The lights in Elias’s room flickered. His monitor grew hot. He realized then that the file wasn't "optional" because of its features; it was optional because once it was invited in, it didn't want to leave. It was looking for a host, a way to verify its existence in a network that had banned its signature years ago.
If you provide more context about where you found this file (e.g., a specific download, emulator, or error message), I can offer a more targeted technical breakdown. fg-optional-psn-services.bin
Reverse engineering efforts (from public PS3 dev wiki sources) show that the file exports several functions related to: The lights in Elias’s room flickered
“Welcome back, Elias. Your recent activity has been synchronized. See you online.” It was looking for a host, a way
fg-optional-psn-services.bin file is an optional component in FitGirl repacks that provides PlayStation Network integration, including overlay and trophy support for PC ports. This component can be safely unchecked during installation to save space if only the single-player campaign is desired, as it is primarily needed for multiplayer/Legends modes. Discussions on this topic can be found on GUIDE: How to play multiplayer GHOST OF TSUSHIMA [FITGIRL]