Depending on your computer settings, you will not always see the file type endings on the file names (such as .txt and .ini) in your War of 1812 module. Here are the directions for switching back and forth between late and early war uniform sets and troop lists without them:

After initial download the War of 1812 module will automatically be in a late war configuration.
(Provided you followed the entire install instructions, for Workshop users, you should have the mod's folder renamed as War of 1812 and located in \Modules.)

Open the War of 1812 folder located at the path C:\Program Files (x86)\Steam\SteamApps\common\MountBlade Warband\Modules\War of 1812

*It is recommended to put a shortcut to the path of the War of 1812 module folder on your desktop for easy access later.

Use the file renaming sequence below to change to the early war configuration:
(Late to Early)
Rename module file to module_late
Rename module_early file to module
Rename troops file to troops_late
Rename troops_early file to troops

Your module is now in early war configuration.
Start the module and it will now load the early war resources and troops menus.

To switch back to late war configuration reverse the process using the following file renaming sequence:
(Early to Late)
Rename module file to module_early
Rename module_late file to module
Rename troops file to troops_early
Rename troops_late file to troops

Enjoy