Just to add to Harry's note,
HTMkit is a great free download. I am new to web applications and have scarcely scratched the surface myself, but I downloaded it when I downloaded Moodle and find myself using daily. You can edit the Moodle files using Wordpad or Notepad, but HTMLkit provides a much better interace, including line numbers, colors for keywords and comments, undo capability...
I am a little surprised the Moodle install instructions don't recommend it. For me at least, it's hard to imagine setting up and maintaining my site without it.