Best Winmail Dat Attachment Opener Apps

178+ iOS apps curated and reviewed

4.1 avg rating
17 free apps
Updated June 2026

The best winmail dat attachment opener apps on iPhone average 4.1★ across 178+ titles — we've ranked them by what real users actually keep on their phones. Updated June 2026.

Compare top Winmail Dat Attachment Opener Apps (June 2026)

#AppPriceRatingAdsIn-App PurchasesUpdated
1Winmail Viewer - Letter OpenerWinmail Viewer - Letter OpenerFree4.8★ (4.9K)NoYesSep 2026
2Winmail Dat Opener +Winmail Dat Opener +Free3.5★ (18)YesYesAug 2026
3Winmaildat OpenerWinmaildat OpenerFree3.6★ (75)YesYesJul 2026
4Microsoft OutlookMicrosoft OutlookFree4.8★ (9.2M)YesYesSep 2026
5Winmail File Viewer & OpenerWinmail File Viewer & OpenerFree4.1★ (86)NoYesSep 2026
6Winmail OpenerWinmail Opener$0.991.8★ (5)NoNoAug 2026
7Winmail.dat Viewer & OpenerWinmail.dat Viewer & OpenerFree was $1.995.0★ (5)NoYesAug 2026
8Winmail Viewer – DAT OpenerWinmail Viewer – DAT OpenerFree4.7★ (17)NoYesSep 2026

Top Picks for Winmail Dat Attachment Opener Apps

Winmail Viewer - Letter Opener#1

Winmail Viewer - Letter Opener by Letter Opener GmbH

Open Email, MSG & XPS files
Editor's Choice
🔧 Utilities
4.8(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.

Winmail Dat Opener +#2

Winmail Dat Opener + by ElevenThirteen LLC

View windat odt xps attachment
Strong Contender
🔧 Utilities
3.5(18 ratings)
FreeAdsIn-App Purchases
Winmail Dat Opener + screenshot 1
Winmail Dat Opener + screenshot 2
Winmail Dat Opener + screenshot 3
Winmail Dat Opener + screenshot 4
Winmail Dat Opener + screenshot 5
Winmail Dat Opener + screenshot 6

Easily open and view "winmail.dat" attachments received via email. This utility resolves issues caused by different mail program formatting, allowing you to access important files sent from Microsoft Outlook.

Winmaildat Opener#3

Winmaildat Opener by Maklabu GmbH

Worth Considering
🔧 Utilities
3.6😊(75 ratings)
FreeAdsIn-App Purchases
Winmaildat Opener screenshot 1
Winmaildat Opener screenshot 2
Winmaildat Opener screenshot 3

Easily open and access files from winmail.dat attachments on your mobile device. This utility allows you to preview, resend, print, or save contained files without needing an internet connection. An optional purchase removes ads.

What We Love

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

Room to Improve

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

More Winmail Dat Attachment Opener Apps apps to explore

FAQ about Winmail Dat Attachment Opener Apps

What are the best winmail dat attachment opener apps for iPhone?
Winmail Viewer - Letter Opener tops our winmail dat attachment opener apps ranking as of June 2026, with a 4.8-star average from 4.9K App Store ratings, and it's free to download.
Yes — 17 of the top winmail dat attachment opener apps we rank are free to download, including Winmail Viewer - Letter Opener and Winmail Dat Opener +.
Winmail Viewer - Letter Opener has no ads and offers in-app purchases, according to its App Store listing as of June 2026.
We track 178+ winmail dat attachment opener apps on the iOS App Store as of June 2026, ranked by rating, recency, and analysis of real user reviews.
This app allows you to open and view Winmail.dat, MSG, and XPS email files that are typically unreadable by other email applications. It converts embedded content like appointments and notes into formats compatible with your iOS device and provides access to all attachments.
Simply tap on the Winmail.dat file when you receive it, and the app will open it automatically. It then processes the file to make its content accessible, including any attachments or embedded items like calendar events.