Best .dat Viewer Apps

246+ iOS apps curated and reviewed

3.7 avg rating

19 free apps

Updated October 2026

Out of 246+ .dat viewer apps on iOS, 19 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.

Compare top .dat Viewer Apps (October 2026)

#	App	Price	Rating	Ads	In-App Purchases	Updated
1	Winmail Viewer - Letter Opener	Free	4.7★ (4.9K)	No	Yes	Oct 2026
2	Winmail Viewer - TNEF Opener	Free	—	No	No	Jul 2026
3	Eyenet Viewer	Free	—	No	No	May 2026
4	Winmail Viewer:for DAT,XPS,MSG	Free	2.0★ (1)	No	Yes	May 2026
5	Any: File Explore & Viewer	Free	4.4★ (153)	Yes	Yes	Oct 2026
6	Winmail Viewer – DAT Opener	Free	4.7★ (19)	No	Yes	Oct 2026
7	Winmail File Viewer & Opener	Free	4.1★ (86)	No	Yes	Sep 2026
8	Winmail.dat Opener · Viewer	Free	5.0★ (5)	No	Yes	Oct 2026

Top Picks for .dat Viewer

#1

Winmail Viewer - Letter Opener by Letter Opener GmbH

Open Email, MSG & XPS files

Editor's Choice

4.7(4.9K ratings)

FreeIn-App Purchases

Winmail Viewer - Letter Opener screenshot 1

Winmail Viewer - Letter Opener screenshot 2

Winmail Viewer - Letter Opener screenshot 3

Winmail Viewer - Letter Opener screenshot 4

Easily open and view Winmail.dat, MSG, and XPS email files that are incompatible with most email clients. Convert embedded content like appointments and notes into native iOS formats, and access all attachments within these files.

#2

Winmail Viewer - TNEF Opener by Dylan Perera

Open winmail.dat attachments

Strong Contender

0.0(0 ratings)

Free

Winmail Viewer - TNEF Opener screenshot 1

Winmail Viewer - TNEF Opener screenshot 2

Winmail Viewer - TNEF Opener screenshot 3

Winmail Viewer - TNEF Opener screenshot 4

Winmail Viewer - TNEF Opener screenshot 5

Winmail Viewer - TNEF Opener screenshot 6

#3

Eyenet Viewer by Kyu Seo

Worth Considering

0.0(0 ratings)

Free

Eyenet Viewer screenshot 1

Eyenet Viewer screenshot 2

More .dat Viewer apps to explore

Winmail Viewer:for DAT,XPS,MSG

Winmail Viewer:for DAT,XPS,MSG

Winmail Viewer:for DAT,XPS,MSG

RAR, Winmail.dat Reader, TNEF

This tool allows users to extract, view, and save the contents of winmaildat, msg, and xps files. It provides a complete solution for managing these file types, including viewing all attachments and rich text messages.

Extract winmaildat, msg, xps filesView file contentsSave extracted files

📊 Productivity

Any: File Explore & Viewer

Any: File Explore & Viewer

Any: File Explore & Viewer

Explore, Search, View Files

This app provides comprehensive file management for iPhones and iPads, allowing users to view, share, and organize documents, media, and contacts. It supports a wide range of file formats and offers features like multi-window support and WiFi sharing.

Universal file accessView, share, and delete various file typesMulti-window support

free with in-app purchases

Winmail Viewer – DAT Opener

Winmail Viewer – DAT Opener

Winmail Viewer – DAT Opener

Open Winmail.dat & MSG Files

Effortlessly open and view various email attachment formats, including Winmail.dat and MSG files. Extract embedded documents and images, and manage your files with integrated storage. Supports a wide range of email and document types for seamless access.

Open Winmail.dat, MSG, OFT, XPS/OXPS, and EML filesExtract attachments like PDFs and Office documentsView formatted messages with original layout

Winmail File Viewer & Opener

Winmail File Viewer & Opener

Winmail File Viewer & Opener

Extract files from winmail.dat

Easily open and extract attachments from winmail.dat files on your Apple devices. This app decodes TNEF files, allowing you to view and save hidden email attachments like PDFs and images directly to your device.

Open winmail.dat / TNEF filesExtract hidden email attachmentsPreview common file types

free with in-app purchases

Winmail.dat Opener · Viewer

Winmail.dat Opener · Viewer

Winmail.dat Opener · Viewer

Extract Winmail.dat Attachment

Easily open and extract attachments from Winmail.dat, .msg, and .oft email files directly on your device. This utility offers a private, offline solution with a one-time purchase, ensuring your data never leaves your phone.

Open winmail.dat (TNEF) filesOpen Outlook .msg and .oft filesExtract attachments (photos, PDFs, Word, Excel)

Dat File Viewer. Open Dat File

Dat File Viewer. Open Dat File

Dat File Viewer. Open Dat File

View Dat Video, Image, Audio

Easily open and view .dat files in various formats, including video, audio, text, and PDF. Convert your .dat files locally and offline without needing an internet connection. Select the desired file type and open your .dat content seamlessly.

Open DAT files in any formatView DAT videosConvert DAT to Excel, CSV, Text, Audio, Image, Video, PDF

Winmail.Dat Opener · Win Dat

Winmail.Dat Opener · Win Dat

Winmail.Dat Opener · Win Dat

Open Win Mail Dat File, Windat

📊 Productivity

Winmail.dat Opener & Viewer

Winmail.dat Opener & Viewer

Winmail.dat Opener & Viewer

Open Winmail.dat Files Easily

Dat Unpack - Winmail Viewer

Dat Unpack - Winmail Viewer

Dat Unpack - Winmail Viewer

Open, Extract Winmail Files

📊 Productivity

Dicom Viewer by The IT Crowd

Dicom Viewer by The IT Crowd

Dicom Viewer by The IT Crowd

Medical image & DICOM viewer

Ad-free STL Viewer

Ad-free STL Viewer

Ad-free STL Viewer

by Tibor Vereczi

Lump: Hex Viewer

Lump: Hex Viewer

Lump: Hex Viewer

by David Rifkind

Local Camera Viewer

Local Camera Viewer

Local Camera Viewer

📊 Productivity

Meshly: STL Viewer

Meshly: STL Viewer

Meshly: STL Viewer

STL, OBJ & 3MF · bed fit

by Real Life Data, Inc.

📊 Productivity

Linux NVR Mobile Viewer

Linux NVR Mobile Viewer

Linux NVR Mobile Viewer

by EMSTONE Co., Ltd

Monitor live camera feeds from your NVR/DVR devices. View multiple cameras simultaneously in various grid layouts and control PTZ functions. Receive event notifications for enhanced security.

NVR/DVR device managementLive camera monitoringMulti-camera grid layouts

📷 Photo & Video

FAQ about .dat Viewer

What are the best .dat viewer apps for iPhone?

Winmail Viewer - Letter Opener tops our .dat viewer apps ranking as of October 2026, with a 4.7-star average from 4.9K App Store ratings, and it's free to download.

Are there free .dat viewer apps for iPhone?

Yes — 19 of the top .dat viewer apps we rank are free to download, including Winmail Viewer - Letter Opener and Winmail Viewer - TNEF Opener.

Does Winmail Viewer - Letter Opener have ads or in-app purchases?

Winmail Viewer - Letter Opener has no ads and offers in-app purchases, according to its App Store listing as of October 2026.

How many .dat viewer apps are on the App Store?

We track 246+ .dat viewer apps on the iOS App Store as of October 2026, ranked by rating, recency, and analysis of real user reviews.