CorelDRAW

CorelDRAW is a vector graphics drawing program. Its native file format is generally found in .cdr files, but other extensions exist for variants of it. The format has gone through several major revisions over the years.

Extensions

 * .cdr: Normal CorelDRAW file
 * .cdt: Template
 * .cdx: Compressed file
 * .cmx: Corel Presentation Exchange Format
 * .ccx: Clip art file (similar to .cmx in format)

Format description
Early CorelDraw files are of an undocumented proprietary format where the first two bytes spell  in ASCII. Later formats were based on RIFF, with  as the first four bytes and a version identifier in bytes 9 to 15. The inner details (the data chunk of the RIFF version) remain proprietary.

Links

 * Wikipedia: CorelDRAW
 * CMX file format info
 * sK1 program attempts to reverse-engineer CorelDRAW format