Winmail Reader

What is Winmail Reader?

Winmail Reader is a basic application for opening winmail.dat files, which are email attachments, sent by Microsoft Outlook, Outlook Express and Microsoft Exchange. The attachments are sent using a less common container format known as TNEF, or Transport Neutral Encapsulation Format.

This format, since it is not commonly known and used, is not easily accessed by users, because file readers do not generally support this type of format. With Winmail Reader, users are now able to access these email attachments, and convert them as well into more popular formats.

Normally, these files look like the following: winmail.dat, ATT0001.dat or ATT00005.eml. Users who receive this type of email will generally see an email without a message, and that which contains just the attachment. This means that all email contents are stored within the winmail.dat file, and to see the full text of the email, an application that is able to decode the file is needed.

There are three versions of the application: one for Windows, one for Android devices and the last one for online use. Winmail Reader Online is cross-platform. All versions are provided as freeware.

Download Winmail Reader from the developer

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Download Winmail Reader (external link)

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File types supported by Winmail Reader

Our users primarily use Winmail Reader to open these file types:

About file types supported by Winmail Reader

File.org aims to be the go-to resource for file type- and related software information. We spend countless hours researching various file formats and software that can open, convert, create or otherwise work with those files.

If you have additional information about which types of files Winmail Reader can process, please do get in touch - we would love hearing from you.