However, things changed with Windows 11/10/8. In Windows 11/10/8, Index.dat files are not used by Internet Explorer 10. The indexing functions are being implemented within a Microsoft database system.

Have you ever encountered a strange file with an NTUSER.DAT name on your Windows PC? Don't worry, it's not a virus, but quite an important file. In this article, we'll explain what it is and why you ...

.dat can mean many things. data of any type quite often ends up with these extensions. How about using the app that created them? You can also try viewing them in notepad.