[Mono-osx] MonoMac - FileRegistration - FileOpen best practices

[trip]

Sorry I'm new to developing on OSX and wondered if you could give me a little
help. Coming from a Windows environment I'm used to double clicking on a
registered filetype and a new process starting. This doesn't appear to be
the case with OSX, so I was wondering how best to handle this. 

For example, my application is registered with launchservices for ".trip"
files (VIEWER), when this ".trip" file is double clicked I want to start a
new NSWindowController. But creating a new View controller on the FileOpen
results in a crash, (something to do with same thread I think) e.g 

public override bool OpenFile (NSApplication sender, string filename) 
{ 
        System.Console.WriteLine("OpenFile " +filename); 
        var mainWindowController = new MainWindowController(filename); 
        mainWindowController.Window.Center(); 
        mainWindowController.Window.MakeKeyAndOrderFront(this); 
        return true; 
} 

I wondered what was the correct practice for opening multiple files? I
looked at the Document Preset but thats not quite right for me, as my files
arnt documents as such. 

Thanks

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