Hi Specktech, so on Windows when you right click on the file in a File Explorer window, there will be a menu that pops up which has an "Open with" sub menu under it.

Go into the "Open with" sub menu and at the bottom of it there's a menu item "Choose default program..." . Pick that to open up a dialog that will allow you to set the default program. Set the "Always use the selected program to open this kind of file" checkbox on the dialog.

This stuff is called "File associations" and there is some more info on setting them here:
https://www.lifewire.com/how-to-change-file-associations-in-windows-2624477

- Michael