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Modding AACW
From AACWWiki
Much of the game information in AACW is available in various text files, and it is also possible to modify most of the graphics the game uses.
General guides for modding AACW
Creating a new version of the game for your mod
AGEOD patches AACW frequently. Patches are comprehensive, and will overwrite your mod. How do you avoid this?
Go to the main game directory (the one that contains AACW.exe). Create a new folder. Name it after your mod (for example - "my_mod"). Copy all the files and folders from the ACW folder into the my_mod folder. Create a text file. Name it modpath.ini. Open modpath.ini - on the first line type "my_mod" (without the quotes). Save it.
Now when the game starts it will use files in the my_mod folder. You can create and test your mod here. You can still install patches to the ACW folder. If you want to play the standard game, delete whatever you typed in modpath.ini. It is a good idea to save copies of all modified files in another location, so that you can easily create a new mod folder for each patch.