A .ccd file is a text

Text file

A text file is a kind of computer file that is structured as a sequence of lines of electronic text. A text file exists within a computer file system...

 descriptor

Descriptor

Descriptor may refer to*file descriptor, an abstract key for accessing a file*index term, also known as a "descriptor" in information retrieval*molecular descriptor, which helps characterize a chemical compound...

 used by CloneCD

CloneCD

CloneCD is proprietary optical disc authoring software that makes exact, 1:1 copies of music and data CDs and DVDs, regardless of any Digital Rights Management restrictions. It was originally written by Oliver Kastl and offered by Swiss company Elaborate Bytes, but due to changes in European...

 to mark the properties of a CD/DVD image

Disk image

A disk image is a single file or storage device containing the complete contents and structure representing a data storage medium or device, such as a hard drive, tape drive, floppy disk, CD/DVD/BD, or USB flash drive, although an image of an optical disc may be referred to as an optical disc image...

. These file need to be combined with an image file (usually with .img extension) to be burned. It may also come with a subchannel file (usually .sub).

The .ccd extension can be used directly by first-party disc emulator

Virtual drive

A virtual drive in computing is a device that to the operating system appears to be an ordinary physical disk drive, with disc images substituted for disc reading hardware through the use of software called a disk emulator...

 Virtual CloneDrive. It can also be mounted with third-party virtual drives such as Daemon Tools

Daemon Tools

Daemon Tools is a disk image emulator and optical disc authoring program for Microsoft Windows. Daemon Tools was originally a furtherance in the development of another program, Generic SafeDisc emulator, and incorporated all of its features. The program claims to be able to defeat most copy...

 and Alcohol 120%.

The command line Linux application ccd2iso is available to convert ISO9660-compliant ccd/img to an ISO image

ISO image

An ISO image is an archive file of an optical disc, composed of the data contents of every written sector of an optical disc, including the optical disc file system...

.