If your goal is to play an older Call of Duty game without the original disc or to fix compatibility issues,
Paste them directly into the root folder you just opened. They should sit in the same folder as other major game files like localization.txt or main game .exe files. :
This instruction refers to a common manual installation process for a "trainer" or mod for the original or Call of Duty: United Offensive .
After moving the files, verify that they are indeed in the root COD folder:
: Usually located at C:\Program Files (x86)\Call of Duty .
to make them run on modern versions of Windows like 10 or 11.
This folder typically contains the main executable ( .exe ), game assets ( .iwd , .ff files), configuration files, and the players subfolder for save data. Modifying files here can permanently affect the game’s behavior.