Hello,
unfortunately this is not possible.
Since DIAdem 9 we also have the wish to configure it, but ever got the answer that the new TDM-fomat is the new standard.
For your own you could write a little one-row-script like
Call FileNameGet("NAVIGATOR", "FileRead", DataDrvUser&"*.dat", "DD8x")
and connect it with a SCRIPT - shortcut to start it with e.g. the SHIFT+F1 - keys...
With regards
Sven