When people send messages from incorrectly configured Microsoft Outlook email clients, a file attachment called winmail.dat may be added as an attachment to the message. This file contains formatting information for messages that use Microsoft's proprietary TNEF standard and any attachments sent with the original message. The file is not recognized by other email clients. Because of this, any attachments sent with the original message are not displayed in Thunderbird's message pane.

If you try to open winmail.dat, you will probably be prompted to specify the application that should be used to open the file. Because this file is in a Microsoft proprietary Outlook/Exchange format, you may not have an application installed that can decode this file and display it. Even if your system is capable of displaying the file, it does not contain any useful information.

To prevent this file from being attached to messages, the sender of the message (or their system administrator) can configure various options as described in this Microsoft Support article.

There is also a Thunderbird add-on called LookOut which tries to decode the TNEF attachment (winmail.dat) and display the original attachments in Thunderbird's message pane. This add-on is not provided or supported by Mozilla and its compatibility with future versions of Thunderbird is not assured. The best solution is to contact the message sender and inform them that their copy of Outlook is incorrectly configured as suggested in the Microsoft Support article.

JS files are normally used by webpages and are safe if run in Web browsers. However, Windows will run.JS files outside the browser with no sandboxing.JSE – An encrypted JavaScript file.WS,.WSF – A Windows Script file.WSC,.WSH – Windows Script Component and Windows Script Host control files. Used along with with Windows Script files. I have Nokia Lumia 630 single sim phone. I have video file avseq.dat about 666 MB. I am unable to play this file in any way. Is there any solution? This file isn't shown in Microsoft video app. The dat file extension is also used by Microsoft Internet Explorer for files that contain cached data browsing data. This format was most likely used in some previous version of IE. Each time you open a Web page, your browser creates a cache file (a temporary copy) of the page's text and graphics.

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File Extension Dat Microsoft Visual C++

File Extension Dat Microsoft Office 2010

1. Keep in mind that you must know the exact extension used for the DAT file, as changing the extension to use even a slightly different format (e.g., MP4 instead of AVI) can result in the file breaking: Right-click the DAT file, then click Rename. Select the dat portion of the file's name. Replace the dat section with the file's extension.
2. Hey Brink, I opened a file (tw10428.dat) with Microsoft word instead of renaming it to a BAK file. If you are able to add a BAK file to your list of downloads it would be greatly appreciated. Thanks for all of the hard work and sensitivity you've put into this.