This tool allows you to window the game:

1. Download the zip below

2. Unzip

3. Open D3Dwindower.exe

4. Click on the + icon

5. Go to game folder and select the main.exe (this is the game)

6. Click on the cog icon

7. Put your settings to this to the below screenshot

8. Click OK

9. Close D3Dwindower

10. Open D3dwindower

11. Double click main to launch game