The "fg" in the filename stands for , the pseudonym of one of the internet’s most famous "repackers." Repacks are versions of video games that have been heavily compressed to make downloading easier for those with slow internet or data caps.
If you have downloaded along with your game, you don't typically "open" it like a folder. Instead:
When you launch the installer, it will automatically detect the file.
If you have already installed the game and don't care about having the music files separate from the game's actual audio, you can safely delete the file to save space. However, if you haven't installed the game yet and want the bonus music, keep it until the installation is complete. Common Issues: "MD5 Mismatch"
