Files with tnef extension are used by Microsoft Outlook Express program. They include some text formatting data.

Detailed description

Software that open tnef file

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TNEF file extension - Transport neutral encapsulation format file

What is tnef file? How to open tnef files?

File type specification:

Text file type icon Text file type

tnef file icon: tnef filetype icon

The tnef file extension is associated with Microsoft Outlook Express, an e-mail and news client included in earlier releases of Microsoft Internet Explorer. The latest edition of Outlook Express is called Microsoft Mail Live.

The .tnef files contains rich text formatting used in Microsoft Exchange e-mail messages, such as bold, italics, underlining, etc..

Mime type: application/ms-tnef

The default software associated to open tnef file:

Microsoft Outlook Express icon

Microsoft Corporation logoMicrosoft Outlook Express  Microsoft Windows software

Company or developer:
Microsoft Corporation

Microsoft Outlook Express is an e-mail client distributed with Internet Explorer from version 4.0 to version 6.0. It is also pre-installed in several versions of Microsoft Windows, from Windows 98 to Windows XP.

Outlook Express is user-friendly and easy to use application, which supports standard POP, IMAP accounts, composing rich HTML e-mails, e-mail encryption, privacy protection, malware protection, e-mail sorting etc.

In Windows Vista is Outlook Express replaced with Windows Mail.

Help how to open:

Files with tnef extension are not meant to be opened manually by the user.

How to convert:

It is not convertable file format.

Related links:

Transport Neutral Encapsulation Format

List of recommended software applications associated to the .tnef file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open tnef file, edit tnef file, convert tnef file, view tnef file, play tnef file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with tnef file - Transport neutral encapsulation format file

Click on the software link(s) for more information. Suggested software applications use tnef file type for internal purposes and/or also by different way than common edit or open tnef file actions.

Microsoft Windows:

Main software associated with tnef file by default:
Microsoft Outlook Express small icon Microsoft Outlook Express
Other suggested software:
Microsoft Office small icon Microsoft Office

Apple macOS / Mac OS X:

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TMX file extension > Text file types

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