CCX (Corel)
From Just Solve the File Format Problem
Corel CCX is a vector graphics file format, used for example in the Corel Gallery 1 Million clip art collection. It is a compressed form of CMX (Corel Presentation Exchange).
See also Corel Gallery.
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Disambiguation
Some format lists say there is a CPX/.cpx format, described as "CMX compressed", but evidence is lacking.
Corel says[1] that the Corel ArtShow 5 book+CD product used a CPX format. More research may be needed here.
Format details
CCX is based on RIFF, with some of the RIFF structure compressed inside a special "pack" chunk. It (usually?) uses zlib compression.
Identification
CMX files start with "RIFF", and have "CDRX" at offset 8.
