Listen to WindowOpenedEvent using UI automation in PowerShell with inline C#

WatchWindowOpened.ps1

# Windows PowerShell (5.1) script
# Watch top-level window creation and log window name, process ID and process name.

Add-Type -ReferencedAssemblies UIAutomationClient, UIAutomationTypes -TypeDef @'
using System;
using System.Windows.Automation;

public class WindowWatcher
{
	public static void Watch()
	{
		Automation.AddAutomationEventHandler(
			WindowPattern.WindowOpenedEvent,
			AutomationElement.RootElement,
			TreeScope.Children,
			(sender, e) => {
				var element = sender as AutomationElement;
				var process = System.Diagnostics.Process.GetProcessById( element.Current.ProcessId );
				Console.WriteLine(String.Format("Window Title: {0}, ProcessId: {1}, ProcessName: {2}", element.Current.Name, element.Current.ProcessId, process.ProcessName ));
			});

		Console.ReadLine();
		Automation.RemoveAllEventHandlers();
	}
}
'@

[WindowWatcher]::Watch()