Winmail.dat Viewer Pro Edition is described as 'Winmail.dat files are in fact TNEF format (Transport Neutral Encapsulation Format) sent from the senders who are using Microsoft Windows Outlook (1997, 2000, 2003, 2007, 2010) or Microsoft Exchange'. There are four alternatives to Winmail.dat Viewer Pro Edition for Online / Web-based and Windows. The best alternative is winmaildat.com, which is free. Other great apps like Winmail.dat Viewer Pro Edition are Winmail.dat Reader (Free), Winmail Opener (Free) and Letter Opener (Free).
Read, view, open, convert and save the files on winmail.dat email attachments. Easy-to-use. Graphic interface (no command-line tool). Often you can obtain winmail.dat attachment in gmail and then you need this is tool.