When you launch the game you will see a play button at the bottom of the WGT Launcher window. Hold down your control key, then click the play button. DO NOT release the control key until the WGT Golf Configuration window appears. Now release the control key and select your screen resolution setting.
What resolution is Simgolf?
I am currently playing SimGolf and appears that the game only runs in a resolution of 800x600 - I do not see an option to change screen resolution or to run the game in windowed mode.
Can you force Sid Meier's golf to run in non fullscreen?
You can try DxWnd to force the game to run in non-fullscreen. I tried this tool for a while. It ran Sid Meier's Golf in non-fullscreen.
Can you change the resolution of a game?
No - it's not possible to change the resolution the game is played at using any method in game. I wasn't able to find any alternative way to change the resolution via any resolution switchers or changing configuration files.