.CTG file extension
This is the basic program to work with .CTG extension
The program works with the following extensions: ck1
.CTG extension is also supported by the following programs:
ChessBase openings book
ChessBase 13 is a personal, stand-alone chess database.
WhereIsIt? Catalog Group File
Organize the contents you keep in different storage media.
GWhere allows you to manage a catalog of your CDs and any other removable media.
Open chess games database files and play through the games.