This is not exactly same, but similar in some ways to IBM's S/38, OS/400 or whatever they call it now... In this OS (and last I touched it was 15 years ago, so things may have changed) there were no "files" - everything was a database table, and that was the only way you could store anything and it was how you for the most part interoperated with the system, i.e. the OS was essentially a relational DB. http://en.wikipedia.org/wiki/IBM_i
