Play as 32 Factions in custom battles addon - Empire: Total War

1. Download the file
2. Extract the downloaded file to your desktop (for example)
3. Put the extracted "32_factions_in_custom_battles.pack" file in, if on a XP computer, the C:\Program Files\Steam\steamapps\common\empire total war\data folder (or wherever you have ETW installed)
4. Then enable the little mod by either:
a) Open or create the "user.empire_script" text file in the C:\Documents and Settings\[Your Account On the Computer]\Application Data\The Creative Assembly\Empire\scripts folder (visible only if the setting for showing hidden folders and files on your computer is enabled), and write...
mod "32_factions_in_custom_battles.pack";
if you dont have user.empire.script copy the one in the archive
if you want to use colonies type this in user.empire.script mod 32_factions_in_custom_battles_colonies.pack
same fore the other 4

All credit goes to Demokritos