Crucially, it shares (textures, sounds, maps) with the main build via symbolic linking. This keeps the download size reasonable (~180 MB extra, not a full 50 GB duplicate).
If you have the exact game or tool that produces this file, additional context may refine the analysis. Consider checking the accompanying .exe or .pdb symbols for references to this filename. fg-optional-multiplayer-build.bin
: It holds the files necessary for the multiplayer portion of the repackaged game. Crucially, it shares (textures, sounds, maps) with the