How do i make the background of my Window Transparent with the WIndows API

[unity_832F3CE2745DA9EAED5C]

I want the background to be fully transparent and allow the UI elements to show the Window behind or things. For now this is what i have.

Unity Version: 6.1

The DXCI Swapchain is Disabled

When i build and start it there are my GameObjects and UI Elements Visible, it is Clickable and it interacts with the things behind but the Background is Black

using System;
using System.Runtime.InteropServices;
using UnityEngine;
using UnityEngine.EventSystems;

public class TransparentWindow : MonoBehaviour
{
    [DllImport("user32.dll")]
    static extern IntPtr GetActiveWindow();

    [DllImport("user32.dll")]
    static extern int SetWindowLong(IntPtr hWnd, int nIndex, int dwNewLong);

    [DllImport("user32.dll", SetLastError = true)]
    static extern bool SetWindowPos(IntPtr hWnd, IntPtr hWndInsertAfter, int X, int Y, int cx, int cy, uint uFlags);

    private struct MARGINS
    {
        public int cxLeftWidth;
        public int cxRightWidth;
        public int cyTopHeight;
        public int cyBottomHeight;
    }

    [DllImport("Dwapi.dll")]
    private static extern uint DwmExtendFrameIntoClientArea(IntPtr hWnd, ref MARGINS margins);

    const int GWL_EXSTYLE = -20;
    const int WS_EX_LAYERED = 0x00080000;
    const int WS_EX_TRANSPARENT = 0x00000020;

    IntPtr hWnd;

    void Start()
    {
        #if !UNITY_EDITOR
        hWnd = GetActiveWindow();
        MARGINS margins = new MARGINS{ cxLeftWidth = -1 };

        DwmExtendFrameIntoClientArea(hWnd, ref margins);

        SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_LAYERED | WS_EX_TRANSPARENT);

        SetWindowPos(hWnd, (IntPtr)(-1), 0, 0, 0, 0, 0);
        #endif
    }

    void SetClickTrough(bool clicktrough)
    {
        #if !UNITY_EDITOR
        if (clicktrough)
        {
            SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_LAYERED | WS_EX_TRANSPARENT);
        }
        else
        {
            SetWindowLong(hWnd, GWL_EXSTYLE, WS_EX_LAYERED);
        }
        #endif
    }

    void Update()
    {
        bool over3DObject = Physics.Raycast(Camera.main.ScreenPointToRay(Input.mousePosition), out _);
        bool overUI = EventSystem.current.IsPointerOverGameObject();

        SetClickTrough(!(over3DObject || overUI));
    }
}