.MS-TNEF File Extension

.MS-TNEF File Extension

File Type

MS Transport Neutral Encapsulation Format

Developer Microsoft
Popularity
2.7  |  3 Votes
Category Misc Files
Format N/A

What is an MS-TNEF file?

File sometimes generated by Microsoft email programs such as Outlook; saves the message in Microsoft's proprietary TNEF format, which often is not recognized by other email programs; may cause the email to appear with the "application/ms-tnef" text, which is the MIME type for Microsoft Exchange email formatting.

More Information

NOTE: MS-TNEF files are rarely seen with the ".ms-tnef" extension. Instead, they are usually seen with the filename Winmail.dat (.DAT file), which includes the MS-TNEF encoded data.

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Programs that open MS-TNEF files

Windows
Mac
Included with OS
Updated July 8, 2011

Verified by FileInfo.com

The FileInfo.com team has independently researched the MS 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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