Winmail File Viewer – No.1 app to open winmail.dat files on the App Store! Now updated for iOS 10 and the latest iPhones and iPads.

If this app does not open your winmail.dat file, or you have any questions, doubts, or suggestions, then please email me –

FAQs –

1)Why doesn’t this app work for me??

A: Make sure it is a winmail.dat file that you are trying to open with this app!

a)Files such as just a .dat (not winmail.dat) are special data files (hence the name!), and only the software which created them can open them. They can’t be opened using this app.
b)A .wmv file is NOT a winmail.dat file, even though it looks similar! It’s a ‘Windows Media Video’ file which can’t be opened with this app.
c)An ‘Untitled Attachment’ or a ‘MIME’ file or an ‘.eml’ file is NOT a winmail.dat file, and this app should not be used to open this type of file.

Also be sure to check that your file has downloaded completely on your iPhone/iPad. Sometimes large files with sizes in MB take time to get downloaded, especially if you are on a slow WiFi network.
(App will only work on fully downloaded winmail.dat files.)

If it still does not work, then re-starting your iPhone or iPad might do the job. And if nothing helps then email me, I will resolve the issue. :-)

2)Why does the app show ‘This is not a TNEF file’?

A: Around 99% of winmail.dat files are created using TNEF encoding, and all the ‘winmail’ apps and software are able to open only these types of winmail.dat files.
The solution to open non-TNEF winmail.dat file has not yet been found, though I am working on it and hopefully should be able to include it in the next app update.

3)How do I open / view / edit the files which are contained inside my winmail.dat file?

A: This app will ONLY open the winmail.dat attachment, but for any file contained inside the winmail file you will either need the functions/default apps of your iPhone or iPad OR you'll need to install other apps to open Word, Excel, PDF, large Image files, zipped files, Audio and Video files.
The Winmail File Viewer app is a simple app to open winmail.dat (TNEF encoded) files, so please don’t expect it to do anything more.

4)Why do I get a ‘Blank page’ when I open the winmail.dat file using your app?

A: Sometimes there is absolutely nothing inside a winmail.dat file except some kind of formatting, fonts, AVG virus scanner info, voting buttons, email read receipts etc. So, if you get a blank page after opening the winmail.dat file please don’t worry because there is nothing wrong with the app. Still, if you need assistance you can contact me via email and I will get back to you within a few hours.

5)Are there any new features planned for this app in the future?

A: Yes, I will be adding lots of new features and functionality to this app in the future, so please keep using it!

App YouTube videos: AND

Kindly give good ratings and reviews if you like this app. Thank you. :)

What's New

Version 1.6

1. Bugs fixed
2. New features added

Ratings and Reviews

2.1 out of 5
8 Ratings
8 Ratings

Excellent Support

Wow! My winmail app suddenly failed to open attachments overnight & I emailed the developer for help
late in the day. I was hopeful for a response sometime in in the future but was so stunned
have an email in the morning from Hiren. The App was just updated the day before and he advised me to simply power off then back on...worked instantly! I use this App to open Purchase Orders from international companies & was back to work in seconds! Thank you Hiren for your unbelievable support!!


A Great Business Tool

I was using this app a lot in conjunction with our business, but it hasn't been updated for IOS 11 and no longer works. I hope the developer will update; I really love the app and found it useful in opening email attachments from my phone that would open no other way.


Used to work now it does not

Loved the app when it worked. Now it won't open any files. When the app tries to open a file it force closes. Going into the app itself is no help as the file is blank.


Hiren Bhatt
3.2 MB
Requires iOS 10.0 or later. Compatible with iPhone, iPad, and iPod touch.
English, Danish, Dutch, Finnish, French, German, Japanese, Korean, Portuguese, Russian, Simplified Chinese, Spanish, Swedish, Turkish, Ukrainian
Age Rating
Rated 4+
© 2010 Hiren Bhatt


  • Family Sharing

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

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