When you double click AC3 files on computer, the associated program will be launched to open the selected AC3 file. But you can change it to any program at your pleasure.
a) Select a program to open AC3 files on Windows
Right-click on the AC3 file and go through 'Open with' > 'Choose default program'. In the pop-up windows, choose a program as the AC3 file opener. If you decide to always open AC3 files with the program, only check the option 'Always use the selected program to open this kind of file'.
![Change the default program to open files](../style/images/win7-open-with.jpg)
b) Select another application to open AC3 files on Mac
First Get Info about any one of AC3 files by right-clicking or Command-I, and click 'Open with' arrow to choose a program to start your AC3 file. Click 'Change All' button to set the selected application as the default AC3 file opener app.
![Change the default program to open files on Mac](../style/images/mac-open-with.png)
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