> I saved the project using NSArchiver with an extension say .myExtension. And
> also I opened the saved project by unachieved it from menu. Now I need to
> open the saved project when double clicking on it.
> 
> How can I do this file association?

See the Runtime Configuration Guidelines:
<http://developer.apple.com/documentation/MacOSX/Conceptual/BPRuntimeConfig/Articles/PListKeys.html#//apple_ref/doc/uid/20001431-101685>

> Where I need to write code for unarchiving its content ?

You should read about the Cocoa document architecture:
<http://developer.apple.com/DOCUMENTATION/Cocoa/Conceptual/Documents/Documents.html>

-Ben
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