Open Winmail.dat Attachments Files on iPhone & iPad with TNEF Enough

Apr 25, 2016 - 8 Comments

Opening winmail.dat files in iOS Mail on iPhone and iPad

iPhone and iPad owners who regularly receive emails from Windows-based users may find ‘winmail.dat’ files attached to the email messages, a file type which can struggle to identify or open. Since winmail.dat files can be anything from a simple styled rich text email, to a calendar invite, vcf contact card, or even a legitimate email attachment, it can sometimes be necessary to open and read the winmail.dat file in iOS, which is what we’re going to show you how to do.

The ability to read, open, and interpret winmail.dat files in iOS Mail app is natively missing, for now anyway, but similar to opening a winmail.dat file on the Mac side of things, you can use a third party app to accomplish the task. It’s free and easy to use too, here’s how it works:

How to Open Winmail.dat Attachments in iOS Mail

TNEF’s Enough will open, read, and allow access to any data contained within a winmail.dat attachment file that has been encountered in the iOS Mail app, the process is the same on any iPhone, iPad, or iPod touch.

  1. Exit Mail app in iOS
  2. Click here to download TNEF’s Enough from the iOS App Store
  3. Re-launch Mail in iOS and open an email containing the winmail.dat attachment file
  4. Receiving winmail.dat attachment files in iOS Mail and reading them

  5. Tap on the “winmail.dat” attachment file and choose “Copy to TNEF’s Enough”
  6. Opening the Winmail.dat attachment file in Mail for iOS

  7. Assuming the file is readable, TNEF’s Enough will open in iOS and show you a list of items contained within the winmail.dat attachment
  8. Opening a winmail.dat attachment file in iPhone

Vcards and calendar files can be accessed and imported just like they would be able to if encountered elsewhere in iOS.

If you don’t want to install the app onto your iPhone or iPad, you can use Handoff to move the open message to a Mac with the TNEF utility installed instead, or use the various tips here to open and read winmail.dat files received in Mac OS X.

Know of another easy method of opening or reading winmail.dat attachments and containing files in iOS? Let us know in the comments!


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Posted by: Paul Horowitz in iPad, iPhone, Tips & Tricks, Troubleshooting


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  1. Patrick says:

    Another alternative is winmail file viewer –

    I’m using it and find it very good, handled all my winmail.dat files no problem

  2. Heidi Murray says:

    Worked wonderfully

  3. Angelo says:

    Keeps crashing every time I try to import the document

  4. Brendan says:

    Superb. I’ve been using this on Mac and hadn’t thought to check for an iOS version. Why use it? I get lots of email from Outlook users where the attachments proper (PDF, XLS) get wrapped into a winmail.dat file. These can only be viewed on Mac or iOS after using an app like TNEF’s Enough.

  5. Michelle says:

    I downloaded it to my iPhone 6 and when I click the attachment I don’t have the “copy to TNEF’s Enough” showing up

  6. DCJ001 says:

    Why would anyone want to open Winmail.dat attachment files?

    • Paul says:

      Winmail.dat files often contain calendar invites, office files, contact cards, and other information from a Windows user. The Mac and iOS Mail clients do not render them properly so they often show up as winmail.dat, depending on how the sender in the Microsoft world attached the files initially.

  7. Wharf Xanadu says:

    I installed the tool and am using it now. Its good. I also am using the end Microsoft key oss tovlars tl see if my typing in yopd is any better but so far it doesn’t seem jiu. Faster

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