OK, so you want to be able to create a blank rtf document right clicking in an Explorer window. I have both Windows Vista and Windows XP, and neither does this. The option to create a blank Text Document is there but not a blank rtf document. And, again, what's the point? If you want to put some content in the blank rtf document, you still need to open it in WordPad. So, I see nothing whatsoever gained by being able to create a blank rtf file via the right click menu.
If you want a quick way to open WordPad, then put a shortcut to it on your Quick Launch toolbar.