File Extension Library

.MS-TNEF File Extension

  • Developer by: Microsoft
  • Category: Misc Files

What are .MS-TNEF files and how to open them?

Can't open .MS-TNEF file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .MS-TNEF file.

What is a .MS-TNEF file extension?

.MS-TNEF file extension is created by Microsoft. .MS-TNEF has been classified as Misc Files.

.MS-TNEF is MS Transport Neutral Encapsulation Format

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.

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.

List of all softwares that can open the MS Transport Neutral Encapsulation Format
Microsoft Outlook 2016
Microsoft Outlook Express
Apple Mail
Microsoft Outlook 2016

How to fix problems with .MS-TNEF files

  1. You need to update the application that you normally use to open .MS-TNEF files. Only the latest version of the software supports the current .MS-TNEF file format
  2. You need to check the .MS-TNEF file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)