Sometimes you can't view some files on a website because you must be registered first, how do you view those files without register? Or maybe you want to see all files inside a website. You can use one of following tags to search any website files from Google, including photos, videos, and many more.
-inurl:htm -inurl:html intitle:"index of" [
format] "[
title]"
Example:
-inurl:htm -inurl:html intitle:"index of" jpg "funny"
-inurl:htm -inurl:html intitle:"index of" midi "song"
-inurl:htm -inurl:html intitle:"index of" txt "data"
-inurl:htm -inurl:html intitle:"index of" pdf "onlinebook"
-inurl:htm -inurl:html intitle:"index of" mpeg "movie"
Have a nice try! :)