"fgoptionalbonussoundtracksbin" sounds like a specific file path or a compressed archive name often found in "repack" installers for video games (where "FG" typically refers to FitGirl Repacks).
In many modern games, optional audio content is packaged into .bin or .bundle files to save space on the user's hard drive. fgoptionalbonussoundtracksbin
The file name can be broken down into four distinct components that explain its exact function: fgoptionalbonussoundtracksbin