| btab | ASCII Guitar Tab |
| btd | Business-in-a-Box Document |
| btf | Basi Office TypeFace Document |
| btx | BibTeX Document |
| btxt | BTXTPad Document |
| buz | Buzz Tools BuzzEdit Document |
| bwb | Visual Baler Spreadsheet |
| bwd | BanglaWord Document |
| bwp | BuRg3r Web Page |
| bws | SmartWare Worksheet Backup |
| bxl | Accelerated Designs Binary PCB Library |
| bxu | PictureGear Studio file |
| byd | BYP Layout Document |
| bzabw | AbiWord Bzip2 Compressed Document |
| c1d | C1Report C1D Open XML Document |
| c1dx | C1Report C1D Open XML Document |
| c2w | Cybernet v2 Document |
| c3d | Chem3D Document |
| cad | Autodesk QuickCAD Document |
| BobCAD-CAM CAD Document |
| cadl | CADKEY CAD Advanced Design Language File |
| cadoc | Clicker App Document |
| cae | Caditor Encrypted Document |
| cal | Broderbund PrintMaster Calendar |
| calca | Calca Document |
| calx | Calendar Printing Assistant Template |
| cap | Capella Music Score |
| capx | Capella XML Music Score |
| capxml | Capella XML Document |
| car | Broderbund PrintMaster Card |
| NeoBook Cartoon |
| cas | Comma-Delimited ASCII Text |
| case | SlipCover Case Template |
| cat | TablEdit Chord Catalog |
| catdrawing | Catia Drawing |
| catpart | Catia V5 Part Description Document |
| catproduct | Catia V5 Product Description Document |
| catprt | Catia V5 Part Description Document |
| cax | VCollab Pro 3D Model |
| cbb | CyberBuddy Document |
| cbcx | Comic Book Creator Document |
| cbk | National Estimator Costbook |
| cbt | Computer-based Training Document |
| cbtx | Comic Book Creator Template |
| cbtz | Comic Book Creator Template |
| cbw | ComicRack WebComic Document |
| cc5 | Calendar Creator v5 Document |
| cce | Calendar Creator v2 Document |
| cch | CorelDRAW Corel Chart Document |
| ccitt | CCITT Group 3 and Group 4 Encoded Fax |
| cct | Adobe Director Compressed Cast |
| ccz | DxDesigner Compressed PCB Layout |
| cd2 | Click'n Design 3D Document |
| cdb | Pocket Access Document |
| cdc | Canvastic Drawing |
| Nero Cover Designer Import Document |
| cdd | CADAM Drawing Document |
| ConceptDraw Pro Drawing |
| Ovation 1 Document |
| cddx | Circuit Diagram Document |
| cddz | ConceptDraw PRO v10 Document |
| cdk | CADKEY Document |
| Calamus Document |
| cdl | CADKEY CAD Advanced Design Language File |
| CaseWare Working Papers Document |
| Circuit Description Language Data |
| SignLab Vector Graphics Data |
| cdml | Creately Document Markup Language Document |
| cdmm | ConceptDraw MINDMAP Document |
| cdmt | ConceptDraw MINDMAP Template |
| cdmtz | ConceptDraw Compressed MINDMAP Template |
| cdmz | Compressed ConceptDraw MINDMAP Document |
| cdn | Click'n Design 3D CD Label Document |
| cdo | CADAM Overlay Data |
| Crescendo Music Notation |
| cdoc | Clicker Document |
| cdp | ConceptDraw PROJECT Document |
| 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 |
| ConceptDraw PROJECT Slideshow |
| cdsg | DrawMusic Chord Song |
| cdsx | ConceptDraw PROJECT XML SlideShow File |
| cdt6 | CorelDraw 6 for Mac Template |
| cdtx | ConceptDraw PROJECT XML Template |
| cdw | CeledyDraw Document |
| 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 |
| cfl | CorelFlow Flowchart Document |
| cft | CorelFlow Flowchart Template |
| cg | Guitar Chord Groover Chord |
