.QXB File Extension
File TypeQuarkXPress Book File
What is a QXB file?
Digital book file created by QuarkXPress, a professional page layout and publishing application; contains the pages of a book, including a master page, book sections, page text and numbering, and page formatting; can be a completed book or a part of a larger book.
Since large books with many pages can slow down system performance, users often break up books into smaller QXB files.