how to get Windows 10 to files reuse same Teradata SQL Assistant window when launching .sql files

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how to get Windows 10 to files reuse same Teradata SQL Assistant window when launching .sql files

Currently, I believe that for everyone in my organization, clicking on a .sql file will open the file in a new Teradata SQL Assistant window/instance. How do we change this so that the file opens in the original window/instance?