Transport Neutral Encapsulation Format

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File Format
Name Transport Neutral Encapsulation Format
Ontology
MIME Type(s) application/vnd.ms-tnef

Transport Neutral Encapsulation Format (TNEF) is a proprietary format used by Microsoft mail software to encode attachments and rich text, instead of more standards-compliant methods such as MIME.

It is usually implemented as an attachment called winmail.dat or win.dat, which Microsoft programs know what to do with, but is a useless and confusing attachment to everybody else (unless they use one of several programs and plugins that have been devised to help non-MS-ers cope with it).

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