Winmail File Viewer

Open winmail.dat.
Get your attachments.

Read the message inside an Outlook winmail.dat file free in your browser. To unlock its attachments, open the original file in Winmail File Viewer for iPhone or iPad with a subscription or credits.

Open winmail.dat online Get the iPhone & iPad app

Free online viewer · No account · Files stay on your device

Why the file appears

Outlook can bundle a message and its attachments into one winmail.dat TNEF container. The web viewer opens the message; the iOS app also extracts the PDFs, documents, spreadsheets, and images inside.

What is a winmail.dat file? →

On iPhone or iPad?

Open the attachment from Mail or Files, tap Share, and choose Winmail File Viewer. It works offline after installation.

Download for iOSSee the five steps →

Guides

How to open winmail.dat on iPhone or iPad Winmail.dat viewer for iPhone: features and pricing Why Outlook attachments aren’t showing More questions? Visit support