If you find a file with a.dat extension on your computer, it’s simply a generic data file that contains important information about the program used to create the particular file. It can be anything like an email attachment (as winmail.dat files), image or video, a document or even data, which stores information for software to handle. Letter Opener for Windows delivers a powerful Winmail.dat Viewer in an easy-to-use, modern app. Some people still use Outlook. And whenever they send you something like an attachment, it shows up in your Mail with a winmail.dat file attached. (Ugh.) But Letter Opener seamlessly converts all types of Outlook’s irksome winmail.dat files. A DAT file is a data file used by Minecraft, a 3D exploration and construction game. It is saved in a compressed Gzip format and may save various kinds of data, including player inventory, player position, and world information. DAT files are used for saving world state information as well as for tracking player progress. Your.DAT file could be anything like a video file or a document, the best way to determine would be to add different extension in place of.DAT extension and see if it works. To do this, follow the method below. Go to Tools Folder Options and click View tab. Now uncheck the Hide Extensions For Known File Types checkbox and click OK.
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. The strongwilled classmate and other news!. 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.