Having problems opening a dat file?

Find out what programs can help open, view, play or convert your dat files.

Opening dat files
Exchange E-mail Attachment

Did your computer fail to open a dat file? We explain what dat files are and recommend software that we know can open or convert your dat files.

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What is dat file?

Winmail.dat files contain formatting information for Rich Text (RTF) messages sent from Microsoft Exchange Server; they are added to the end of e-mails when a recipient's e-mail client does not support RTF messages; the Winmail.dat file is not useful to users that do not use Outlook or Exchange Server to retrieve their mail. Read more about Winmail.dat files, including how to prevent them from being sent.

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