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TNEF file extension

The table below provides useful information about the .tnef file extension. It answers questions such as:

  • What is the .tnef file?
  • What program do I need to open a .tnef file?
  • How can the .tnef file be opened, edited or printed?
  • How can I convert .tnef files to another format?

We hope you find this page helpful and a valuable resource!

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

✅ Transport Neutral Encapsulation Format

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
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
TNEF aliases:
TNEF related links:
TNEF related extensions:
Microsoft Outlook E-Mail Message

Microsoft Outlook Express E-Mail

Microsoft Internet News Message

cc:Mail Archive

Novell GroupWise Saved E-Mail

Microsoft Outlook Express v4 Mailbox

Microsoft Restricted Permission Message

Unix Mailbox

Microsoft Outlook Express Folder Database

Microsoft Exchange Non-Delivery Report Body

Other types of files may also use the .tnef file extension.

🚫 The .tnef file extension is often given incorrectly!

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

nef, tef, tne, tnf

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

TablEdit Tablature
Nero BackItUp Encryption File
Nikon RAW Image
Manga Studio Tone
Transport Neutral Encapsulation Format

🔴 Can't open a .tnef file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .tnef file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .tnef file extension, write to us!

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