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All the "information" about the book is in the file with the "opf" extension, Alex. This defines what files make up the book, what order they appear in, and so on. It's just a text file - you can open and edit it with any text editor.
The reason that some files are long and some short is that one often has one file per chapter, and the chapters of a book are not all the same length.
You can rename the files however you like - provided that you make the corresponding changes in the opf file.
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