File Extension TNEF

By:   |   Amended: November 26, 2018

Microsoft Silver

TNEF File Summary

The TNEF File Extension has one primary file type, Transport Neutral Encapsulation Format format, and can be opened with three distinctive software programs, with the dominant related application developed by Microsoft Corporation (Microsoft Outlook Express software). Generally, these files are considered Uncommon Files.

We have found TNEF files on the Windows, Mac, and iOS operating systems. They are both mobile and desktop device friendly. The TNEF File Extension carries a Popularity Rating of "Low", meaning that these files are scarcely found in most user's file stores.

Interested to learn more about the TNEF File Extension? We encourage you to view the detailed file information below to learn about the software that opens TNEF files, and other troubleshooting tips.

Low
Demand
1674
File Rank

/ 11690

Active

Relevance

26

November

2018

Revised

Open TNEF with FileViewPro

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Known TNEF Files


Dominant TNEF File Type

.TNEF
File Format:.tnef
Classification:Transport Neutral Encapsulation Format

The TNEF files are generated by Microsoft Exchange E-mail applications; they appear as email attachments for email clients which do not recognize the proprietary Microsoft's TNEF format. If the email client does not accept the Microsoft Exchange formatting, the text "application/ms-tnef" may appear.

Author: Microsoft Corporation
Group:Uncommon Files
Folder: HKEY_CLASSES_ROOT\.tnef

Software Programs That Open The Transport Neutral Encapsulation Format:


Microsoft Outlook Express by Microsoft Corporation

Windows
Mac

Apple Mail by Apple

Mac
iOS

Microsoft Outlook by Microsoft Corporation

Windows
Mac

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TNEF Requests


Operating System Rankings

7 (45.73%)
10 (44.56%)
8.1 (5.41%)
XP (2.79%)
8 (0.97%)


Sources of TNEF Problems


Troubles Opening TNEF Files

Microsoft Outlook Express is Not Installed

You encounter an error message such as "%%os%% Can't Open TNEF Files" when trying to open your TNEF. When this happens, it is commonly due to Microsoft Outlook Express missing in %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.


Tip: Another TNEF-related program can be selected to open the file by clicking "Show Apps" and finding the application.


Obsolete Version of Microsoft Outlook Express

Your Transport Neutral Encapsulation Format file is incompatible with Microsoft Outlook Express because you might have the wrong version installed. You will need to download a newer version of Microsoft Outlook Express if you don't have the right version. Your Transport Neutral Encapsulation Format file was probably created by a newer release of Microsoft Outlook Express than what's currently installed your computer.


Tip: Sometimes you can get a clue about the version of TNEF file you have by right clicking on the file, then clicking on "Properties" (Windows) or "Get Info" (Mac OSX).


Regardless, most of the TNEF file opening problems relate to not having the right version of Microsoft Outlook Express installed.


Other TNEF File Issues

Assuming you have the right Microsoft Outlook Express version installed, other problems can prevent you from opening TNEF files. There can be external issues inside of %%os%% that are causing these errors when opening TNEFs. Additional factors include:

  • File references in the Windows Registry for TNEF are wrong
  • Deletion of the TNEF file description from the Registry by mistake
  • Defective install of a TNEF program, such as Microsoft Outlook Express
  • Your TNEF can't be loaded properly (file corruption)
  • Your TNEF has adversely impacted by malware
  • Hardware related to TNEFs has device driver corruption
  • Too many applications are open on your PC to load your Transport Neutral Encapsulation Format file successfully

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