Windows notepad has a nasty habit or at least used too, not sure if it still does of appending .txt to every file you save with it. So your file might be called abc.html.txt instead of the abc.html you intended to save. If you have not checked show file extensions it will look like abc.html in your explorer window but the web server will see abc.html.txt as windows by default hides extensions from you for some very bizarre reason I cannot fathom.
For HTML editing I recomend using a free HTML editor. There are thousands out there. Just hit source fore to find one.
To open this specific file open note pad, file -> open
Down where it says files of type change to all by selecting all files from the drop down menu. Then browse to where you saved the file and open it.
Remember a file with .txt as the extension will be treated differently by a web server than something with a .html extension. If your creating or editing web pages pay close attention to the extension used.
