When sending plain text or HTML format messages, some versions of Outlook (apparently including Outlook 2000 ) prefer MIME, but may still use TNEF under some circumstances (for example, if an Outlook feature requires it). ![]() Selecting RTF as the format for sending an e-mail implicitly enables TNEF encoding, using it instead of 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 only by 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. ![]() The official ( IANA) media type, however, is application/vnd.ms-tnef. ![]() An attached file with TNEF encoding is most often named winmail.dat or win.dat, and has a MIME type of Application/MS-TNEF. Transport Neutral Encapsulation Format or TNEF is a proprietary email attachment format used by Microsoft Outlook and Microsoft Exchange Server.
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