Winmail Viewer - Letter Opener

Winmail Viewer - Letter Opener

Open Email, MSG & XPS files

4.5K ratings
497 reviews
Free
In-App Purchases

Details

  • Released
  • Updated
  • December 31, 2010
  • March 19, 2026
Winmail Viewer - Letter Opener screenshot #1 for iPhone
Winmail Viewer - Letter Opener screenshot #2 for iPhone
Winmail Viewer - Letter Opener screenshot #3 for iPhone
Winmail Viewer - Letter Opener screenshot #4 for iPhone
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About

Easily open and view Winmail.dat, MSG, and XPS email files that are incompatible with most email clients. Convert embedded content like appointments and notes into native iOS formats, and access all attachments within these files.

Open Winmail.dat, MSG, and XPS files
Convert appointments, notes, and contacts
Access all attachments
Export files to other apps
iOS native format conversion
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What's New in Winmail Viewer

17.0.0

March 19, 2026

Improved Winmail.dat, MSG and XPS file support. If you like Letter Opener, please consider leaving a review. That helps us a lot. Thanks!

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Subscription plans

Professional

Open Winmail.dat, MSG, XPS files

$49.991 Year
How to cancel Winmail Viewer subscription ⁉️
8

In-App Purchases

$19.99

Winmail.dat Premium

Access to attachments in winmail.dat files

User reviews

it worked!

Not sure how often I’ll need this, but it worked once.

Awesome

Awesome app

Very helpful

I have a few vendors whose invoices always come in a .dat format and it has been rediculous trying to find something that opens them. This is perfect and works great

Scam, do not install.

Says there’s no in app purchases but then tries to make you subscribe when you try and open an attachment.

Fast and simple solution

Works as advertised, and solved a “cant read my stored Outlook emails in Dropbox” problem I had for years. Thank you.

Developer apps

FAQ

What does this app do?

This app allows you to open and view Winmail.dat, MSG, and XPS email files that are typically unreadable by other email applications. It converts embedded content like appointments and notes into formats compatible with your iOS device and provides access to all attachments.

How do I open a Winmail.dat file?

Simply tap on the Winmail.dat file when you receive it, and the app will open it automatically. It then processes the file to make its content accessible, including any attachments or embedded items like calendar events.

Is this app free to use?

The app is free to download and use for basic functionality. However, it offers in-app purchases, suggesting that some advanced features or unlimited usage may require a purchase.

What kind of content can be converted?

The app can convert appointments, notes, and contacts that are embedded within Winmail.dat and MSG files into iOS native formats. This ensures that you can easily integrate this information into your device's native applications.

Can I save or share the opened files?

Yes, the app allows you to export the opened files or their content to another application on your device. This makes it easy to share the information or save it in a different format for later use.