Try looking here:
(where ever installed) \GalCiv2\Data\English\Campaigns
(where ever installed) \GalCiv2\DarkAvatar\Data\English\Campaigns
(where ever installed) \GalCiv2\Twilight\Data\English\Campaigns
You will find the files used in the campaigns. You can open the files with a text editor to read things, though it will most likely be in .xml code, and will contain data not releavent to the story.