Return to Question

EDIT: I found an issue with some of the other code I had thought was working. The call to GetProcessesByName() was not finding the process because I was looking for the executable name, which was not the process name. That caused the code I thought was running and failing to actually not execute at all. I thought it was working because the external app will apparently also detect that a copy is already running and try to activate that current instance. I dropped the ".exe" from the process name I search for and now the code executes; however that seems to be a step backwards, as now the taskbar button isn't even highlighted when I call ShowWindow[Async]. So, I now know that neither my app, nor the external app I'm invoking, can change the window state of a different instance programmatically in Win7. What's goin' on here?

//The app is named uniquely enough that it can't be anything else,
//and is not normally launched except by this one.
//so this should normally return zero or one instance
var processes = Process.GetProcessesByName("ExternalApp.exe");

        if (processes.Any()) //a copy is already running
        {
            //I can't currently tell the window's state,
            //so I both restore and activate it
            var handle = processes.First().MainWindowHandle;
            ShowWindow(handle, SW_RESTORE); //GRR!!!
            SetForegroundWindow(handle);
            return true;
        }

        try
        {
            //If a copy is not running, start one.
            Process.Start(@"C:\Program Files (x86)\ExternalApp\ExternalApp.exe");
            return true;
        }
        catch (Exception)
        {
            //fallback for 32-bit OSes
            Process.Start(@"C:\Program Files\ExternalApp\ExternalApp.exe");
            return true;
        }

[DllImport("user32.dll")]
    private static extern int SetForegroundWindow(IntPtr hWnd);

    private const int SW_SHOWNORMAL = 1;
    private const int SW_SHOWMAXIMIZED = 3;
    private const int SW_RESTORE = 9;

    [DllImport("user32.dll")]
    private static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

...

//The app is named uniquely enough that it can't be anything else,
//and is not normally launched except by this one.
//so this should normally return zero or one instance
var processes = Process.GetProcessesByName("ExternalApp.exe");

        if (processes.Any()) //a copy is already running
        {
            //I can't currently tell the window's state,
            //so I both restore and activate it
            var handle = processes.First().MainWindowHandle;
            ShowWindow(handle, SW_RESTORE); //GRR!!!
            SetForegroundWindow(handle);
            return true;
        }

        try
        {
            //If a copy is not running, start one.
            Process.Start(@"C:\Program Files (x86)\ExternalApp\ExternalApp.exe");
            return true;
        }
        catch (Exception)
        {
            //fallback for 32-bit OSes
            Process.Start(@"C:\Program Files\ExternalApp\ExternalApp.exe");
            return true;
        }