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.TNEF File Extension

File TypeTransport Neutral Encapsulation Format

3.7 (3 Votes)
CategoryMisc Files

What is a TNEF file?

File generated by Microsoft Exchange email programs such as Outlook; appears as an email attachment for email clients that don't recognize Microsoft's proprietary TNEF format; may cause the text "application/ms-tnef" to appear in the email if the email client does not recognize Microsoft Exchange formatting.

More Information

NOTE: Transport Neutral Encapsulation Format files with the extension ".tnef" are rare. Instead, unrecognized Exchange messages are usually seen with the filename Winmail.dat (.DAT file).

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Programs that open TNEF files
Updated 7/8/2011

About TNEF Files

Our goal is to help you understand what a file with a *.tnef suffix is and how to open it.

The Transport Neutral Encapsulation Format file type, file format description, and Mac and Windows programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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