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.

Go to File Explorer and browse to C:\Users\*YourUserName* If you don't see NTUSER.DAT yet, it's okay. Microsoft has hidden it so users don't edit or delete it. You can turn on the Show Hidden Files ...

The WebCacheV01.dat file in the C:\Users\username\AppData\Local\Microsoft\Windows\WebCache folder in IE11 in Windows 11/10 is said to be playing a similar role.

Tokens.dat file in Windows 11/10 is a digitally signed file, which stores most of Windows activation files. Learn how to rebuild Tokens.dat file in Windows.

A buggy McAfee DAT file that issued false positives Wednesday affecting SAP telephone connectivity is chipping away at channel trust and calling into question the company's QA processes.