You can open .DAT files that contain text, with text editors, like Notepad, Notepad++, VS Code, etc. But it is not possible to know what contains in a DAT file.

How to Open a .DAT File. .DAT is a commonly used file extension for saving generic data records. The information contained within a .DAT file depends on the program used to create it, but it will ...

If you're having trouble opening a DAT file, I'll show you a simple and free way to do it. This method works on both Mac and PC. Just open your browser and go to winmaildat.com. It's a ...

What is the deal with those winmail. dat files? I get them in my email all the time, and nothing seems to be able to open them.

If the DAT file is a video, you can open it with its associated video app. However, if you aren't sure what app it's intended for, VLC Media Player should be able to open it as well.