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Hello Jeamfeaterii, and welcome to Seven Forums.
You could download and merge the dat option in the tutorial below to fix this. It will restore the default associations for the dat file extension.
Default File Type Associations - Restore
Hope this helps,
Shawn
Go to Control Panel > Under "Programs" click the blue text "Uninstall a program"
The file you are trying to use is not an uninstaller. Its just a data file of data.