.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.
Many times when receiving mail attachments with the new Exchange-enabled Microsoft Entourage v.X from Windows users, you will get a winmail.dat file that is inaccessible under Mac OS X. Alan Sill ...
Spotlight: Choking on Finder.DAT files? We've received scattered reports from readers indicating that Mac OS X 10.4.x's Spotlight may have problems indexing and searching for Finder.DAT files -- data ...
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.
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