If you are a new Mac user and not sure how to make it happen, here’s how to change a file type’s default app when you open it. Change the default app when opening. When you want to change the default app for a file you’re opening, you can do this in

Mail is likely the default email app on your Mac, but just in case you have others downloaded, you can set the default reader. Here's how: Launch Mail from your dock or the Finder. Click Mail in the menu bar at the top of the screen. Click Preferences

Click this and you'll see the default app associated with this file type. Now click on the dropdown menu, select a new default, then click the Choose All button. From now on, all files of that ...