C9R File Associations got changed

Opened a .C9R file with another program, now this type of file changed it association.

How can I change it back to default? I know that the fact that it got changed isn’t a real problem, but I would prefer to get everything back to the default.

Thanks in advance

File type association is handled by the OS.
For windows: How to Change File Associations in Windows 10 | Digital Trends

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