Change the Default App a File Opens with on a Mac
Want to change what the default app is that launches when you double-click or otherwise open a file from the OS X Finder? It’s easy to do, and you can change any individual files default application by doing the following from the Mac Finder:
- Select the file (or file type) that you want to adjust
- Hit Command+i to “Get Info” on the file
- Click to expand the “Open with” section within that files info screen
- From the pull down menu, select the application you want to open this specific file with
- Close the Get Info window
This will only change the default behavior of that specific file.
Changing Default Apps for All Files of a Format
Going one step beyond a single file association, you can change the default app of all of the chosen files format by being at the same Get Info window, selecting then app, then click on the “Change All” button. This lets you assign something like Preview to always open all PNG files, for example.
Do note that if you click the “Change All” button you will change that file types association across Mac OS X, causing all instances of that file format to open in the application you chose. Even after that has been enacted however, you can still override it on a file-by-file basis by using the aforementioned Get Info trick to alter the relationship between that single file and a given application.