Is it possible to launch a Silverlight 4 OOB application from a web page? [duplicate]

Question

I'm planning to build a download manager application and would like to be able to launch the application when a user clicks a button the site. The application would obviously already need to be installed on the client machine.

There are a few reasons why this needs to be written using Silverlight, but they're not really relevant to the question. I only mention it so that people don't suggest that I use another technology.

Answer 1

Doing a bit of a mash up from two other posts [1] and [2].

But of course this will only work for Windows not Mac. There you will have to fallback to the @michael-s-scherotter style solution.

private void Button_Click(object sender, RoutedEventArgs e)
{
    if (Application.Current.HasElevatedPermissions && System.Windows.Interop.ComAutomationFactory.IsAvailable)
    {

        string run = "\""%ProgramFiles%\\Microsoft Silverlight\\sllauncher.exe"\" /emulate:"Silverface.xap" /origin:\"http://www.silverlight.net/content/samples/apps/facebookclient/ClientBin/Silverface.xap\" /overwrite";
        dynamic cmd = ComAutomationFactory.CreateObject("WScript.Shell");
        cmd.Run(run, 1, true);

    }
}