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