There are various options to hide file extensions of known file types. Turn those off (show all file extensions) and you'll get less fuss. Check under Tools/Folder Options/View tab on any open folder. Alternately, I use WinSyntax over notepad or word pad, you can get it free from download.com. It's actually a PHP code editor but it works very well for Poser files and especially Python scripts where preserving the original format of whitespace matters.