The Expanded Books Project was an undertaking at The Voyager Company, during 1991, that investigated ideas on how a book could be presented on a computer screen in a way that would be both familiar and useful to regular book readers. A lot of time was spent thinking about font choice, font size, line spacing, margin notes, book marks, and so on.

The actual programming for the intial products happened over a relatively short period, between October and December 1991, with the first three book titles being released at MacWorld San Francisco, January 1992. Those first titles were The Complete Hitch Hiker's Guide to the Galaxy, The Complete Annotated Alice, and Jurassic Park.

The product range was not definitely to be called "Expanded Books". One other favored contender was "Power Books", but that idea died when Voyager were told that the about to be released notebooks from Apple were to be called PowerBooks. Hence the original project name became the product name.

Between February 1992 and August 1992, Voyager created The Expanded Books Toolkit, which allowed authors to create their own Expanded Books. Voyager themselves went on to produce over 60 books as Expanded Books, and the underlying software was also used in CD-ROMs such as A Hard Day's Night, Salt of the Earth, and Macbeth.

All programming for the Expanded Books and Toolkit was in HyperCard.