DAT files received as email attachments can be opened using specialized apps or services such as Winmail.dat Explorer or the Winmail.dat Viewer website.

Index.dat file reader or viewer You can use freeware Index.dat Suite or Index.dat Scanner to view the index.dat file in Windows 7 or earlier. But you will not be able to use these freeware on ...

*.dat files are just a generic label for data files, they arent actually a standard type, it can have ANYTHING in it, that being said theres almost definately a dat file editor for age of kings ...