The conversion files for a character set include:
A conversion description file, to_charset.cvt, which contains a user-readable character set mapping table for a conversion. This file is provided for your information only.
A conversion table loading file, to_charset.ctb, which is used during Sybase’s internal table-driven conversion process.
A conversion configuration file, charset_name.cfg, which contains information on how the conversion process should proceed when charset_name is the destination character set. For more information on the conversion configuration file, see “The conversion configuration file”.