RB (Rocket Edition eBook File) - This format of electronic book was used in the end of 1990’s widely spread Reader Rocket eBook. Format was developed by Nuvo Media organization. You can still find editions of books in RB format on some online stores.
.rb (Rocket Edition eBook File) - is a digital box (container) with HTML content and Metadata files with expanded information. RB format is associated with Book Designer, RB2 Project, and GEB Librarian applications.