| cdmm | ConceptDraw MINDMAP Document |
| cdmt | ConceptDraw MINDMAP Template |
| cdmz | Compressed ConceptDraw MINDMAP Document |
| cdn | Click'n Design 3D CD Label Document |
| cdo | Crescendo Music Notation |
| cdpx | ConceptDraw PROJECT XML Document |
| cdpz | ConceptDraw PROJECT Document |
| cdr3 | CorelDraw 3 for Mac Drawing |
| cdr4 | CorelDraw 4 for Mac Drawing |
| cdr5 | CorelDraw 5 for Mac Drawing |
| cdr6 | CorelDraw 6 for Mac Drawing |
| cds | ChemDraw Stationery Document |
| cdsg | DrawMusic Chord Song |
| cdsx | ConceptDraw PROJECT XML SlideShow File |
| cdt6 | CorelDraw 6 for Mac Template |
| cdtx | ConceptDraw PROJECT XML Template |
| cdw | CeledyDraw Document |
| cdw | KOMPAS 3D Drawing |
| cdx | ChemDraw Exchange Document |
| cdxml | ChemDraw XML Document |
| cdy | Cinderella Construction File |
| ce3 | Calendar Creator v3 Document |
| cedx | CardExchange 7 Card Design |
| cer | Broderbund PrintMaster Certificate |
| cg | Guitar Chord Groover Chord |
| cg3 | Cabri 3D Document |
| cgr | Catia V5 Drawing |
| ch3 | Harvard Graphics 3.0 Chart |
| ch4 | Micrografx Charisma 4.0 Presentation |
| chai | Chaimera Artwork Document |
| chait | Chaimera Artwork Document Template |
| chd | Chordastic Chord |
| che | Stitch & Sew Embroidery Design |
| chm | Compiled HTML Help |
| cho | Chord Pro Chord |