Launch_UWP_APP_C#

public enum ActivateOptions
    {
        None = 0x00000000,  // No flags set
        DesignMode = 0x00000001,  // The application is being activated for design mode, and thus will not be able to
        // to create an immersive window. Window creation must be done by design tools which
        // load the necessary components by communicating with a designer-specified service on
        // the site chain established on the activation manager.  The splash screen normally
        // shown when an application is activated will also not appear.  Most activations
        // will not use this flag.
        NoErrorUI = 0x00000002,  // Do not show an error dialog if the app fails to activate.                                
        NoSplashScreen = 0x00000004,  // Do not show the splash screen when activating the app.
    }

    [ComImport, Guid("2e941141-7f97-4756-ba1d-9decde894a3d"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
    interface IApplicationActivationManager
    {
        // Activates the specified immersive application for the "Launch" contract, passing the provided arguments
        // string into the application.  Callers can obtain the process Id of the application instance fulfilling this contract.
        IntPtr ActivateApplication([In] String appUserModelId, [In] String arguments, [In] ActivateOptions options, [Out] out UInt32 processId);
        IntPtr ActivateForFile([In] String appUserModelId, [In] IntPtr /*IShellItemArray* */ itemArray, [In] String verb, [Out] out UInt32 processId);
        IntPtr ActivateForProtocol([In] String appUserModelId, [In] IntPtr /* IShellItemArray* */itemArray, [Out] out UInt32 processId);
    }

    [ComImport, Guid("45BA127D-10A8-46EA-8AB7-56EA9078943C")]//Application Activation Manager
    class ApplicationActivationManager : IApplicationActivationManager
    {
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)/*, PreserveSig*/]
        public extern IntPtr ActivateApplication([In] String appUserModelId, [In] String arguments, [In] ActivateOptions options, [Out] out UInt32 processId);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        public extern IntPtr ActivateForFile([In] String appUserModelId, [In] IntPtr /*IShellItemArray* */ itemArray, [In] String verb, [Out] out UInt32 processId);
        [MethodImpl(MethodImplOptions.InternalCall, MethodCodeType = MethodCodeType.Runtime)]
        public extern IntPtr ActivateForProtocol([In] String appUserModelId, [In] IntPtr /* IShellItemArray* */itemArray, [Out] out UInt32 processId);
    }


    static class Program
    {
        /// <summary>
        /// The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {

            ApplicationActivationManager appActiveManager = new ApplicationActivationManager();//Class not registered
            uint pid;
            appActiveManager.ActivateApplication("Microsoft.ApexPG_8wekyb3d8bbwe!forzamotorsportapex", null, ActivateOptions.None, out pid);

            //then check periodically if the PID still exists

        }
    }
}