Index.of Games Exe How To Make An "index Of" Web Page?

How to make an "index of" web page? - index.of games exe

I already have a website, so I wondered how an "index" page that contains a list of files, ... Here are some sample pages of what I speak:
http://elegans.imbb.forth.gr/games/
http://vgo-event.com/downloads/maps/285maps/