I backed up medieval2.preference.cfg and then renamed it to a .TXT file. Then I could edit it. Rename it back to CFG and you should be good to go.
I turn off the green arrows and the giant throbbing banners immediately before I play any TW game. I wish I could turn off the defense tower ownership bubbles in Fall of the Samurai. I can’t stand how they float over the castles looking stupid.
I’m surprised that more people don’t turn off the big banners but most people don’t. I’m sure glad they are optional!
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