When you double click MOV files on computer, the associated program will be launched to open the selected MOV file. But you can change it to any program at your pleasure.
a) Select a program to open MOV files on Windows
Right-click on the MOV file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the MOV file opener. If you decide to always open MOV files with the program, only check the option 'Always use the selected program to open this kind of file'.

b) Select another application to open MOV files on Mac
First Get Info about any one of MOV files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your MOV file. Click 'Change All' button to set the selected application as the default MOV file opener app.

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