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  • Winmail.dat Opener: MSG Viewer screenshot 1
  • Winmail.dat Opener: MSG Viewer screenshot 2
  • Winmail.dat Opener: MSG Viewer screenshot 3
  • Winmail.dat Opener: MSG Viewer screenshot 4
  • Winmail.dat Opener: MSG Viewer screenshot 5

About Winmail.dat Opener: MSG Viewer

Got an email with a winmail.dat file instead of your attachments? This app opens it and gives you the files back.

HOW IT WORKS
1. Tap the winmail.dat attachment in Gmail, Outlook or any mail app and choose Winmail.dat Opener. Or open the app and tap Open a file.
2. See the email and every file that was inside it: PDFs, Word and Excel files, photos and more.
3. Tap Save all. The files go to Downloads › Winmail Opener on your phone.

WHAT IT OPENS
• winmail.dat files, also called ATT00001.dat or noname.dat
• Outlook .msg files, including emails attached inside other emails
• Emails in any language, including Chinese, Japanese and Korean

WHAT YOU CAN DO
• Read the whole email as it was sent, pictures included
• Preview photos before you save them
• Open any file in another app, or share it
• Save every file at once
• Open recent files again in one tap

WHY YOU GOT A WINMAIL.DAT
Outlook sometimes packs an email and its attachments into one winmail.dat file. Gmail and phone mail apps cannot read it, so your attachments look missing. They are all still inside, and this app takes them out.

PRIVATE AND OFFLINE
Files are opened on your phone. Nothing is uploaded anywhere.

Free to use. One small payment removes the ads.

What’s new

Version 1.0.0 · Updated October 17, 2026

Opens straight away on every phone.

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