You may not spend much time thinking about the default apps you’ve got set up on macOS until they suddenly get configured the wrong way — and you find that, say, the app that pops up when you click on an image file is not the one you want to use. 

Out of the box, your Mac will use Apple’s own tools for most tasks: click on a web link in Mail and you’ll see Safari, for example, or double-click on an image you’ve downloaded to your system and up pops Photos. However, you might want…