CBC file is a Comic Book Collection (.cbc file). A .cbc file is a ZIP file that contains other CBZ or CBR files. In addition the .cbc file must contain a simple text file called comics.txt, encoded in UTF-8.
This format is supported by Calibre and primarily used to convert a collection of comic books to some other format.
This extension is also used by the ChessBase database program.
 The text file
The comics.txt file must contain the list of file names followed by a colon and then the title of the comic. Sample:
one.cbz:Chapter One two.cbz:Chapter Two three.cbz:Chapter Three