Update (05-May-2016): 330,000+ winmail.dat files successfully extracted to date! 33% discount is continued! Thank you all for making Winmail.dat File Viewer Pro the best app for opening winmail.dat files on iOS.

Winmail.dat File Viewer Pro - Open winmail.dat TNEF-encoded Outlook files on iPhone and iPad is the #1 way to view winmail.dat attachment data on your iOS devices.

Due to a badly configured Outlook mail server, emails may contain winmail.dat attachments instead of the actual email content in readable format. This app enables you to view data contained in such winmail.dat files.

Please note that this app only opens "winmail.dat" files with TNEF encoding and cannot be used to open any other files with ".dat" extension.

The extracted attachment data can be emailed, saved to Dropbox, Drive, Mail, Facebook, Twitter etc. using the respective apps on your device.

If you are unable to open a winmail.dat attachment for some reason, please contact me using the support link or on twitter: @FollowChintan and i will act on it within 12 hours.

What’s New

Version 2.5

This app has been updated by Apple to use the latest Apple signing certificate.

Most requested feature is here: Added support for ".ics" iCal calendar and ".vcf" vCard contact files!

Contents of winmail.dat files are now stored within the app itself so you don't have to "Open In Winmail" every time from Mail. Just go directly to Winmail app and all previously parsed files are there for you!

Updated app for iOS 9.

Added iPad Pro resolution icon.

If this app has been useful to you, please give a positive rating on App Store. It really helps with app ranking.

I am always available at to answer your questions.

Ratings and Reviews

1.4 out of 5
10 Ratings

10 Ratings

Amy_uugggh ,

No good

It only enables you to view the file in the app. I get meet invites and all I could do is see the invites, I could not save it to my calendar.... uuughh
Hate it when solutions are half baked :(

pbrockma ,

Winmail APP

I would give this APP 5-Stars!

The quickest response I have ever had from a Help area.

It restores my faith in the word "Support".

Forgetitnow ,

Worthless to me.

I purchased the basic to open a windat attachment. All that I see was accomplished was that I gave a 2.98 donation to research and development!

App Privacy

The developer, Chintan Patel, has not provided details about its privacy practices and handling of data to Apple.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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