Hey Kessy,
Didn't MGE ship with Chronicles? I don't have Chronicles (that's why I'm asking), but I could help you more if I knew everything you were trying to do. Are saying that you are unable to open the .scn file and it crashes when you try or are you saying the scenario starts and then crashes or crashes somewhere in between.
Are you using the editor included in Civ2 to make the scenario? or one of the other fine programs you find here at civfanatics or elsewhere on the web.
If you would be kind enough to start the game, go to the pull down menu, click game, then click game options and read the title bar, it should say "Civilization II <version number> <date>"
That could tell a lot. If it is MGE it will say "Civilization II 5.2.5f Multiplayer 16-November-98" or something quite similar.
Some possible causes of scenario crashes include Title.gif (size/colors), scenario text file is too large, labels.txt file error, menu.txt file error, rules.txt file error, game.txt file error, and so forth.
Is there an error box that comes up citing an error with smednet.dll or similar. Or is there an error box saying there is an address error or allocation error.
This is just off the top of my head--your error could be something simple as a scratch on the cd, but I thought I'd mention these things.
Good luck!
CivPartisan