I need your help

[Jaelene812]

I saved a lot of music, videos, and several movies. I seemed to have saved them as htm. what can I do so I can enjoy the music, videos and watch the movies.  At the beginning it did not ask what format to save it as so I chose all files rather than the one indicated. I save this to a 16GB UBS stick. Save me please I'm not that savvy doing this I'm a senior.

Jae

[Adrianvdh]

So where do these movies and music come from, first of all?