.MBBK File Extension
File TypeManaBook Book Kit File
What is an MBBK file?
File created by ManaBook, a Microsoft Word add-in used to combine multiple Word documents into a single "book"; contains a template, or "kit", that allows users to create new book documents that use the same page layout; used for managing many documents through a single interface.
MBBK files are used in conjunction with .MBB files for organizing ManaBook books.