What is the CCD file format?
.ccd is a plain-text descriptor file associated with the CloneCD disc-copying tool. .ccd files are typically small and not larger than a few kilobytes, and contain no raw disc sector data themselves. CloneCD is a discontinued project - its final maintainer, RedFox, ceased operations in June 2024 - but the .ccd format is still supported by many tools.
Actual image data is stored in .img files, not in .ccd files. .img files are typically accompanied by .sub files of the same base name that store subchannel data, such as additional disc information or copy-protection settings. .sub files are optional. The .ccd, .img, and .sub (if present) files are all required together to open a given image.
Internally, .ccd uses an INI-style format starting with [CloneCD] / Version=3, then [Disc], [Session], and one [Entry N] section per track - analogous to a .cue sheet paired with a .bin image.
Security & safety
RISK: MEDIUMThe .ccd text file itself is harmless ASCII. The risk is in what the disc image it describes contains: CloneCD images circulated heavily for pirated games and software, so a downloaded .ccd/.img set can carry malware in autorun executables or cracked binaries, and using copyrighted disc images may be illegal. Mount or extract into a folder and scan before running anything, and obtain images only from sources you trust. Note that the most common real-world problem is benign, not malicious: receiving only the small .ccd without the large .img, leaving nothing to open.
Format details
in a nutshell- ConceptDraw DIAGRAM document - Older ConceptDraw (CS Odessa) saved diagrams as .ccd - a binary diagram file, unrelated to disc imaging.
- TASKING / embedded compiler description file - Some toolchains used .ccd for a compiler/component description; niche and legacy.
Programs that open CCD files
Windows5 apps
UltraISO
Paid Open the .ccd image to extract files or convert to ISO/other formats. Commercial; keep as an option, free alternatives exist. 
IsoBuster
Freemium File → Open image file → select the .ccd; IsoBuster reads the .img/.sub set, lets you browse, extract files, or convert to ISO. Actively maintained. 
ImgBurn
Free Mode → Write; load the .ccd as the source image to burn the CloneCD set back to a physical CD/DVD. 
DAEMON Tools Lite
Freemium Mount the .ccd as a virtual drive (it picks up the .img/.sub automatically), then use the disc as if it were inserted.
AnyBurn
Free Open the .ccd to browse/extract the image contents or convert the set to ISO. Lightweight, free, actively maintained. 
Linux1 app
ccd2iso / bchunk
Open-source Command-line: 'ccd2iso name.img name.iso' converts a CloneCD image to ISO for mounting (works on the .img guided by the .ccd). Technical details
deep spec| Format type | Plain-text INI-style descriptor (sidecar file; contains no raw disc sector data) |
| Encoding | ASCII; key=value pairs grouped in named INI sections |
| File signature | No binary magic bytes; file begins with the text line `[CloneCD]` at offset 0 |
| Internal version | `Version=3` key in the `[CloneCD]` section, used by all modern CloneCD releases |
| INI sections | `[CloneCD]`, `[Disc]`, `[Session]`, `[Entry N]` - one `[Entry]` block per CD track |
| Track address fields | Mode, TNo, IMin, ISec, IFrame, PMin, PSec, PFrame - encodes both LBA and MSF (minute/second/frame) addressing |
| Max track entries | Up to 99 `[Entry N]` sections, matching the Red Book CD track-count limit |
| Typical file size | 1 KB - 10 KB |
| Companion files | `.img` (raw disc sectors, the large data file) and `.sub` (optional 96-byte-per-sector subchannel data) |
| MIME type | `application/octet-stream` (common default); also handled as `text/plain` |
| Compression | None - plain ASCII text, uncompressed |
| Encryption | None - copy-protection metadata is described in the file but not itself encrypted |
| Checksum / integrity | None built in; correctness depends entirely on the matching `.img` and `.sub` files |
| Developer lineage | Elaborate Bytes (original) → SlySoft → RedFox (ceased June 2024) |
| Primary platform | Windows (primary); file is plain ASCII and readable on any OS |
| Analogous format | Functions like a `.cue` sheet: describes track layout and TOC while `.img` holds raw sector data like `.bin` |
| Released | Late 1990s, with the CloneCD disc-copying utility |
| Latest version | Stable; tied to CloneCD (last release 5.3.4.0, 2016; software abandoned after RedFox ceased operations June 2024) |
CCD conversions
Community Q&A
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