From the extracted files, here’s what you get (roughly 340 MB total):
File: fg-optional-bonus-soundtracks.bin
Format:
- Header (4 bytes): Magic number "FGOS"
- Version (2 bytes): e.g., 0x0100
- Track count (2 bytes)
- For each track:
- Offset to audio data (4 bytes)
- Size of audio data (4 bytes)
- Flags (1 byte): 0x01 = loop, 0x02 = unlock by default
- Null-terminated title string (max 64 chars)
- Audio data section (concatenated, aligned to 16 bytes)
The Verdict: If you never use the in-game "Jukebox" mode and you are low on space, delete it. You will not break the core gameplay—no fights, no cutscenes, no online matches rely on this file.
For the modders and data miners: You cannot rename .bin to .zip and unzip it. These files are usually encrypted using CRIWARE technology (specifically the CriPak or CPK container). fg-optional-bonus-soundtracks.bin
Tools you will need:
The basic extraction process:
Warning: Encrypted games (Denuvo or custom DRM) sometimes tie the decryption key to your specific user ID. You may need to extract a keys.bin file from the game’s executable, which is advanced and not for casual users.
Yes if you:
No if you:
As game distribution evolves, the .bin container is slowly being phased out in favor of streaming assets. However, for the current generation of fighting games and Japanese RPGs, this file remains a staple. From the extracted files, here’s what you get
Publishers are realizing that players want choice. The "optional" tag is becoming more literal. In upcoming titles, you will likely see this file replaced by a "Music Pack" DLC that streams directly from the cloud, negating the need for local storage.
Until then, treat fg-optional-bonus-soundtracks.bin with respect. It is the digital soundtrack to your victories—or, depending on your hard drive space, the first thing you sacrifice to install the latest patch. The Verdict: If you never use the in-game