Outdated drivers, failing hard drive sectors, or overzealous antivirus software may block the game from accessing the file. Strategies for Resolution
The file is a "FastFile" data asset used by the Call of Duty game engine (primarily in Modern Warfare and Black Ops titles) to store User Interface elements like menus, icons, and buttons. ui.ff file download
If you need to check if the file exists, it is usually located in a path similar to: Outdated drivers, failing hard drive sectors, or overzealous
Because ui.ff is just a text file, you do not actually need to download it from anyone. You can generate a clean version. You can generate a clean version
const request = protocol.get(fileUrl, (response) => { // Handle redirects (3xx status codes) if (response.statusCode >= 300 && response.statusCode < 400 && response.headers.location) // Close current stream and follow redirect recursively fileStream.close(); return resolve(downloadFile(response.headers.location, destPath, onProgress));
Go to the game's installation folder (e.g., Call of Duty Modern Warfare\Data\data\ ). Delete all files ending in (e.g., 0000000001.idx ). Run the Scan and Repair tool again in the Battle.net app. Summary of common ui.ff locations Typical File Path MW 2019 .../Call of Duty Modern Warfare/Data/data/ MW2 (2009)