| 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 |
| chart | MacStitch Design Document |
| chd | Chordastic Chord |
| che | Stitch & Sew Embroidery Design |
| chi | ChiWriter Document |
| chm | Compiled HTML Help |
| cho | Chord Pro Chord |
| chopro | Chord Pro Chord |
| chord | Guitar Chord File |
| chp | BizInt Smart Charts for Patents Document |
| Corel Ventura Chapter |
| chrt | KDE KChart Document |
| cht | BizInt Smart Charts for Drug Pipelines Document |
| Chemtool Document |
| chtml | Compact HTML Document |
| cida | xplorer2 Scrap Document |
| cidf | Creative ID Document |
| cil | Microsoft ClipArt Gallery Download Package |
| cim | CimPack Design Drawing |
| cip | InPrint 2 Document |
| circuit | KTechlab Circuit Design |
| cit | BibExcel Cited Document |
| ckd | CADKEY Design Document |
| Kubotek KeyCreator Design Container |
| ckt | CADKEY Template Document |
| CircuitMaker Document |
| cl2doc | Comic Life 2 Document |
| cl2lyt | Comic Life 2 Layout |
| cl2tpl | Comic Life 2 Document Template |
| cl3 | Easy CD Creator 3 Cover Layout |
| clarify | Clarify Document |
| clb | cdrLabel Label Document |
| clgx | Collage Maker Collage |
| clkb | Clicker Books |
| clkbd | Clicker Board Set |
| clkd | Clicker Docs |
| clkt | Clicker Template |
| clkw | Clicker Word Bank |
| clkx | Clicker Grid Set |
| cln | scanGogh I Scan Document |
| cmdx | Clinical Map Document Based on XML |
| CrystalMaker X Document |
| cmk | CardShop Plus Document |
| cml | PADGen Company Info |
| cmp | Chord Pro Chord |
| HotDocs Component File |
| Label Designer Plus Document |
| Solid Edge Wire Harness Design |
| cmp_xml | Solid Edge Wire Harness Design XML |
| cmx | Corel Presentations Exchange Document |
| cnd | ControlDraw Diagram |
| cndx | Avery DesignPro for Mac Document |
| cnote | CollaNote Note Document |
| cnt | Windows Help Content |
| co | Cult3D Object |
| coa | Caligari TrueSpace COA Object |
| cob | Caligari TrueSpace Object |
| coc | BibExcel Co-occurrence Document |
| cod | Atlantis Word Processor Encrypted Document |
| col | HTML Help Collection |
| Microsoft Multiplan Spreadsheet |
| comic | Comic Life v1.2 Document |
| comicdoc | Comic Life v1.3 Document |
| comiclife | Comic Life Document |
| comictpl | Comic Life 2 Template |
| comp | Fusion Composition |
| compressed | WordCompress Compacted Web Data |
| con | Solid Edge Wire Harness Design |
| contour | Contour Screenplay Document |
| cov | Fax Cover Page |
| cp2 | Compel v2 Presentation |
| cpd | Corel PrintOffice Drawing Document |
| cpdt | Adobe Captivate Design Template |
| cpe | Microsoft Fax Cover Page File |
| cph | Corel Print House Document |
| cpi | Sietronics XRD Scan Document |
| cpo | Corel Print House Document |
| cpp | CA-Cricket Presents Presentation |
| cpr | Corel Presents Presentation |
| cpt | CA-Cricket Presents Template |
| Pocket Slides Presentation |
| cpx | Corel ArtShow 5 Document |
| cpy | eCopy Document |
| cqp | CompuQuilter Pattern |
| crb | BigOven Core Recipe Box |
| crd | Guitar Chord File |
| crf | CHARTrunner Chart Document |
| crm | CHARTrunner Multi Chart Document |
| crtr | MultiAd Creator Pro Document |
| crv | VCarve Pro Design |
| crv3d | Vectric Aspire Document |
| crw | CADrail Drawing |
| cs | Caditor Document |
| csd | CHI Storage Designer Document |
| Compact Shared Document |
