While in an application, such as "TextEdit," use the "Help" menu located on the menu bar.
Prior to saving your completed TextEdit file as a .rtf file, or as a .htm file, use the "Format" pull-down to select "Make Plain Text" for saving. That file can easily be changed by later changing the extension - however, it can't be opened as an .rtf file unless it was originally saved as an .rtf file.
Try it. Weird, eh?
Message was edited by: myhighway