Open Winmail.dat, MSG, and XPS files

With just a double-click

See how it works – Replay

Letter Opener for macOS Icon

Try all add-ons 14 days for free.

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Available on the Mac App Store

$19.99 each add-on via in-app-purchase

Add-ons – buy only what you need

Winmail.dat Premium: Access to attachments in winmail.dat files
MSG Premium: Access to attachments in MSG files
XPS Premium: Convert XPS files to PDF files
File Extension Premium: Fix files with the wrong or no extension

What are winmail.dat or MSG files?

These files contain email messages from Microsoft Outlook. Since Macs can’t read them natively, users have to rely on third-party software such as Letter Opener to convert and open them.

What is an XPS file?

It’s a document file from Microsoft Windows. On Macs it has to be converted to PDF format to be readable and useable with all built in applications. Letter Opener does that with a simple double click!

Bring your own email application

Spark, macOS Mail, Airmail, Outlook, Postbox, Thunderbird – open converted email messages in your favorite email app!

Are you using macOS Mail? Check out Letter Opener for macOS Mail.

Letter Opener speaks your language

Fully localized in Arabic, Cat, Chinese, Dutch, French, German, Hindi, Italian, Japanese, Korean, Portuguese, Russian, Spanish and Swedish.


Great Product

Having spent a considerable amount of time and frustration trying to work out how to open a winmail.dat file I found your very efficient app. and within seconds had managed to open the attachment. Hassle free and simple to use. Many thanks.

Immediately solved all my problems!

As soon as I opened it- I was able to solve all my problem with ease!

Winmail.dat Letter Opener

Very handy app & easy to use. Good customer service!
Grateful 2017

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Meet the family

Letter Opener for macOS Mail
Automatically converts and displays winmail.dat files in your macOS Mail app.
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Letter Opener for iOS
Get full-featured winmail.dat viewing power for iPhone, iPad and iPod touch!
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