It is common, though, want or need to use a different program to open a particular type of file. This tutorial will explain how to open a file using a different program than the default one.

When you double-click a file on your Mac, the operating system will automatically open the file using the program assigned to that type of file. It is possible, though, to open the file using ...

Click Open. If the app that you want to use to open the file type is greyed out, it's because macOS doesn't think there's a valid association between the two.