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Usually when a program in installed, you can click on a file of that type and the file will open in the program.

For example, in Excel, you click on an .xls file, and Excel boots up and opens the program.

I know the file association (e.g. .xls is Excel) would be done by an installer.

In C#, how does the file get opened and displayed? I presume there is a method that is called in such situations?
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You have to associate the file extension with the application. You can do this in your setup project. Google is your friend.

Word of caution - you should probably try to ensure that your file extension is unique. You will have more luck with this if you use more than three letters for the extension. For example, instead of ".txt", use ".txt123".
 
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