Winmail Viewer - Letter Opener

Winmail Viewer - Letter Opener

Open Email, MSG & XPS files

4.9K ratings
1028 reviews
Free
In-App Purchases

Details

Released
December 31, 2010
Updated
October 3, 2026

Features

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
iphone
ipad
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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

17.1.2

October 3, 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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Subscriptions & In-App Purchases

Professional

Open Winmail.dat, MSG, XPS files

$49.991 Year
How to cancel Winmail Viewer subscription ⁉️

User reviews

pos

Free?? One time use wants to sell a subscription. DELETED

A game changer

So pleased I found this app as I was tearing my hair out trying to sort this problem. The sender said the problem was at my end and they couldn’t do anything to help. Thank you for saving my sanity

Good

Mui bueno

助かってます

アウトルックの添付資料が開けられなくて困っていましたが、このアプリのおかげで問題なくなりました。

Worked like a charm

Why are taxes always due when you're wildy busy? I'm down to the last day to turn in my info to the accountant, so I was dismayed to see they had sent me a winmail.dat form to fill out, with the blithe suggestion that I "convert it" if I'm using a Mac. Thank goodness for Winmail Viewer, which I just found out about today. I found it on the App Store and downloaded it. It installed a script, and all I had to do was drag the offending .dat doc over to its drop zone screen, and in seconds it had converted it into a normal PDF with the proper filename and everything. It even preserved the security password the accountant had put on the PDF. Thank you, Winmail Viewer!
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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.