Winmail.dat Opener is made and published by Tobias Reinhardt. AppBrain is an independent app data site and isn't affiliated with Tobias Reinhardt. The app name, icon, screenshots and description belong to Tobias Reinhardt and are shown as published on Google Play.

Pros & Cons

On-device processing protects privacy and enables offline use
Free to use with unobtrusive ads; no mandatory purchases
Lightweight app (~3 MB) with quick install and launch
Focused tool for viewing and handling winmail.dat attachments

Narrow feature scope compared to competitors offering broader document support (PDF, DOCX, XLSX, etc.)

About Winmail.dat Opener

Winmail.dat Opener is a tools app developed by Tobias Reinhardt.

How many times has Winmail.dat Opener been installed?

Winmail.dat Opener has been installed 4.3 million times. In the last 30 days, the app was installed 3 thousand times.

What is the rating of Winmail.dat Opener?

Winmail.dat Opener is rated 2.66 out of 5 stars, based on 4 thousand ratings.

Is Winmail.dat Opener free?

Winmail.dat Opener is free. The app size is 3.98 MB. The latest version available is 4.0.1. The last update was on November 6, 2023.

What are the requirements for Winmail.dat Opener?

Winmail.dat Opener requires Android 8.0+ or higher. The app has a content rating of Everyone. The app has been available on Google Play since October 2012.

Description by Tobias Reinhardt (from Google Play)

Do you sometimes get "Winmail.dat" files containing important documents? Winmail.dat Opener is a free app that allows you to open these files and view, save or share their contents.

More data about Winmail.dat Opener

Price	Free
Total installs	4.3 million
Recent installs	3 thousand
Rating	2.66 based on 4 thousand ratings
Ranking	Not ranked
Version	4.0.1
App size	3.98 MB
Number of libraries	14
Designed for Android	8.0+
Suitable for	Everyone
Ads	Contains ads

App Performance Report

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Screenshots

Screenshots by Tobias Reinhardt, from the Google Play listing

Official page on Google Play

Alternatives to Winmail.dat Opener

Google Play Rating history and histogram

1.1K

320

600

160

1.8K

Installs over time

Winmail.dat Opener has been installed 4.3 million times. Over the past 30 days, it averaged 99 installs per day.

Changelog of Winmail.dat Opener

Show changelog

Developer information for Tobias Reinhardt

Tobias Reinhardt

kontakt@t-reinhardt.ch

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Comments on Winmail.dat Opener for Android

★★★★★ Wolfgang Riss · Sep 6, 2025

Works well, so far. The only thing that feels superfluous is having to grant access rights for the same folder every time you save an attachment. As for ads, I'd rather pay for an ad-free premium version.

★★★★★ Stefan Agner · Dec 29, 2024

Opens winmail.dat files from Thunderbird mail app just fine. Nice and clean app!

★★★★★ Raymond Dale · Nov 8, 2020

I need this app to see some mail in my email box. Very useful app

★☆☆☆☆ Frankie Neuhoff · Mar 8, 2021

It didn't work! I still couldn't open the attachment!

★☆☆☆☆ Dru Greene · Feb 11, 2025

After I installed this app, I still get the message that there's no app on my phone to open the document I've downloaded

★☆☆☆☆ illuzion · Apr 21, 2021

It clearly shows that the file type is .DAT type it still shows, it is not a .DAT type file. **PATHETIC APP**

Google Play Rankings for Winmail.dat Opener

This app is not ranked

Technologies used by Winmail.dat Opener

10 permissions · 14 libraries

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Winmail.dat Opener