How do I unassociate extention types in Windows 8.1 ?

Hello ! I have a problem I modified a .dat extention to be opened with notepad...due of my lack of attention I made notepad the default program, is there any way to unassociate .dat from any programs ? I am running windows 8.1 ! Thank you !

If you want to completely remove the association another way is to create a .txt file on your desktop. Right click on your Desktop and select New>Text Document. Rename the file to Test.exe and save it. Go to Control Panel\All Control Panel Items\Default
Programs\Set Associations. Find the file you want to unassociate completely to say Unknown Application. Select it and click Change Program. Under the "How do you want to open this file" go to "Look for another app on this PC". Navigate to the Desktop and select
your "Test.exe" file. Now it will say the the Current Default is Test.exe. Close the control panel. Now just delete the Test.exe file. Navigate back to Control Panel\All Control Panel Items\Default Programs\Set Associations and check your file. Should say
Unknown application.

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