Got it. I was confusing categories with location. Thanks.

I see ,then, that some of my books have all the files in the same folder, but that others use a folder structure like: 0EBPS/text/c01.html for some files but not all.

The bulk rename in the file browser will rename "c01". Is there a bulk utility that will change the "OEBPS/text" prefix (ie. move the files)?

*EDIT*
No need for a reply. I found a quick and dirty way to accomplish what I wanted. Thanks for the great program.