: Sometimes, security software like Windows Defender may quarantine these files, causing installation errors. Adding the folder to your exclusions can resolve this.

When a game is built on Unreal Engine, the engine's content management system might create folders like FGOptionalUnusedVideosBin to store video assets that are not immediately needed. This allows the game to access the required content quickly, while also keeping the main game package size manageable.

You do not need this file for the game to launch or for the story to be playable . It is purely "optional."

is likely a proprietary term specific to your internal software, game mod, or asset pipeline. Based on its linguistic components, it can be interpreted as:

: You can skip downloading this file entirely if you are short on disk space or have a slow internet connection. The game will still launch and play perfectly fine using standard-resolution videos.