.TNEF File Extension

.TNEF File Extension

File Type

Transport Neutral Encapsulation Format

Developer Microsoft
Popularity
3.7  |  3 Votes
Category Misc Files
Format N/A

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

Windows
Mac
Included with OS
Updated July 8, 2011

Verified by FileInfo.com

The FileInfo.com team has independently researched the Transport Neutral Encapsulation Format file format and Mac and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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