OSX/MacOS Search priority for app when opening custom extension
You can choose which application must handle a file type. And change the default application. 

You can do it once:


Right mouse click on file
Open with...
It opens the file in the chosen application once. 




Or you can decide which application must open all files for a particular file type. 


Right mouse click on file
Get Info
Section 'Open with'
Choose the application you want to use for all files from this file type. 
Press the 'Change All...' button