plugin LookOut or its successor LookOut (fix version) – Mozilla Thunderbird extension. See also: LookOut project page at MozDev.org Bug 77811 – Inline viewer for Microsoft proprietary mail formats, a 21-plus-year-old bug report at the Mozilla Bugzilla Wireshark – Version 1.2 and later can open and dissect winmail.dat files, although it is not useful as a mail reader Unix-like or POSIX command-line yTNEF – GPL TNEF extractor from the POSIX command-line, designed specifically for reading winmail.dat TNEF – GPL TNEF extractor from the POSIX command-line KTNEF – GPL TNEF extractor by KDE Mac Klammer – Shareware for Mac OS X, available on App store; also supports MSG files MailRaider Pro - Application for Mac OS X, available on App store; also supports MSG files Winmail Viewer – Shareware Winmail.dat viewer for Mac OS X 10.6 or later, available on App Store, support open Microsoft Outlook (1997, 2000, 2003, 2007, 2010). Winmail.dat files, can extract and save Winmail.dat attachments TNEF's Enough – Freeware decoder for Mac OS 9 and Mac OS X tnefDD – Free GPL decoder with drag-and-drop functionality for Mac OS X TNEF – MacPorts version of the TNEF command-line decoder Mac OS X Letter Opener (previously known as OMiC) – Shareware, plugin for Apple Mail iPhone and iPad Winmail File Viewer – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to save and share extracted files WinMail.dat Viewer - Browse Outlook winmail.dat files – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to view, save and share extracted files Winmail File Viewer+ – Paid universal app for the iPhone, iPod Touch and iPad to open winmail.dat attachments with option to save and share extracted files Klammer - open EML, MSG and Winmail.dat files – Paid universal app for the iPhone, iPod Touch and iPad with in-app purchase to provide functionality WinDat Opener – Paid app for the iPhone, iPod Touch and iPad Letter Opener – Free Universal app for the iPhone, iPod Touch and iPad with in-app purchase to provide functionality TNEF's Enough - Free Universal app for iPhone, iPod Touch, and iPad Microsoft Windows Winmail.dat Reader – Freeware easy-to-use decoder Winmail Opener – Freeware decoder tnef2win – Freeware decoder Free File Viewer – Freeware decoder fentun – Freeware decoder Winmail.dat Viewer – modern Windows 8 app (non-free) Android TNEF Extractor –