Instead of searching for risky third-party downloads, use the following official troubleshooting methods to restore the missing file safely. 1. Verify Game Integrity via Steam
: Once you've selected a UI style, download the UI.FF file. Make sure to read any installation instructions provided. call of duty modern warfare 2 ui.ff download
I notice you're looking for a ui.ff file for Call of Duty: Modern Warfare 2 (the original 2009 version). Instead of searching for risky third-party downloads, use
C:\Program Files (x86)\Call of Duty Modern Warfare\Data\data\ call of duty modern warfare 2 ui.ff download