What does the file association 'open' command line look like?

Alan

>Hi,
>
>I have a problem on an application I wrote. The application is an image viewer/modifier. I can drag files to the shortcut and open them up with the application. I associated the file types to this application. The problem lies when I double click on the file, the application opens but the file does not appear in the application. The parameter is blank at this point. Any ideas? Thank you
>
>Tim