This file contains formatting code that was sent by someone using Microsoft Outlook or Microsoft Exchange. It usually will not contain any useful information other then RTF formatting code that permits two MS Exchange users to send e-mail messages with formatting such as bold and italics.
When a user sends an e-mail with this formatting option to someone who is not using MS Outlook, a winmail.dat file appears as an attachment (even though no attachment was sent).
Additionally, when a separate attachment, such as a Word 97 document is also sent from the user on MS Outlook to a non-MS Outlook user, the attachment and winmail.dat file may be combined into a single winmail.dat file.
Solution:
Have the sender turn off the option to send Rich Text Formatted e-mail messages to you.
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