Never Struggle with
winmail.dat Files Again
The #1 iOS app for opening winmail.dat files. Instantly access all hidden attachments, documents, and images from Outlook emails on your iPhone or iPad.
The winmail.dat Problem, Solved
If you receive emails from Outlook users, you've encountered the frustrating winmail.dat file. These mysterious attachments contain important documents that iOS can't open natively.
The Problem
iOS Mail app shows "winmail.dat" but can't open it. Important attachments are trapped inside.
Our Solution
Winmail File Viewer instantly decodes these files, revealing all hidden attachments with one tap.
The Result
Access all your documents, images, and files. Never miss important attachments again.
Why iOS Users Love Our App
Built specifically for iPhone and iPad with features that make handling winmail.dat files effortless
Lightning Fast
Open files in milliseconds. Optimized for iOS performance with no waiting or loading screens.
100% Private
All processing happens on your device. Your files never leave your iPhone or iPad.
Universal Support
Works with all winmail.dat files from any Outlook version. Extract any file type.
Native iOS App
Built with Swift for perfect iPhone & iPad integration. Supports all iOS features.
User Friendly
Simple one-tap operation. No technical knowledge required. Works for everyone.
Always Updated
Regular updates ensure compatibility with latest iOS versions and Outlook formats.
How It Works
Receive Email
Get winmail.dat file in Mail app
Tap to Open
Open with Winmail File Viewer
View Files
See all hidden attachments
Save & Share
Export files to your device
Trusted by Professionals Worldwide
Join thousands of business users who rely on our app daily
"Essential for my business. I receive winmail.dat files from clients daily and this app saves me hours every week."
Sarah Mitchell
Marketing Director
"Perfect app! Works flawlessly every time. Can't imagine dealing with corporate emails without it."
James Chen
IT Consultant
"Simple, fast, and reliable. Exactly what I needed for handling Outlook attachments on my iPad."
Emily Parker
Project Manager
Frequently Asked Questions
What is a winmail.dat file?
A winmail.dat file is created by Microsoft Outlook when it sends emails in Rich Text Format (RTF). It contains the formatted message and any attachments, but can only be opened with specific software.
Why can't I open winmail.dat files normally?
Most email clients and operating systems don't natively support the TNEF format used in winmail.dat files. You need specialized software like Winmail File Viewer to decode and access the contents.
Is my data safe when using Winmail File Viewer?
Yes! All file processing happens directly on your device. We don't upload, store, or have access to any of your files or personal data. Your privacy is completely protected.
What types of files can I extract from winmail.dat?
You can extract any type of file that was attached to the original email, including documents (DOC, PDF, TXT), images (JPG, PNG, GIF), spreadsheets (XLS, CSV), and many more file formats.
How do I prevent receiving winmail.dat files?
Ask senders using Outlook to send emails in HTML or plain text format instead of Rich Text Format. They can change this in their Outlook settings or for individual recipients.
Does the app work offline?
Yes! Once installed, Winmail File Viewer works completely offline. You don't need an internet connection to open and extract files from winmail.dat attachments.
Helpful Resources & Guides
Everything you need to know about winmail.dat files and how to handle them on iOS
How to Open Winmail.dat
Step-by-step guide to opening winmail.dat files on iPhone and iPad
What is Winmail.dat?
Understand TNEF format and why Outlook creates these files
Best iPhone Viewer Apps
Compare the top winmail.dat viewer apps for iOS devices
Missing Attachments?
Fix Outlook attachments not showing on iPhone and iPad
Stop Struggling with winmail.dat Files Today
Join 100,000+ iOS users who never miss important attachments
4.8★
App Store Rating
100K+
Active Users
5M+
Files Opened
Free to try • Works offline • No data collection