Nevermind, found the opening book.
...Not that anyone would have helped me 
Shredder Classic 4 (Mac)
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I'm trying out the demo as Shredder seems like the only decent engine that runs on the Mac but I'm not overly impressed (especially as it costs £25, in comparison to Fritz which I got for just £12-15 and is great).
Am I right in thinking this Shredder program has an opening database (is it just the more expensive programs like Deep Shredder?) because I'm yet to find it. I was hoping someone that does own it could enlighten me on this as I suspect maybe the database is unavailable in the demo but is accessible in the full version.
Thanks.