If you have more apps on your Mac that are able to open one type of files, like in our case movies in AVI file format,  you can set your favorite app as default to open these data for example VLC Player instead of QuickTime with a few steps in Finder.Mac OS X Open With

Change default app in OS X with Finder

Click by right mouse button on the file that you need to change default app to open and select Get Info option (also click on file → File option in upper menu → Get Info).

Mac OS X Get Info

Click on Open with: section.

Mac OS X Get Info open with

Select default app from pull down menu.

Mac OS X open with select app

 

Click on Change All... button → Continue button and the new app will be associated with all files with the same type of file extension.

Associate all files with default app

Related software and links:

Apple Finder icon

Apple Finder    Apple macOS / Mac OS X platform
Default file manager in macOS

 
Mac OS X icon

Mac OS X    Apple macOS / Mac OS X platform
Unix-based operating system for Apple Mac computers

 

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