How open and read winmail.dat files, attachments

More info in here:

http://arvutiturve.wordpress.com/2012/04/10/winmail-dat-reader-kuidas-avada-ja-lugeda-outlook-saadetud-winmail-dat-faile/

Open, convert and save the files on winmail.dat email attachments sent by Microsoft Outlook and Exchange. Easy-to-use graphic interface (no command-line tool). The only that displays the original message subject and body. And FREE!
Winmail.dat files are in fact TNEF attachments (transport neutral encapsulation format) sent by the Microsoft Outlook or Microsoft Exchange applications. Users from other e-mail clients (like Thunderbird or Lotus Notes, Gmail) or platforms (like Android, Apple, iPad or iPhone) cannot natively read them.