Winmail.dat Reader

» What is Winmail

Winmail.dat files are attachments sent by Microsoft mail applications (Outlook, Outlook Express or Exchange) on a propriertary format called TNEF (transport neutral encapsulation format). Being a non-standard attachment format, users from other e-mail clients (like Thunderbird or Lotus Notes) or platforms (like Android, Apple, iPad or iPhone) cannot natively read them.
An e-mail containing an winmail.dat attachment looks like an empty e-mail with only one attachment. The original e-mail information like subject, body and attachments is packed into a single winmail.dat file, which in some cases also receives a generic name like ATT00001.dat or ATT00005.eml.

» How to open Winmail.dat files

Winmail.dat Reader is the only free application that decodes not only the embedded attachments but also the subject and body. It comes in three version:

• Winmail.dat Reader application for MS Windows
• Winmail.dat Reader application for Android
• Winmail.dat Reader Online free decoder for all other platforms

» Additional information

To learn more about winmail.dat files, check also these links:

• Microsoft Exchange - How to Prevent the Winmail.dat File from Being Sent
• Microsoft Outlook - How to Prevent the Winmail.dat File from Being Sent
• MozillaZine Knowledge Base - Winmail.dat attachments
• Wikipedia - Transport Neutral Encapsulation Format
   

» Other native decoders

If you are looking for a Mac, iPhone, iPad or Linux solutions, check these ones:

• TNEF  -  Linux
• TNEF's Enough  -  Mac OSX
• Letter Opener  -  iPhone and iPad

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