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What's a winmail.dat file and how do I open it?
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Professional Poster
Join Date: Sep 2000
Location: San Francisco
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My wife received an email with a winmail.dat attachment. What is it and how does she open it? She knows the sender and was expecting an attachment so I don't think it is a virus.
kman
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Posting Junkie
Join Date: Feb 2005
Location: 888500128
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Googled dat file extension.
first link:
Extension: DAT
Program and/or Extension Function Company
Exchange Server Error Message (WINMAIL.DAT) Microsoft
Specific Notes
When an end user sends mail to the Internet from an Exchange Windows or Outlook client, a file attachment called WINMAIL.DAT may be automatically added to the end of the message if the recipient's client cannot receive messages in Rich Text Format (RTF). The WINMAIL.DAT file contains Exchange Server RTF information for the message, and may appear to the recipient as a binary file. A program called WMDecode can be used to recover any attachments from the WINMAIL.DAT file.
She'll need a PC to open it.
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Professional Poster
Join Date: Sep 2000
Location: San Francisco
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"...if the recipient's client cannot receive messages in Rich Text Format (RTF)"
My wife is using Mail which should be able to handle RTF. Seems a little odd...
kman
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Forum Regular
Join Date: Jun 2002
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Originally Posted by analogika
She'll need a PC to open it.
No. Look on versiontracker for a program called "TNEF's Enough".
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Posting Junkie
Join Date: Feb 2005
Location: 888500128
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Originally Posted by kman42
"...if the recipient's client cannot receive messages in Rich Text Format (RTF)"
My wife is using Mail which should be able to handle RTF. Seems a little odd...
kman
Yeah, but some idiot mailserver along the way might not?
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Posting Junkie
Join Date: Feb 2005
Location: 888500128
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Originally Posted by Morpheus
No. Look on versiontracker for a program called "TNEF's Enough".
Ah, cool.

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Professional Poster
Join Date: Sep 2000
Location: San Francisco
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Originally Posted by analogika
Yeah, but some idiot mailserver along the way might not?
Got it. I tried that program and it couldn't open it either. Ah well, my wife resorted to using the telephone
kman
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Forum Regular
Join Date: Nov 2000
Location: La Crosse , WI USA
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Its a M$ thing - the person that sent the message was using Outlook and encoded it in RTF. Of course, RTF in M$ world is not normal Rich Text Format. Insteads its M$ own version. She'll need Outlook (PC) to read the message or contact the person that sent it and tell not to encode the message with M$RTF.
Last time I saw this, some smuck 'Exchange Server Admin' checked the box on the Exchange server to encode all outgoing/incoming message as M$RTF because he thought it was a good idea. Not a problem if everyone your sending to is using Outlook - but that's not usually the case. Anyway, we removed the option and all was well again. . .
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