Given that the "subjects" folder contained additional text files, and "binaural" suggests a specific sort of audio file and is a hidden subfolder in a folder of audio files, it seems likely that he kept his locked files sorted by type like the rest of his files. I suspect that within the "binaural" folder you'll find additional sound files, and within the "inductions" folder you'll find additional video files.
no subject
Given that the "subjects" folder contained additional text files, and "binaural" suggests a specific sort of audio file and is a hidden subfolder in a folder of audio files, it seems likely that he kept his locked files sorted by type like the rest of his files. I suspect that within the "binaural" folder you'll find additional sound files, and within the "inductions" folder you'll find additional video files.