Winmail.dat Opener & Viewer

New: Try Demo File — see how fast your winmail.dat attachments get extracted. No file needed, no commitment. Just tap and explore.

CAN'T OPEN THAT WINMAIL.DAT FILE? WE'VE GOT YOU COVERED.

You received an email from someone using Microsoft Outlook, and instead of the attachment you needed, you got a mysterious "winmail.dat" file. Frustrating, right? Winmail Opener solves this problem instantly.

WHAT IS WINMAIL.DAT?

When Outlook users send emails using Rich Text Format (RTF), their attachments and formatting get bundled into a file called "winmail.dat" or "ATT00001.dat" - which Apple Mail, Gmail, and other email apps can't open. Winmail Opener decodes these files so you can access your documents, photos, and more.

100% OFFLINE & PRIVATE

Your files NEVER leave your device. Unlike web-based converters that upload your sensitive documents to unknown servers, Winmail Opener processes everything locally on your iPhone, iPad, or Mac. No internet connection required. No data collection. Just pure privacy.

KEY FEATURES

• Instant Extraction: Open winmail.dat files in seconds
• Complete Privacy: All processing happens on your device
• Works Offline: No internet required for core functionality
• Multiple Formats: Also opens MSG and XPS files
• Calendar Events: Extract iCal appointments and add to Calendar
• Contact Cards: Extract vCards and add to Contacts
• Preview Files: View images, PDFs, and documents before saving
• Easy Sharing: Export attachments via Share Sheet
• Universal App: Works on iPhone, iPad, and Mac

HOW IT WORKS

1. Receive an email with winmail.dat attachment
2. Tap the attachment and choose "Open With" then Winmail Opener
3. See all extracted files in a clean, organized list
4. Preview, save, or share any attachment
5. Done! That's it.

SUPPORTED FILE TYPES

• Winmail.dat (TNEF from Microsoft Outlook)
• MSG (Outlook message files)
• XPS (XML Paper Specification documents)

FREE TO TRY

Open 10 unique files for free - no feature restrictions. If you need unlimited access, unlock it with a single one-time purchase. No subscriptions. No recurring fees. Pay once, use forever.

DESIGNED FOR APPLE

Built with Apple's design principles in mind. Clean interface, system-adaptive dark/light mode, and seamless integration with Share Sheet, Files app, and drag-and-drop on Mac.

PERFECT FOR

• Business professionals receiving corporate emails
• Legal and finance teams working with Outlook clients
• Anyone frustrated by "winmail.dat" attachments
• Mac users who receive emails from Windows/Outlook users

Stop being blocked by incompatible email formats. Download Winmail Opener today and access your attachments instantly.