If the DAT file you're trying to open is text, you can convert the file into text in the Microsoft Excel program by first saving it as a CSV file. Right-click the DAT file on your PC and click "Open." ...

Click "Personal Folder File (.pst)," then "Next." Select from the folders the data to convert to PST and then click "Next." Choose "Replace Duplicates with Items Exported," "Allow Duplicate Items ...

BR><BR>Also, I have these files with the extension *.DAT, I can play them with windows media player but they dont seem to be recognised as a valid format.