Event double click file saved into custom app

FROM : Davide Scheriani
DATE : Sun Feb 03 17:47:54 2008

hi,
just done the save/load part of my experiment.
The thing is: nw ive got a file, saved with NSArchive,
got my custom mime icon.Everything is cool!

When I double click the file just saved, it open my app and..nothing.
What should I do now? What is the event it start when it open the 
application?
Is there any NS class it handle this event? (open an application 
project file and reload everything)

thank u!