Open Winmail.dat, MSG, and XPS files

With just a double-click

See how it works – Replay

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Bring your own.

Open converted email messages in your favorite email application.

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

What’s in a Winmail.dat or MSG file?

An email message from Microsoft Outlook.

What is an XPS file?

A document file from Microsoft Windows, like an Adobe PDF (Portable Document Format) file.

Letter Opener speaks your language.

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


It just works. I have been using this app for years. Opens up when needed and quickly converts .dat files. Highly recommended!

Perfect · Always opens PC to Mac attachments! Very useful for our firm’s technology mix.

Very easy to use, opens winmail.dat attachments effortlessly to recover attachments within
Mr. Zinc

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Meet the family.

Letter Opener for macOS Mail

Seamlessly and automatically converts winmail.dat files right inside your macOS Mail application.

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Letter Opener for iOS

Get full-featured winmail.dat viewing power for iPhone & iPad that doesn’t feel like you left something important back at the office.

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