You can just edit the skybox field in the setuplevel.fpi for mygame.
Path = The Game CreatorsFPS CreatorFileslanguagebankenglishgamebankmygamesetuplevel.fpi
;AIScript from Wizard
;Header
desc = Setup Wizard
; Setup Level Stats
:state=0:sky=skybank\natural\ngt
:state=0:music=,musicvolume=50,soundscale=25
:state=0:fog=0,fogred=0,foggreen=0,fogblue=0
:state=0:ambience=15,ambiencered=255,ambiencegreen=255,ambienceblue=255
You'll have to set up your own images and folder in the skybank folder manually, though.
~Dave
Phoenix Sentry Programmer