Medieval 2: Total War Discussion
Find this link [Game files]\data\world\maps\campaign\imperial_campaign\descr_strat.txt
you see the names
; Custom campaign script generated by Romans Campaign Map Editor
The underline words mean "MAY CRASH"
"Price is 4$"
I am unsure as I have not played the game yet (I own it though) but I think that the unplayable factions are from the new world and thus; why you can't use them. There is a very likely chance I am wrong though.
* Updated game trainers and cheats daily
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• One-Turn Construction
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+ 3 more options