Can any one tell me how to open .dat file.

Found this on the internet.

What Is a DAT File?
In short, a DAT file contains important information for software to handle. The information contained inside a DAT file is usually either plain text or binary, although in rare cases you might encounter them as the actual data of a video file for programs like VCDGear or CyberLink PowerDirector.

Many programs create, open, and reference DAT files. They designed only for use by the application and not to be opened manually by the user. Many games, like Minecraft, use DAT files to store chunks of levels, which are loaded on the fly as a player navigates throughout the level.

How Do I Open a DAT File?
Because it’s difficult to tell whether the DAT file you’re dealing with contains text, pictures, videos, or config files for software on your computer, how you open a file will vary depending on what information it contains. Most of the time, though, DAT files are in plain text format, and you can open those with any standard text editor.

Using a Text Editor
We’re using Notepad++ for Windows as an example here, but you can open a DAT that contains text with any text editor, no matter what operating system you’re using. The process might be a bit different for opening the file, but it’s not complicated.

In Windows, right-click DAT file you want to open and then click the “Open With” command. Then select "Notepad"