Developer File Types - File extensions used for developer files.
| Extension | File Description | Popularity | |
| .$01 | DOS Pipe File | Rare | |
| .001 | Multimedia Fusion Backup File | Uncommon | |
| .4db | 4th Dimension Database Structure File | Average | |
| .4dd | 4th Dimension Database Data File | Average | |
| .a | Static Library | Average | |
| .a2w | Alice World | Average | |
| .ab | Applix Builder File | Average | |
| .abc | ABC Source File | Average | |
| .acd | RSLogix 5000 Program | Average | |
| .ada | Ada Source Code | Uncommon | |
| .adb | Ada Body File | Average | |
| .adb | Alpha Five Database File | Average | |
| .ads | Ada Specification File | Average | |
| .aep | Activ E-Book Project | Average | |
| .agi | Asterisk Gateway Interface File | Average | |
| .alb | Alpha Five Library | Average | |
| .am4 | AutoPlay Media Studio 4 Project File | Average | |
| .am5 | AutoPlay Media Studio 5 Project File | Average | |
| .am6 | AutoPlay Media Studio 6 Project | Average | |
| .am7 | AutoPlay Media Studio 7 Project | Average | |
| .apa | RSView Development Project Archive | Average | |
| .art | Artifacts Artifact File | Uncommon | |
| .artproj | Artifacts Project | Average | |
| .as | ActionScript File | Average | |
| .asi | Alpha Five Variable File | Average | |
| .asm | Assembly Language Source Code File | Average | |
| .au3 | AutoIt v3 Script | Average | |
| .aut | AutoIt Script File | Uncommon | |
| .b | BASIC Source File | Average | |
| .bas | BASIC Source Code File | Average | |
| .bb | Blitz Source Code File | Average | |
| .bbc | BBC BASIC Data File | Average | |
| .bcp | Borland C++ Makefile | Average | |
| .bet | BETA Source File | Average | |
| .bpg | Borland Project Group | Average | |
| .bpl | Borland Package Library | Average | |
| .bs2 | BASIC Stamp 2 Code File | Average | |
| .c | C/C++ Source Code File | Very Common | |
| .c | Lite-C Script | Average | |
| .cap | Construct Game Development File | Average | |
| .cbl | COBOL Program | Average | |
| .cc | C++ Source Code File | Average | |
| .ccn | Compressed Multimedia Fusion File | Average | |
| .cd | Visual Studio Class Diagram | Average | |
| .class | Java Class File | Common | |
| .cls | Program Class File | Average | |
| .cob | COBOL Source Code File | Average | |
| .cod | Compiled Source Code | Average | |
| .config | Configuration File | Average | |
| .cp | Captivate Source File | Average | |
| .cp | Xcode C++ Source File | Common | |
| .cpp | C++ Source Code File | Very Common | |
| .cs | C Sharp Source Code File | Common | |
| .csi | ContentServ Include File | Average | |
| .csi | EdLog Program Data File | Average | |
| .csproj | Visual Studio C# Project | Common | |
| .cst | ContentServ Template | Average | |
| .ctl | Visual Basic UserControl Object File | Average | |
| .ctp | CakePHP Template | Average | |
| .ctx | Visual Basic Control Binary File | Average | |
| .d | D Source Code File | Average | |
| .dbo | DarkBASIC Object | Average | |
| .dcp | Delphi Compiled Package | Average | |
| .dcu | Delphi Compiled Unit | Average | |
| .dec | Declaration File | Average | |
| .def | Module-Definition File | Average | |
| .def | SmartWare II Data File | Average | |
| .dev | Dev-C++ Project File | Average | |
| .dex | Dalvik Executable File | Average | |
| .df1 | Omnis Native Datafile | Average | |
| .dfm | Delphi Form | Average | |
| .dob | Visual Basic UserDocument | Average | |
| .dox | Visual Basic Binary UserDocument | Average | |
| .dpk | Delphi Package | Average | |
| .dpl | Delphi Package Library | Average | |
| .dpr | Delphi Project | Average | |
| .dsk | Borland Project Desktop File | Average | |
| .dsp | Developer Studio Project | Average | |
| .dsym | Xcode Debug Symbols File | Uncommon | |
| .dtd | Document Type Definition | Average | |
| .dylib | Mach-O Dynamic Library | Uncommon | |
| .ent | External Entity | Average | |
| .eql | Embedded SQL File | Average | |
| .ex | Euphoria Source Code | Average | |
| .f | Fortran Source Code | Average | |
| .f90 | Fortran 90 Source File | Average | |
| .fbp | wxFormBuilder Project | Average | |
| .fgl | Fifth Generation Language Source File | Average | |
| .fic | WINDEV Hyper File Database | Average | |
| .fla | Adobe Flash Animation | Average | |
| .for | Fortran 77 Source File | Average | |
| .fpa | Front Panel Encrypted Order File | Average | |
| .fpd | Front Panel Order File | Average | |
| .fpm | FPS Creator Map File | Average | |
| .fpp | Fortran Source Code | Uncommon | |
| .fpp | Front Panel Project | Average | |
| .framework | Mac OS X Application Framework | Average | |
| .frm | Visual Basic Text Form | Average | |
| .frx | Visual Basic Binary Form | Average | |
| .fsproj | FireStarter Project File | Average | |
| .ged | Game Editor Project File | Average | |
| .gem | RubyGems Package | Common | |
| .glade | Glade Project File | Uncommon | |
| .global | Global Makefile | Common | |
| .gls | GLScript Game Script | Average | |
| .gm6 | Game Maker 6 Project File | Average | |
| .gmd | Game Maker Program Code | Average | |
| .gmk | Game Maker 7 File | Average | |
| .gml | Game Maker Language File | Uncommon | |
| .gmo | GNU Machine Object File | Average | |
| .gorm | Gorm Interface Resource File | Average | |
| .gs3 | GameStarter File | Average | |
| .h | C++ or Java Header File | Common | |
| .hal | HansaWorld Application Language File | Average | |
| .has | Haskell Script | Average | |
| .hh | C++ Header File | Average | |
| .hhh | Power C Precompiled Header File | Uncommon | |
| .hpf | High Performance Fortran File | Average | |
| .hpp | C++Builder Header File | Average | |
| .hs | Haskell Script | Average | |
| .i | INTERCAL Source File | Average | |
| .idb | Visual Studio Intermediate Debug File | Average | |
| .iml | IntelliJ IDEA Module | Average | |
| .inc | Include File | Average | |
| .ipr | InstallShield Professional Project File | Average | |
| .isc | Xilinx Device Configuration File | Average | |
| .ise | InstallShield Express Project File | Average | |
| .ism | InstallShield Project File | Average | |
| .ist | InstallShield Project Template File | Average | |
| .iws | IntelliJ IDEA Web Page | Average | |
| .iwz | InstallShield Express 2 Project File | Uncommon | |
| .j | Java Source File | Average | |
| .jav | Java Source File | Average | |
| .java | Java Source Code File | Very Common | |
| .jed | Xilinx JEDEC Programming File | Average | |
| .jic | JTAG Indirect Configuration File | Average | |
| .jpd | Java Process Definition | Uncommon | |
| .jpr | JBuilder Project | Average | |
| .jpx | JBuilder Project | Average | |
| .json | JavaScript Object Notation File | Average | |
| .kb | C++ Keyboard Script | Average | |
| .kdevdlg | KDevelop Dialog Box File | Rare | |
| .kdevelop | KDevelop Project Data File | Average | |
| .kdevprj | KDevelop Project File | Average | |
| .kdmp | Windows Crash Dump File | Rare | |
| .lbi | Dreamweaver Library Item | Average | |
| .lbs | Omnis Library | Average | |
| .lds | Linux Compile Time Header File | Average | |
| .lgo | Logo Instructions File | Average | |
| .lhs | Literate Haskell Script | Average | |
| .licenses | Visual Studio Licensed Classes File | Average | |
| .licx | Visual Studio License File | Average | |
| .lis | VAX Program Listing | Average | |
| .lit | Literate Haskell Script | Average | |
| .lnt | PC-lint/FlexeLint Configuration File | Average | |
| .lproj | Localized Project Folder | Average | |
| .lrf | Microsoft Linker Response File | Rare | |
| .lsp | Lisp Program Source Code | Average | |
| .lua | Lua Source File | Average | |
| .m | Objective-C Implementation File | Average | |
| .m4 | Macro Processor Library | Average | |
| .magik | Magik Source Code File | Average | |
| .mak | Makefile | Average | |
| .md | Machine Description File | Uncommon | |
| .med | RSView Development Project | Average | |
| .mer | RSView Development Runtime File | Average | |
| .mf | Java Manifest File | Average | |
| .mfa | Multimedia Fusion Development File | Average | |
| .mk | Makefile | Average | |
| .mlb | Visual FoxPro Library | Uncommon | |
| .mo | Machine Object File | Average | |
| .mod | Fortran Module File | Average | |
| .mom | Managed Object Model | Average | |
| .mpr | FoxPro Generated Menu Program | Average | |
| .mvx | Multimedia Fusion Movement Extension | Uncommon | |
| .mxml | Flex MXML Component | Average | |
| .myapp | Visual Studio Application XML File | Average | |
| .nib | Interface Resources | Average | |
| .nxc | NXC Source Code File | Average | |
| .o | Compiled Object File | Average | |
| .oca | Custom Control Library Type File | Average | |
| .ocx | ActiveX Control | Common | |
| .omo | OMake Object File | Average | |
| .owl | OWL Source Code File | Average | |
| .p | Pascal Source Code | Average | |
| .p | Python Pickle File | Average | |
| .pas | Pascal Source File | Common | |
| .pb | PureBasic Source File | Average | |
| .pbproj | Project Builder Project | Average | |
| .pch | Precompiled Header File | Common | |
| .pdm | VB Project Information File | Average | |
| .ph | Perl Header File | Average | |
| .pl | Perl Script | Very Common | |
| .pl | Prolog Source Code File | Average | |
| .pl1 | PL/I Source Code | Average | |
| .plc | PL/B Source File | Average | |
| .ple | Messenger Plus! Live Encrypted Log File | Average | |
| .pli | PL/I Source Code File | Average | |
| .pm | Perl Module | Average | |
| .po | Portable Object | Average | |
| .pod | Perl POD File | Average | |
| .pot | Portable Object File | Average | |
| .ppl | Free Pascal Dynamic Library | Uncommon | |
| .ppu | Free Pascal Unit File | Uncommon | |
| .prg | RAPID Program File | Average | |
| .ptl | Rational Rose Petal File | Average | |
| .pwn | Pawn Source Code File | Average | |
| .py | Python Script | Common | |
| .pyd | Python Dynamic Module | Average | |
| .pym | PYM Macro Preprocessor File | Uncommon | |
| .pyw | Python GUI Source File | Average | |
| .qpr | FoxPro Generated Query Program | Average | |
| .qx | Quexal Source Code | Average | |
| .r | R Script File | Average | |
| .r | Mac OS X Resource File | Average | |
| .r | REBOL Script | Common | |
| .rb | REALbasic Project | Average | |
| .rb | Ruby Source Code | Average | |
| .rbc | Rembo-C Script | Average | |
| .rbp | REALbasic Project | Average | |
| .rc | Resource Script | Average | |
| .reb | REBOL Script File | Uncommon | |
| .res | Windows Resource File | Average | |
| .res | C++ Complied Resource File | Average | |
| .rise | RISE Editor Model File | Average | |
| .rnc | RELAX NG Compact Syntax File | Average | |
| .rsrc | Macintosh Resource File | Average | |
| .rss | Symbian Application Resource File | Average | |
| .ru | JavaSoft JRE 1.3 Library | Average | |
| .rul | InstallShield Rules | Average | |
| .s | Source Code File | Average | |
| .s19 | Motorola S19 File Record | Average | |
| .sas | SAS Program File | Average | |
| .sb | Scratch Project File | Uncommon | |
| .sc | SuperCollider Source Code File | Average | |
| .sh | Bash Shell Script | Average | |
| .sln | Visual Studio Solution File | Average | |
| .sma | AMX Mod Plugin Source File | Average | |
| .snippet | Visual Studio IntelliSense Code Snippet | Average | |
| .so | Shared Library | Average | |
| .spt | ESPL Programming File | Average | |
| .src | Source Code | Common | |
| .ssc | SourceSafe Status File | Average | |
| .sud | Super Project Analyzer File | Average | |
| .suo | Visual Studio Solution User Options File | Average | |
| .sup | Super Project Definition File | Average | |
| .swc | Flex Components Archive | Average | |
| .swd | Flash Debug File | Average | |
| .t | Turing Source Code File | Average | |
| .targets | MSBuild Targets File | Average | |
| .tcc | C++ Source Code File | Uncommon | |
| .tcl | Tcl Script | Average | |
| .tds | Turbo Debugger Symbols File | Average | |
| .tk | Tk Script | Average | |
| .tpu | Turbo Pascal Unit | Average | |
| .tpx | Turbo Pascal 7 Unit | Average | |
| .trx | Microsoft MSTest Results File | Common | |
| .tu | Turing Source File | Average | |
| .tur | Turing Program Source File | Average | |
| .ui | User Interface File | Average | |
| .vac | Oc2.316s Cakit File | Average | |
| .var | Variable Data | Uncommon | |
| .vbg | Visual Basic Project Group File | Average | |
| .vbp | Visual Basic Project File | Average | |
| .vbproj | Visual Studio Visual Basic Project | Common | |
| .vbx | Visual Basic Custom Control | Average | |
| .vbz | Visual Basic Project Template | Average | |
| .vc | Verge Code File | Average | |
| .vc4 | Visual C++ 4 File | Average | |
| .vcproj | Visual C++ Project File | Average | |
| .vcx | Visual Fox Pro Class Library | Average | |
| .vdm | VDM Specification File | Average | |
| .vdm | VEDIT Macro File | Uncommon | |
| .vdproj | Visual Studio Deployment Project File | Average | |
| .vgc | ViziGen Code Generation Template | Average | |
| .vhd | VHDL Source File | Average | |
| .vic | ViziGen Code Import Mappings File | Average | |
| .vpc | ViziGen Configuration File | Uncommon | |
| .vspscc | Visual Studio Project Source Control File | Average | |
| .vssscc | Visual Studio Solution Source Control File | Average | |
| .w | OpenEdge Architect Source Code File | Average | |
| .wdl | World Definition Language Script | Average | |
| .wsc | Windows Script Component | Average | |
| .x | Lex Source Code File | Average | |
| .xaml | XAML File | Average | |
| .xap | XACT Project | Average | |
| .xcode | Xcode Project | Average | |
| .xcodeproj | Xcode Project | Average | |
| .xib | Interface Builder File | Average | |
| .xsd | XML Schema Definition | Average | |
| .xt | Xdebug Trace File | Average | |
| .yab | Yabasic Source Code | Average | |
| .yml2 | YML Script | Rare | |
| .ymp | YaST Metapackage File | Average |
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