Right-click on the specific Call of Duty title and select . Go to the Installed Files (or Local Files) tab.
The ui.ff file contains the essential data for the game's menus, HUD (Heads-Up Display), icons, and buttons. If this file is missing or corrupted, the game will fail to launch because it cannot render the interactive elements necessary for you to select a mission or change settings. How to Download and Restore ui.ff ui.ff file download
...\Call of Duty Modern Warfare\Data\data\ Right-click on the specific Call of Duty title and select
C:\Program Files (x86)\Steam\steamapps\common\Call of Duty Modern Warfare 2\zone\english\ HUD (Heads-Up Display)