I Need to Change the Resolution or window the game before launch, else it just shows as a blue screen and nothing else, I've experience this before with other games, and Changing Res or Windowing it to then Change Rez Always Works, so i'd like to know if there's a way to do this before launching a game on GOG

search swat 4 on pcgamingwiki it tells you there

Swat4.ini or Swat4x.ini

[WinDrv.WindowsClient]
FullscreenViewportX=800
FullscreenViewportY=600

found iti and Fixed the issue, thank you for your help