Image
What is a .cdx file?
A .cdx file is a CDX Internet Archive Index. This is an image format — a picture, drawing or graphic. Confusingly, this extension has been used by 6 different formats over the years — they're all listed below.
This extension has been used by more than one format
6 different formats have claimed .cdx over the years, so two files with the same extension aren't necessarily the same kind of thing.
- CDX Internet Archive IndexNo version recorded · fmt/869
- Cindex DocumentVersion 2 · fmt/1277
- Chemical Draw Exchange FormatNo version recorded · fmt/378
- FoxPro Compound Index FileNo version recorded · fmt/375
- CorelDraw Compressed DrawingVersion 1 · x-fmt/31
- OpenWayback CDXJ File FormatNo version recorded · fmt/1947
How to open a .cdx file
- GIMP (free) and IrfanView open a very wide range of image formats, including obsolete ones.
- XnView MP is the best bet for unusual or legacy image types.
- Your operating system's built-in viewer may work for mainstream formats.
The registry records this extension against CDX Internet Archive Index, Cindex Document, Chemical Draw Exchange Format and others, so software from that family is the most likely match.
How to convert a .cdx file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
MIME type
When a .cdx file travels over the web, servers label it with this MIME type:
chemical/x-cdxThe technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .cdx.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| CDX Internet Archive Index | — | — | fmt/869 |
| Cindex Document | 2 | — | fmt/1277 |
| Chemical Draw Exchange Format | — | chemical/x-cdx | fmt/378 |
| FoxPro Compound Index File | — | — | fmt/375 |
| CorelDraw Compressed Drawing | 1 | — | x-fmt/31 |
| OpenWayback CDXJ File Format | — | — | fmt/1947 |