What is a .dat file? How to read and open .dat file? .dat file is a file with arbitrary data, it means it is not associated with any particular programs. There can a number of reason for this, it could have been data error due to file transfer or the .dat file is meant to be shared among various programs.
How to open a .dat file?
The best method is to use the original program that creates it in the first place. First, you’ll have to change the file extension. To do this, follow the tutorial below:

How do know which program the .dat file is associated? At step 3 as shown in the screenshot above, Windows web service will try to identify the file extension. If all else failes, there is no possible way of telling it, you got to ask the person who creates it.
How to change a file extension?

Step 1 – Go to ‘My Computer’ –> ‘Tools’ (a dialog box will appear) –> ‘Folder Options’ –> ‘View’ –> Uncheck ‘Hide Extension for Known File Types’

Step 2 – Rename the file extension from ‘.dat’ to the extension of the associated program.
Next / Part 2: How To Rename And Change A File Extension In Windows XP And 7
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