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All these files are compressed with the "gzip" program. To uncompress them in Windows, use winzip or a Windows version of g[un]zip. Also, please don't just download these for the hell of it -- they account for 95%+ of my HTTP traffic bytes.

cegtges.bin.gz created from the CEGT 2005 games -- a good "small" book
twic.bin created from "The Week In Chess" magazine PGN files.
large.bin.gz the opening book that typhoon uses on ICC
README.html was last updated 19 July 2013 and is Copyright (C) 2002-2015 by Scott Gasch (scott.gasch@gmail.com).