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The Winmail.dat reader is a free tool available for Windows and online use that can open, convert, and save files from winmail.dat email attachments. It is the only reader that displays the original email&#039;s subject and body. <br> <br>Winmail.dat or ATT0001.dat attachments are TNEF-encoded files sent by Microsoft Outlook and Exchange. These attachments cannot be natively read by users on other email clients or platforms, such as Android, Apple, iPad, or iPhone.