Right click on one of the .dat files, click "Open With", and
when the menu opens, select the Notepad or Wordpad program
from the menu, if it appears.
If the program you want isn't in the menu, go to the bottom
of the menu and select "choose program.'
IF you want the association to be permanent (so that XP
uses Notepad / Wordpad automatically the next time and all
subsequent times until you change it)
also be sure you tick the "always use the selected program
to open this type of file." at the bottom of the menu.
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