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May 10, 2026 |
File extension winmail.dat
Name: Email-related Files
Popularity: 8
Open With: Winmail Reader
What is this winmail.dat file?
Winmail.dat or ATT0001.dat attachments are TNEF encoded files sent by Microsoft Outlook and Exchange. Users with other e-mail clients (like Thunderbird or Lotus Notes) or platforms (like Android, Apple, iPad or iPhone) cannot natively read the winmail.dat files. For more information on TNEF files, see our Winmail.dat files section.
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