat files can only be received by other Microsoft Exchange users. No one else can view them without additional software or having the Exchange user reconfigured.

Sorry, I don't have the source. Might've been Wikipedia.

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(NT) They have the additional software
by mrmacfixit Forum moderator / March 6, 2010 6:15 AM PST
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by 41hijinx / March 6, 2010 10:19 PM PST

Thank you again. Well I followed your instructions but when I click on the winmail.dat file I get a box in the upper left of the screen entitled "winmail.dat:." Below that "embedded files" and beside that "attributes". Below in the box: b

What is going on?

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Don't know,
by mrmacfixit Forum moderator / March 6, 2010 11:17 PM PST
In reply to: stymied

and without that .dat file it is almost impossible to find out.

If you really want to know, you could email it to me, email me via my profile and let me know.


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your profile
by 41hijinx / March 7, 2010 12:36 AM PST
In reply to: Don't know,

Thanks for your offer, but when I went to your profile and clicked on email mrmacfixit I did not see a button for an attachment. Please advise.

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An alternative app
by Kevin M. Dean / March 7, 2010 7:08 AM PST
In reply to: your profile
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Nowhere for an attachment
by mrmacfixit Forum moderator / March 7, 2010 9:02 PM PST
In reply to: your profile

I'll give you an address after you email me


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