When you install "For King or Country" most of the files are placed into its own sub folder
For King or Country. However, there are several files also installed into the root
Medieval II Total War folder. One of those is
for_king_or_country.bat, which is the one that you need to right-click on and
Send To your Desktop. Once there you can use it to launch the
FKoC mod.
When you double click on the icon to start the game what it actually does is call up and launch another file that the mod installs ,
for_king_or_country.cfg, which has all the setup info for it. There is even an icon file in the your
Medieval II Total War folder that you can use to make the
for_king_or_country.bat on your desktop look prettier.
I hope that helps, good luck.