.CTB

.CTB file extension

This is the basic program to work with .CTB extension

ChessBase Light 2007

ChessBase Light 2007 ChessBase openings book

.CTB extension is also supported by the following programs:

ChessBase 9

ChessBase 9 ChessBase openings book

ChessBase

ChessBase ChessBase openings book

ChessBase 13 is a personal, stand-alone chess database.
ChessBase Reader

ChessBase Reader ChessBase openings book

Open chess games database files and play through the games.