Alter options in "New..." menu?

Can someone point me towards documentation or explain how to update the contents of the "New..." menu that appears when right clicking on the header bar? I think I even did this on a previous system but I can't for the life of me find a reference to it in the settings or when searching docs. I'm looking to add PostgreSQL as an additional default file type option here and I'm pretty sure that there'd be an option to select from existing known file types. I don't see something that makes sense in the "Edit File Templates..." option.

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