| bsdesign | Bootstrap Studio Design Project |
| bsp | BestAddress HTML Editor Project |
| bsproj | BannedStory Project |
| bt | BTwin Project |
| btproj | Microsoft BizTalk Project |
| bvp | VodaHost BlueVoda Project |
| bwl | BrainStorm Project |
| bwp | Book Writer Project |
| bwpr | PlainHTML Project |
| bxp | BasicX Project |
| c2c | CopyToDVD Project |
| c3p | Construct 3 Project |
| Core 3 Xpanel Project |
| c3prj | Core 3 Xpanel Project |
| cal | Creatacard Calendar Project |
| cam | Camtasia Studio Project |
| camerror | Camtasia Studio Error Log |
| camproj | Camtasia Studio Project |
| camthtr | Camtasia Studio Theater Project |
| cap | Code Architect Project |
| Construct Project |
| capcut | CapCut Project |
| capobundle | Capo Project Bundle |
| caproj | Scirra Construct Project |
| capx | Construct Compressed Project |
| car | Creatacard Quarter-Fold Card Project |
| caustic | Caustic Audio Project |
| cbp | CD Box Labeler Pro Project |
| Code::Blocks Project |
| cbproj | C++ Builder Project |
| ccbproj | CocosBuilder Project |
| ccproject | Character Creator Project |
| ccs | CodeCharge Studio Project |
| cd | Steinberg WaveLab Basic Audio CD Project |
| cd4 | Dymo DiscPainter Document |
| cdp | CD Architect Project |
| Steinberg WaveLab Basic CD Project |
| cdprj | CD Menu Creator Project |
| cdproj | CppDepend Project |
| cdt | ImgBurn CD-Text Project |
| cedprj | Ashampoo CoverEditor Project |
| celtx | Celtx Project |
| cenon | Cenon Project |
| cenon~ | Cenon Project Backup |
| cep | CostOS Estimating Project |
| Vector NTI Assembly Project |
| cepx | Vector NTI Assembly Project |
| cer | Creatacard Certificate Project |
| cfp | C-Free Project |
| Subtitle Workshop Custom Format Project |
| cgp | Xilinx CORE Generator System Project |
| che | CHwinEHE Project |
| chkn | IMVU Project |
| chmprj | Abee CHM Maker Project |
| chp | CodeHealer Project |
| chproj | Adobe Character Animator Project |
| cin | Calculux Indoor Project |
| cinema4d | Maxon Cinema 4D Project |
| cl | CLwin Project |
| cl4 | Easy CD Creator 4 Project |
| cl5 | Roxio Easy CD Creator 5 Project |
| clg | Collage Maker Project |
| clk | Corel R.A.V.E Project |
| clpprj | CodeLobster IDE Project |
| clw | Grade Organizer Project |
| cmmcd | Camtasia Studio MenuMaker Project |
| cmmp | Camtasia MenuMaker Project |
| cmmtpl | Camtasia MenuMaker Template |
| cmproj | Camtasia for Mac Project |
| cms | Coach Project Archive |
| cna | Catena Project |
| cnp | Bentley CONNECT Project |
| companylogo | Company Logo Designer Project |
| con | Canoco Project |
| contentproj | XNA Game Studio Game Content Project |
| converterx | SiMX TextConverter Project |
| corelproject | Corel PhotoAlbum Project |
| cp | Adobe Captivate Project |
| cpb | Comicino Studio Project |
| cpdx | Adobe Captivate Storyboard Project |
| cpf | Cognos Framework Manager Project |
| cpg | Cool Page Project |
| cpj | WinOnCD Project |
| cpmz | Miradi ConPro Exported Project |
| cpr | ConTEXT Editor Project |
| cprj | CMSIS-Build Project |
| Cypress EZ-Click Project |
| cproj | Atmel Studio AVR GCC Project |
| cproject | Eclipse CDT Project |
| cptx | Adobe Captivate 5 Project |
| cpvc | Adobe Captivate Video Composition |
| cscproj | Colasoft Capsa Project |
| csdproj | Visual Studio .NET Visual C# Smart Device Project |
| csg | CounterSketch Design Project |
| csproj | Chaoscope Project |
| Visual Studio .NET Visual C# Project |
| ct7project | CrazyTalk Project |
| ctd | Sony ClickToDvd Project |
| ctk | TeKton3D Project |
| ctp | CrazyTalk Project |
