
Selecting RTF as the format for sending an e-mail implicitly enables TNEF encoding, using it in preference to the more common and widely compatible MIME standard. Within the Outlook e-mail client, TNEF encoding cannot be explicitly enabled or disabled (except via a registry setting ). Other TNEF files may contain files which have been attached to an e-mail message. Some TNEF files contain information used by only Outlook to generate a richly formatted view of the message, such as embedded (OLE) documents or Outlook-specific features such as forms, voting buttons, and meeting requests. In most circumstances, you won't even need to leave your e-mail program. Double-click the attached files to open them, or drag-and-drop them on the Desktop. It's completely frustration-free: just double-click the winmail.dat file and you're instantly presented with a list of its contents. An attached file with TNEF encoding is most often named winmail.dat or win.dat, and has a MIME type of Application/MS-TNEF.The official (IANA) media type, however, is application/vnd.ms-tnef.

Transport Neutral Encapsulation Format or TNEF is a proprietary email attachment format used by Microsoft Outlook and Microsoft Exchange Server. (Redirected from Winmail.dat) Winmail.dat Viewer Mac Application
