Epwutil contains following utilities:

bookinfo - view a component of the book to know how to downsize it.
catdump - edit and concatenate the CD-ROM catalogue files.
squeeze - remove multi-media data(image or audio) and indexes for conditional
          or compound search from the book.

Bookinfo and squeeze can not be used for EPWING V4 and later.
See "Section 5: Restriction" in epwutil.doc.

In use of this programs, you have to check the agreement of your CD-ROM books
on making copies or modifying books for personal use.
See "Section 2: Before using epwutil" in epwutil.doc.