[BugRoger]

Well, the problem wasn't that I couldn't get it to run. It started just fine with a double click. What I didn't get is that you have to specifiy the "path to .trn file" like this:

C:\Games\dominions2\mygame\mynation

Then I didn't know how to actually use it. It took a while until I figured that you have to load and save right before you hit "host". And you don't even have to quit the game to load an older turn. To load an older turn from within the game, hit end turn, load game, go back to game.

Maybe this is useful for somebody else.