Did you receive an email that included an attachment with 'winmail.dat' in the name. This may happen if the email message was sent to you by someone using a incorrectly configured Microsoft email app like Outlook.
Incorrectly configured Microsofts Outlook e-mail app may send e-mails in the 'Transport Neutral Encapsulation Format' (TNEF), named 'winmail.dat'. This occurred because the sender used the Rich Text message format (like bold, italics etc) encapsulated in the Transport Neutral Encapsulation Format (TNEF), which your OS X Mail app could not recognize.
A TNEF-encoded email message will contain a plain text version of the mail you received. Thus you may simply ignore this attachment.
You will see this as:
Content-Type: application/ms-tnef;
name='winmail.dat'
What if I want to open the Winmail.dat file?
Download free version of OneTime Winmail.dat File Converter will allow users to export Winmail.dat emails and attachments in Mac OS X. The evaluation version of this utility will only transfer the first 5 items of each file. This is one of its own advanced application types that allows users to convert Winmail.dat to Mac Mail. It's very good for real-time measurement, the use of this software is very professional.
Winmail.dat file is a Microsoft proprietary Outlook/Exchange format. The most convenient way to view this file is to use a converter program. There are many available. For instance, this is a free online converter that you may use to open the 'winmail.dat' file.
Another option is to use the TNEF's Enough for Mac OS app, which is also available on the Mac Store.
FAQ Index:
Q: You say Winmail Opener is free of charge. Why it's free? Does it contain spyware or adware stuff?
Q: Do you have a download for Mac OS X? Is there any program (freeware) for Macintosh users (Mac OS X) to open winmail.dat? A: This is a frequent question we receive. We do not develop Mac OS software, and could only recommend a freeware Mac OS application for reading and extracting TNEF-encoded files TNEF's Enough. (We heard from Mac OS users. Once the winmail.dat files are added to its main window, you can easily extract the attachments and save them or even open them into another application. All in all, WinDat Opener is a very reliable OS X application designed to make it as easy and as fast as possible to open, view and save the contents. Download Winmail DAT File Viewer 1.3.1 for Mac from our website for free. Our built-in antivirus scanned this Mac download and rated it as virus free. The software is categorized as Productivity Tools. This free Mac application was originally created by YXH Inc.
A: Winmail Opener is completely free, and it have no spyware or adware bundled. For example, Softpedia assigned '100% clean' award to this software. We believe that our application give you the convenient way to open these inconvenient winmail.dat files, and it always will be free.
Q: I would like to recomend this product to be used in the company where I work. Do I need to have the business manager contact you about a site licence for business, or is it freeware for business as well as home users?
A: Winmail Opener is freeware for both commercial and personal use.
Q: Do you have a download for Mac OS X? Is there any program (freeware) for Macintosh users (Mac OS X) to open winmail.dat?
A: This is a frequent question we receive. We do not develop Mac OS software, and could only recommend a freeware Mac OS application for reading and extracting TNEF-encoded files TNEF's Enough. (We heard from Mac OS users it works well).
Q: Is it possible to install Winmail Opener in silent mode?
A: You can use the following installation package switches and syntax:
winmail_opener.exe [switches]
| Switch | Description |
| /S | Unattended (silent) installation (software will be installed by default in the '%ProgramFiles%/Winmail Opener' folder) |
| /D=c:WinmailOpener | Specify default installation folder |
Q: Is it possible to uninstall Winmail Opener in silent mode?
A: Since version 1.5 you can use the switch /S for running uninstaller without any confirmation messages:
uninst.exe /S
Q: Is it possible to use widcards in batch operations?
How To Open A Winmail Dat File
A: No, Winmail Opener expects only one real filename in the parameters list. But you can achieve this by writing a simple .bat file like our user did (save the text below as run.bat, modify the paths if needed):
Winmail.dat For Mac Os X
for %%a in (c:In*.dat) do wmopener.exe '%%a' 'c:Out'
Winmail Opener For Windows 10
