When you double click J2C files on computer, the associated program will be launched to open the selected J2C file. But you can change it to any program at your pleasure.
a) Select a program to open J2C files on Windows
Right-click on the J2C file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the J2C file opener. If you decide to always open J2C 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 J2C files on Mac
First Get Info about any one of J2C files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your J2C file. Click 'Change All' button to set the selected application as the default J2C file opener app.

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