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