I figured but it might not be a bad idea to load them into the current free version and save a new copy to make sure at some future date, they do not somehow make it so that they cannot be opened in the current version at least.  I didn't see anything specifically saying that you will not be able to open older versions but I would not risk it.  Just a thought.  

--Nathan, TX. Hire the lazy man. He may not do as much work but that's because he will find a better way.