Safety
Before doing anything copy the original file.
Unlocking Factions
To unlock factions in campaign, find descr_strat (mostly in C:\Program Files (x86)\Steam\steamapps\common\Medieval II Total War\data\world\maps\campaign\imperial_campaign).
Open this file and move factions that you want to play from nonplayable and unlockable to
playable.
However sometimes this can cause problems when you try to modify the file twice.
Unlocking Factions In Historical Battles
Navigate to maps folder and enter battle folder. You will find several folders containing historical battles files. And same like before find descr_battle file and modify it the same fashion like campaign files.
Experimenting
There is a lot of things that you can do only by modifying existing files. The most interesting thing, is that you can create custom battles and modify campaign starting stats, like state ownership etc.
Source: https://steamcommunity.com/sharedfiles/filedetails/?id=729906464
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- Unit/Weapon Attributes Explained
- Early Game Venice/England: Getting Started
- M2TWEOP - Engine Overhaul Project
- A Guide to All the Units I Can Remember
- / Ancillary ( )
- On Siege Battles
- export_descr_unit.txt explained
- /Units ( )
- Medieval 2 Windows support VISTA, 7, 8, 8.1, & 10
- The Mongol Invasion: A Guide For Every Faction