Question

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Filetype association with application (C#)

I’m writing a C# Windows app to visualise and modify ‘.build’ files (nant scripts). I would like the user to be able to right click on a .build file in windows explorer and select the ‘Open With >’ option to allow the file to be modified in my app.

What does my program need to support in-order to work with this mechanism?
What might my program need to do to Windows to enable context menu support?

I was wondering if anyone could point me in the direction of a good article/tutorial on this subject.

Answer 1

The Open With command just passes the path of the file as the first argument to the application so all you need to do is

public static void Main(string[] args)
{
    if(args[0] != null)
    {
       //args[0] contans a path to the file do whatever you need to do to display it
    }
    else
    {
       //Start normally
    }
}

To automaticly put your program in the open with list you will need to add some reg keys in HKEY_CLASSES_ROOT\YOUR_EXT\. Here is a SO answer saying how to do it

Or you could just add it by hand to the open with list the normal way.