If you are here, it means that you’ve received an empty email with the attachment winmail.dat. You are wondering: what is it and how to open it? A winmail.dat file or (TNEF) is a special attachment type sent by Microsoft email applications. Many email client applications like Thunderbird cannot open them. The Winmail.dat Reader is […]
How to open a winmail.dat file
Winmail.dat files (also known as TNEF attachments) are special types of email attachment files sent by Microsoft servers. This article explains shortly how to open a winmail.dat file sent by email to you.
What is a winmail.dat file?
What is Winmail? Winmail.dat files are attachments sent by Microsoft mail applications (Outlook, Outlook Express or Exchange) in a proprietary format called TNEF (transport neutral encapsulation format). Being a non-standard attachment format, users from other e-mail clients (like Gmail or Thunderbird) or platforms (like Android, Apple, iPad or iPhone) cannot natively read them.An e-mail containing a winmail.dat attachment […]