http://www.youtube.com/watch?v=bJisfaIiiNo this video should help you out. But basically if you have an HTML file you can open it and save it in Notepad. Let me know if this does not help you or if this is not what you are looking for.
Just save it with .html extension. If you are using Notepad for editing, then give filename.html in double qoutes such as "hi.html". If you have saved it in HTML, try to see properties of the file to confirm it.