Winmail.dat, MSG, MHT Viewer

Name: Winmail.dat, MSG, MHT Viewer
Rating: 3.991342 (17244 reviews)
Author: Letter Opener GmbH

By: Letter Opener GmbH App

Letter Opener - Open Winmail.dat, MSG, EML and MHT files.

Overview

Google Play Store

Downloads

1,004,517 ▲ 2.12K

Data as of 2026-08-22

Rating:

3.99 ▲ 0.01

(17,244)

Version:

3.3.0

Last updated: 2026-08-18

Ranking

#67,712 ▼ 119

Overall

Features & Capabilities

Securely Open Winmail.dat, MSG, EML, and MHT Files

Letter Opener is the best Chrome extension to effortlessly open Winmail.dat and MSG email files used by Microsoft Outlook and Exchange, as well as standard EML and MHT internet email formats. It operates entirely on your device, ensuring complete privacy—no files are transferred or shared externally.

Privacy and Wide File Support

Designed with your security in mind, Letter Opener guarantees your emails remain confidential. This extension supports a wide range of file types including .winmail.dat, .MSG, .OFT (Outlook Templates), .EML, .EMLX, and web archive files like .MHT, .MHTM, and .MHTML. Experience seamless viewing of complex email files right from your browser.

User Growth & Download Statistics

App Privacy & Security

By:

Downloads:

Rating:

Version:

3.3.0 Last updated: 2026-08-18

Version code:

Creation date:

2020-01-14

Publisher country:

Permissions:

android.permission.INTERNET Low risk
android.permission.ACCESS_NETWORK_STATE Safe
app.letteropener.DYNAMIC_RECEIVER_NOT_EXPORTED_PERMISSION

Size:

11.25MB

Email:

su*****@winmail.help

URLs:

Website ,Privacy policy

Full description:

Source:

Google Play Store

Data ingested on:

2026-08-22

Compare stats and ranking:

Ranking

# 67,712 ▼ 119

For Developers

Monetize with App Pass Boost with Extension Booster

Contact the developer

Chrome-Stats does not own this Android app. Please use these information below to contact the Android app developer.

Developed by:

Letter Opener GmbH

Google Play Store

https://play.google.com/store/apps/details?id=app.letteropener

Email:

su*****@winmail.help

Website:

https://winmail.help

User Reviews

Reviewers broadly praise the app for speed, ease of use, and the ability to open winmail.dat, .eml, and .msg files without ads. However, several users report reliability problems (failure to open files) and unreliable PDF opening, with mixed results across devices. Overall, it's a useful tool for viewing email content outside the client, but it can be inconsistent for some users.

Pros

Opens and views multiple email formats (winmail.dat, .eml, .msg) and attachments quickly.
Fast performance and smooth operation.
Easy to use with a quick, single-click opening experience.
No ads, providing a clean viewing experience.
Helpful for accessing email content outside the email app.

Cons

Reliability issues: some users report it sometimes fails to work or open files.
PDF opening not reliably supported (and winmail.dat issues mentioned in at least one review).
Mixed user experiences: some reviews say it works well, others say it doesn’t.

Recent reviews

Good app.

Ja*****, 2026-08-05

Can't understand why Letter Opener is being killed, but I don't understand media technology. It helps me easily open winmail in my emails. Happy with this service.