The font has nothing to do with the text that's stored in the file. It is a property of the application you use to view the file. So you will have to set the font in Notepad or Word, or whatever text editor you use to view the file.

Of course, Word has it's own method for saving fonts as part of the file, but I don't know if you can do that very easily. Notepad opens everything up with the same font (whichever was last selected by the user in Notepad).