"Crystal Peak FL.rar" is likely a compressed archive containing FL Studio project files (.flp) and associated assets for a musical remix of the "Crystal Peak" theme from Hollow Knight . Such archives typically include the project file, MIDI data, and instrument presets, allowing producers to modify or study the track within FL Studio. To use it, simply extract the file and open the .flp in your DAW. Crystal Peak | Hollow Knight Wiki | Fandom