# Winmaildat Opener

> Utility to open and extract contents from winmail.dat email attachments. (iPhone/iPad app by Maklabu GmbH.)

- Source: https://appshunter.io/ios/app/winmaildat-opener/id596413390 (this page in markdown: same URL + `.md`)
- Developer: [Maklabu GmbH](https://appshunter.io/developer/1317928113)
- Category: Utilities, Productivity
- Price: Free with in-app purchases
- Rating: 3.60/5 from 75 App Store ratings · 280 written reviews indexed
- Age rating: 4+
- Requires: iOS 13.0 · 9 MB
- Languages: American English, French (France), German (Germany), Russian, Chinese (Simplified, China), European Spanish
- Released: 2013-03-12
- Data updated: 2026-07-16
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/winmaildat-opener/id596413390/reviews.md

## What is Winmaildat Opener?

Winmail.dat Opener is a free app to open those common 'winmail.dat' attachments. This app is free of charge and fully functional, giving you access to the files without any need for further in-app purchases. The optional in-app-purchase will remove ads. 

Our app registers as a handler for .dat files. It is launched when you tap to open the "winmail.dat" attachment, enabling you to see a list of its contents. You can then preview, resend or print the contained files or save them to an album.

This app will extract the winmail.dat on your phone or tablet, it does not require an Internet connection for this process. As our app is ad-supported, it has to ask for permission to access the Internet, despite the fact that the actual extraction process does not require an Internet connection. 

Kindly note that not every file ending with .dat is a winmail.dat file. So, before submitting a one star review stating that our service didn’t work, please ensure that your file is indeed a winmail.dat file and not one of a hundred different file types with a .dat extension.

## Key features

- Open winmail.dat attachments
- Preview contained files
- Resend or print files
- Save files to device
- Offline extraction
- Registers as .dat file handler

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Remove Ads | $0.99 | one-time |


## What do users think of Winmaildat Opener?

Overall sentiment: positive

**Pros**

- 👍 Easy to use
- 🚀 Works as advertised
- 💰 Free with no hidden charges
- 📁 Opens winmail.dat files
- 🎉 Solves a common problem

**Cons**

- 🐛 Doesn't work for some users
- 🗑️ Can't delete opened files
- 🔄 Unreliable file handling
- 🔒 Security concerns

**Commonly reported bugs**

- Crashes on certain file types
- Doesn't work with iOS 13 and later
- Fails to open some winmail.dat attachments

**Most requested features**

- Add ability to delete opened files
- Improve file handling and reliability
- Update design to match modern iOS

## Recent user reviews (10 of 280)

All indexed reviews: https://appshunter.io/ios/app/winmaildat-opener/id596413390/reviews.md

### 1/5 — Schade …

*2024-07-08, version 1.6*

… hatte jahrelang treue Dienste geleistet, öffnet aber mittlerweile keine Anhänge mehr. 😢

### 1/5 — Absolutely useless

*2024-02-06, version 1.6*

Does not open Winmaildat files. A complete waste of time.

### 1/5 — Funktioniert überhaupt nicht

*2023-12-19, version 1.6*

Die App funktioniert weder auf meinem IPhone 15, noch auf meinem iPad Pro. Die Datei mit der Endung Winmail.dat wird überhaupt nicht geöffnet…

### 1/5 — Useless ap

*2023-07-25, version 1.5*

Does not work!

### 5/5 — Works as designed

*2023-06-20, version 1.5*

…funktioniert reibungslos. 99 Cent einmalig ohne Werbung. Super Fair

### 5/5 — Winmaildat Opener

*2023-03-28, version 1.5*

iMac ?

### 1/5 — 使えない

*2022-12-13, version 1.5*

全て英語で使い方もわからん。

### 5/5 — Thank You

*2022-05-28, version 1.4*

This inexpensive app works perfectly.

### 1/5 — 最悪です。

*2022-05-09, version 1.4*

課金したが役に立たない。

### 1/5 — Want my money back

*2022-02-12, version 1.4*

It didn’t open a single file whether 43kb or 4.4mb! Not one single file. I want my money back!!

## Frequently asked questions about Winmaildat Opener

### What does Winmaildat Opener do?

Winmaildat Opener is a free utility app designed to open and extract files from winmail.dat email attachments. It allows you to view the contents of these attachments directly on your phone or tablet.

### How do I use Winmaildat Opener?

The app registers itself as a handler for .dat files. When you tap on a winmail.dat attachment, the app will launch, displaying a list of its contents. You can then choose to preview, resend, print, or save these files.

### Is Winmaildat Opener free to use?

Yes, the core functionality of Winmaildat Opener is free and fully functional. There is an optional in-app purchase available to remove advertisements from the app.

### Does the app require an internet connection to open winmail.dat files?

No, the actual process of extracting the winmail.dat file does not require an internet connection. The app may request internet permission due to its ad-supported nature, but the extraction itself is offline.

### What if my .dat file doesn't open?

It's important to ensure that your file is specifically a 'winmail.dat' file. The .dat extension can be used for many different file types. If your file is not a winmail.dat attachment, this app will not be able to open it.

## Version history (last 5 releases)

### 1.6 — 2023-11-16

Optimized for iOS 17

### 1.5 — 2022-06-07

UI Update.
Dark mode.

### 1.4 — 2018-01-24

This app has been updated by Apple to display the Apple Watch app icon.

This update contains minor app improvements.

### 1.3 — 2016-10-20

Chinese translation added.

### 1.2.3 — 2016-09-26

Bugfixes

## Apps similar to Winmaildat Opener

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [Winmail Viewer - Letter Opener](https://appshunter.io/ios/app/winmail-viewer-letter-opener/id411897373) | 4.8 (4,480) | Free | Utilities |
| [PDF Converter and Editor + AI](https://appshunter.io/ios/app/pdf-converter-and-editor-plus-ai/id1274041003) | 4.0 (62) | Free | Utilities |
| [Winmail.dat Opener & Viewer](https://appshunter.io/ios/app/winmaildat-opener-and-viewer/id6758459209) | — | Free | Utilities |
| [Web to PDF Converter & Reader](https://appshunter.io/ios/app/web-to-pdf-converter-and-reader/id581643426) | 4.7 (1,636) | Free | Utilities |
| [PDF Converter - Photo to PDF­](https://appshunter.io/ios/app/pdf-converter-photo-to-pdf/id1644877682) | 4.8 (579) | Free | Utilities |
| [Winmail Viewer – DAT Opener](https://appshunter.io/ios/app/winmail-viewer-dat-opener/id6752894720) | 4.7 (15) | Free | Utilities |

## More apps by Maklabu GmbH

- [Barcode-Studio](https://appshunter.io/ios/app/barcode-studio/id690001095)

All apps by Maklabu GmbH: https://appshunter.io/developer/1317928113

## Related topics

[winmaildat opener](https://appshunter.io/ios/topics/winmaildat-opener) · [windat opener](https://appshunter.io/ios/topics/windat-opener) · [winmail](https://appshunter.io/ios/topics/winmail) · [winmail dat attachment opener apps](https://appshunter.io/ios/topics/winmail-dat-attachment-opener-apps) · [winmail viewer](https://appshunter.io/ios/topics/winmail-viewer) · [winmail dat](https://appshunter.io/ios/topics/winmail-dat)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-16.*