I'm not familiar with the opf files. As an example, first book I tried wont go back past page 3, there's no mention of spine or linear in the OPF file, beginning of the file has:
Quote:
<?xml version='1.0' encoding='utf-8'?>
<package xmlns="http://www.idpf.org/2007/opf" unique-identifier="uuid_id" version="2.0">
<metadata xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns pf="http://www.idpf.org/2007/opf">
<dc:identifier opf:scheme="calibre" id="calibre_id">2030</dc:identifier>
<dc:identifier opf:scheme="uuid" id="uuid_id">08810761-db4e-4d7a-b7c8-7ca6de171eb0</dc:identifier>
<dc:title>The Art of Dreaming</dc:title>
<dc:creator opf:file-as="Castaneda, Carlos" opf:role="aut">Carlos Castaneda</dc:creator>
<dc:contributor opf:file-as="calibre" opf:role="bkp">calibre (1.33.0) [http://calibre-ebook.com]</dc:contributor>
<dc:date>1994-05-18T23:00:00+00:00</dc:date>
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