fg-optional-4k-videos-3.bin is a component of a FitGirl Repack , typically found in high-fidelity games like Forza Horizon 5 Mortal Kombat 11 Call of Duty: WWII Review: Do You Need It? The short answer is
The installer will likely use lower-resolution videos (often 1080p or highly compressed versions) to fill the gaps, or skip those specific scenes entirely. fg-optional-4K-videos-3.bin
Use a tool like (Windows) or Hex Fiend (Mac). Open the file and look at the first 4–8 bytes (the “magic number” or file signature). fg-optional-4k-videos-3
: