I can write a full article about fg-optional-multiplayer-build.bin — but I need to know which context you mean. Possible interpretations include:
The installer is trying to read a large file and your system is low on RAM or virtual memory. Solution: fg-optional-multiplayer-build.bin
You do not need this file to play the main story or campaign. LAN / Co-op Optional: This tag indicates that the data contained
If you launch the standard build, the multiplayer menu options simply aren't there. No crashes, no errors—just a clean single-player experience. Conclusion You do not need this file to
The FitGirl method is widely considered the most user-friendly because it saves bandwidth for players who do not need online content.