Unfortunately your member profile doesn't tell us which NaturallySpeaking application you are using. We need to additionally know if you are using the Home Edition, Premium, or 1 of the professional versions. Although NaturallySpeaking doesn't natively include these commands, if you are using 1 of the professional versions you could create them yourself or consider obtaining a third-party command utility such as KnowBrainer 2011
which not only has these commands built-in but additionally includes the ability to create Advanced-Scripting commands along with prefab commands that you can edit so that you can say something like Open Letter Head
(with or without Microsoft Word open) or Save to Work
(as in a command that will name and save your file to a specific folder).