. Rather than leading to a standard website, this string instructs Google to look for server indexing pages that list raw files (like .mp4 or .avi ) which are otherwise not intended for public discovery. Understanding the "Dork": Anatomy of the Search
It is designed to find , which are raw server folders that haven't been hidden by a standard website interface. Why this query works:
: This is the standard title generated by web servers (like Apache) when they show a list of files in a folder instead of a finished webpage.