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Details of extension .tnef

1 extension(s) and 0 alias(es) in our database

Below, you can find answers to the following questions:

  • What is the .tnef file?
  • Which program can create the .tnef file?
  • Where can you find a description of the .tnef format?
  • What can convert .tnef files to a different format?
  • Which MIME-type is associated with the .tnef extension?
Transport Neutral Encapsulation Format .tnef file icon

Transport Neutral Encapsulation Format

The TNEF file is a Transport Neutral Encapsulation Format file. Transport Neutral Encapsulation Format (TNEF) is a Microsoft proprietary method for encoding Rich Text Format (RTF) messages sent across the Internet. A TNEF-encoded message contains a plain text version of the message, an attachment that contains the RTF version, and any OLE objects such as pictures or other attachments that were sent with the message.
Category: Data files
Program name: -
Mime-type: application/octet-stream
Magic bytes (HEX): -
Magic string (ASCII): -
Related extensions:
.mlog Microsoft Outlook Message Log
.dbx Microsoft Outlook Express Folder Database
.eml Microsoft Outlook Express E-Mail
.kfl Microsoft Outlook Known Feed List
.bdr Microsoft Exchange Non-Delivery Report Body

Other types of files may also use the .tnef file extension. If you have helpful information about .tnef extension, write to us!

Is it possible that the filename extension is misspelled?

We found the following similar extensions in our database:

.tef TablEdit Tablature
.tnf Transport Neutral Encapsulation Format
.nef Nikon RAW Image
.tne Manga Studio Tone

The .tnef filename extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

tef (1), tne (1), nef (1)

Can't open a .tnef file?

If you want to open a .tnef file on your computer, you just need to have the appropriate program installed. If the .tnef association isn't set correctly, you may receive the following error message:

Windows can't open this file:

File: example.tnef

To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select from a list of programs that are installed on your computer.

To change file associations:

  • Right-click a file with the extension whose association you want to change, and then click Open With.
  • In the Open With dialog box, click the program whith which you want the file to open, or click Browse to locate the program that you want.
  • Select the Always use the selected program to open this kind of file check box.

Supported operating systems

Windows Server 2016/2019/2022, Windows 7, Windows 8, Windows 10, Windows 11, Linux, Mac OS X, macOS, iOS, Android