I have been trying to install new ships. I have been able to get the Cheyenne class playable in the single player by replacing the Intrepid, but now there are no enemy ships in the missions. And the game will crash if I try and go to the skirmish menu. Does anyone know how to fix this?
there is a ship instlation guide on sfc3files.com
This usually means that you inserted the files wrong. Namely, I think that because you replaced the Intrepid with the Cheyenne, you essentially confused the game enough to crash on you. You'll prolly need to insert the Cheyenne into its own line in the game files, instead of replacing something.