> My previous game settings, like "windowed mode" ignored.
That is a bug. The new version was meant to be able to read the old settings
> Not sure if any other back compatibilities broken by that old AppData
Don't worry about it, everything should be fine ;)
1.2 breaks compatibility of old games, but that does not always happen when we release a new version. When you create a new campaign, all these old game saves are deleted