Winmail.dat, MSG, MHT Viewer

15.5K reviews
Content rating
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About this app

Open 📎 Winmail.dat, MSG, EML and MHT files easily and securely

Letter Opener has always been the perfect app to open Winmail.dat and MSG e-mail files—the format used by Microsoft Outlook and Exchange—and also internet standard EML email files. And it’s even easier and more secure with Letter Opener for Android. Your files are never transferred or shared when you use Letter Opener, and your files and content stays protected on your device.

Privacy and security

Privacy and security aren’t just something you should hope for—they’re something you should expect. That’s why we never transfer or shared your files. Everything is done on your trusted device. Your emails stay your business.

Supported file types:

• winmail.dat or AT00001.dat
• Outlook messages: .MSG
• Outlook templates: .OFT
• E-Mail files: .EML, .EMLX
• Web archive files: .MHT, .MHTM, .MHTML

Made with a special 😤 for winmail.dat files.
Updated on
Nov 4, 2020

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App activity and App info and performance
Data is encrypted in transit
Data can’t be deleted

Ratings and reviews

14.3K reviews
Peter Dugstad
May 30, 2020
Never could open any winmail.dat attachment and even when using other winmail opener apps, I had to search for the file after it had been downloaded and try to have it opened with that specific application. It was always a frustrating and time consuming proposition. With this app, the first time was a charm! I opened up an email with a winmail.dat attachment, downloaded the attachment and BINGO! Everything opened automatically! Very pleased!
97 people found this review helpful
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Shaun Orwell
June 2, 2023
Gmail doesn't display .emls properly, but this does (dont have filename extensions as they come, not sure if thats why, but both recognise it as mail regardless) This is simple and does what it needs, the ads are in a small soundless animated banner at top which is super reasonable Came back cos I forgot I'd reviewed already & I use this a lot for how simple it is, and a bunch of the negative reviews are really, really weird. As in, referencing things this app clearly has nothing to do with 🤔
5 people found this review helpful
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Queen Berengaria
August 16, 2020
Installed it because I was looking for something to open the Winmail.dat I get sent monthly by email (a magazine) as an attachment that consistently fails to open. I allowed the app access to my photos and "files" but all it goes to is my photos...I'm not needing to "open" those! What the...? I really don't understand files on a phone; was recommended to download a PDF opener, this seemed to fit the bill, but... Nope, doesn't do it. Uninstalled.
12 people found this review helpful
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What's new

Initial Release 🎉