Winmail Viewer — dat, MSG, EML

Someone sent you a winmail.dat file and nothing on your phone will open it? That happens when Microsoft Outlook or Exchange packs a message and its attachments into a single TNEF file. Winmail Viewer unpacks it instantly — the message, the formatting, and every attachment inside.

OPENS THE MAIL FILES ANDROID CAN'T
• winmail.dat — TNEF attachments from Outlook and Exchange, including ATT0001.dat and similar names
• MSG and OFT — e-mails and templates saved from Microsoft Outlook on Windows
• EML and EMLX — messages saved from Apple Mail, Thunderbird, Gmail and most other mail apps
• MHT and MHTML — complete web pages saved as a single file by Chrome, Edge and Internet Explorer

EVERYTHING A MESSAGE CONTAINS
See the sender, recipients, date and subject. Read the body with its formatting — HTML, plain text, or Outlook's RTF, decoded correctly. Open, save or share every attachment. View the full message headers when you need them. International mail displays properly, whatever the language or encoding.

YOUR FILES STAY PRIVATE
Nothing uploads to the cloud. Nothing leaves your phone. Every file is parsed on your device by the app's own reader — no server ever sees your mail. Remote images in HTML messages are blocked by default, because they are usually tracking pixels; load them only when you choose.

MADE FOR THE EVERYDAY CASE
Tap a winmail.dat in your mail app and it just opens. Share a file to Winmail Viewer from any file manager. Recently opened files are one tap away. Light and dark themes follow your system.

HOW TO OPEN A WINMAIL.DAT FILE
1. Tap the attachment in your mail app, or share it to Winmail Viewer
2. The message and its attachments appear instantly
3. Open, save or share any attachment — done

If a file will not open, it may not be a supported format — the app will tell you rather than guess.