4 Best Winmail.dat Opener for Mac (Free Solution Included)

2017-09-14 21:07:52 / Posted by Jose Henline to Utility Follow @ Jose

Q 1: “I sometimes receive email messages with a ‘winmail.dat’ file attached that I cannot open. I am a newbie to Mac, can somebody recommend me some document reader to open or view winmail.dat for Mac?”

Q 2: “What is a winmail. dat file and should I look for a winmail viewer to open and view it?”

Have you ever encounter the above same trouble? If people send messages from incorrectly configured Microsoft Outlook email clients, a file attachment named winmail.dat might be added as an attachment to the message. And you can’t open the files on Mac normally without a winmail opener for Mac. How to open and view winmai files and attachments on Mac? This article will share four best winmail openers for Mac users.

Some developers have created helpful programs that can open winmail files. Please refer to the following information, to choose your best Winmail.dat Opener on mac.

No.1 Cisdem DocumentReader ($14.99)

Cisdem Document Reader is an one-stop solution for you to open winmail.dat files on Mac and allows any attachments contained in them to be previewed and saved. Besides viewing winmail.dat files, it can also open WPD, WPS, Visio, OXPS/XPS, DjVu and PDF files on Mac. 


  • It supports OS X 10.8 Mountain Lion or later.
  • It opens winmail.dat files and list all contents of a winmail.dat file.
  • It opens numerous winmail.dat files at a time.
  • You can open .dat files in other applications.
  • It has high quality and easy to use.
  • It offers free trail.
  • Different formats of documents can be read simultaneously.


  • It’s not free and will cost you just $14.99.

Free Download

No.2 TNEF's Enough (free)

Standard e-mail programs will receive the TNEF file as an attachment named "winmail.dat". TNEF's Enough allows Macs to read and extract files from Microsoft TNEF stream files. This free winmail opener can open the "winmail.dat" file and allow you to extract the attachments on Mac.


  • It supports Mac OS X 10.10/10.11/10.7/ 10.8/10.9/ 10.11/10.7.
  • It allows you to open .dat files.
  • It is free and easy to install.


  • You have to save the attachment first and cannot just double click to open it directly from this app.
  • Some users tried to open three different 'Winmail.dat' files. Each of them gives a similar result--couldn’t be opened.

No.3 Letter Opener Pro ($29.95)

Letter Opener Pro as a Plugin for Apple Mail helps you with your winmail related problems and makes your life simpler. It seamlessly and automatically converts winmail.dat files right inside your OS X Mail application.


  • It supports Mac OS X 10.4/10.5/10.6/10.7/10.8/10.9/ 10.10/10.11.
  • It converts winmail.dat file inside OS X Mail.
  • It is completely transparent.
  • It offers free trail.


  • With new versions of OS X a paid upgrade is often required.
  • Too expensive for what it does.

No.4 MSG Viewer for Outlook ($14.99)

MSG Viewer for Outlook (was Outlook MSG Viewer) lets you open those frustrating Microsoft Outlook MSG, OFT, and Winmail.dat files on your Mac. Batch processing and conversion of Outlook MSG contacts (.vcf) is also supported.


  • It supports Mac OS X 10.10/10.11/10.5/10.5 Intel/ 10.5 PPC/ 10.6 /10.7/10.8/10.9.
  • It converts original attachments to messages it opens.
  • It supports batch processing of files.
  • It offers free trail.


  • Its interface is uninviting.
  • The trial version of the program includes a 20-second delay before opening each message, and you have to pay for it to remove this limitation.
  • It dose not show attachments in emails with digital signatures or encryption in the formats that created them.


Since four best dat file readers for Mac have been introduced to you, you can choose one of them to open winmail files on your Mac now. But after comparing their features, functions, disadvantages and prices, it’s no doubt that Cisdem Document Reader for Mac would be the best winmail opener for you.

Just have a try on the free trial version and open your Winmail.dat files quickly and easily.

Free Download

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1 Comments Leave a Reply

  • Amy

    Thanks, I really like your posts. Each time you post a new article, I will take a look at it.

    3 years ago REPLY