You will typically find fg-optional-multiplayer-build.bin in repacks of AAA titles where multiplayer is a separate component. Examples include:
Because .bin files are compressed and encrypted, they are often a point of concern for security-conscious users. In reputable repacking circles, these files are accompanied by MD5 or SHA-1 checksums. The installer typically runs a "QuickSFV" check to ensure that fg-optional-multiplayer-build.bin is not corrupted. If the binary data is altered by even a single bit, the decompression will fail, protecting the user from a broken installation or potential "data rot." Conclusion fg-optional-multiplayer-build.bin