If you want to play longer than 100 turns, do as described abovein this answer, and change values in both lines to any you like, but it won't enable "play one more turn" after that. To enable the "play one more turn" button, you go to the section Game Event Handlers
, and change the following line:
PreGame.SetGameOption("GAMEOPTION_NO_EXTENDED_PLAY", true); - No extended play allowed
to false
in the end.
All done. The same applies to any other scenario file.