| $ | Visual Basic Symbols Data |
| $$m | 3D Gamestudio Backup Map Data |
| $b | TR-DOS Basic Data |
| $dx | CA Visual Objects Index Backup |
| 1st | Visual FoxPro Documenting Wizard List |
| 1t | Fortran 1T Data |
| 2clk | Frontier for Mac Script |
| 2lang | 2LANG Data |
| 3dfbat | 3DField Script |
| 3dmlw | 3D Markup Language for Web Document |
| 3mp | TTCN-3 Source Code |
| 3xe | 3DLinX Entity Data |
| 42m | Genero BDL Compiled Module |
| 4da | 4D User Forms Data |
| 4ge | IBM Informix 4GL Compiled Code |
| 4gl | IBM Informix 4GL Source Code |
| 4ma | FileMaker Pro Runtime Database |
| 4ui | ForeUI Plot |
| a | Free Pascal Archive |
| a1 | Free Pascal Compiled Archive |
| a3c | Alan v3 Adventure Code |
| a3x | AutoIt v3 Compiled Script |
| a43 | IAR System MSP430 Target Application |
| a4e | Adobe Authorware External Library |
| a4l | Adobe Authorware Library |
| a4m | Macromedia Authorware Macintosh File |
| a4p | Macromedia Authorware Source |
| a4w | Macromedia Authorware Windows File |
| a51 | Adobe Authorware 5.1 Library |
| a51 | µVision Assembler Source Code |
| a5rpt | Alpha Five Project Report |
| a5w | Alpha Five Web Publishing File |
| a5wcmp | Alpha Five Web Publishing Component |
| a65 | Adobe Authorware 6.5 Library |
| a68 | PDP-10 Algol-68 Compiler Source Code |
| a7e | Macromedia Authorware Packaged Library |
| a86 | A86 Assembly Source Code |
| aah | Amazingly Abstracted HTML Document |
| aapkg | ArchestrA IDE Package |
| aas | Windows Application Assignment Script |
| ab | Android Debug Bridge Backup |
| ab | Applix Builder Data |
| abap | ABAP Source Code |
| abc | Adobe ActionScript Bytecode |
| abc | LithTech 3D Game Model |
| abex | Enhanced Android Backup |
| abl | ABEL Hardware Description Language Data |
| abm | Alpha Five Database Export |
| abn | Alpha Five Database Export |
| abo | Applix Builder Object |
| abs | Atari Jaguar DRI/Alcyon Format Data |
| abs | GCC ELF/DWARF Format Absolute Data |
| ac | GNU Autoconf Input File |
| accessor | Visual Studio Accessor Data |
| acl | Arbortext Command Language Data |
| acme | ACME Assembler Source Code |
| acsup | Avaya CMS Script |
| act | DS Game Maker Action Data |
| act | Visual FoxPro Documenting Wizard Action Diagram |
| actx | DS Game Maker Action Description |
| acu | ACUCOBOL-GT Compiled Program |
| acx | IBM Rational XDE ACX Data |
| acx | WebFOCUS Data Description |
| ad | AxSys Script |
| ad | DSM Application Diagram |
| ada | Ada Source Code |
| adb | Ada Implementation File |
| adb | Alpha Five Database |
| adblock | Alpha Five Database Lock |
| add | Apache Beehive Collection Data |
| addin | Visual Studio Add-in Definition |
| adi | Microsoft Dynamics AX Application Developer Documentation Index |
| adls | ADL Source File |
| adpp | Adobe Device Central Profile Package |
| ads | Ada Specification File |
| adt | Eclipse IDE Cobol Project |
| adt | IBM AIX Application Development Toolkit Data |
| advixeexp | Intel Advisor Results Data |
| advs | Adobe Device Central Device Set |
| aef | CA Visual Objects Application Export Data |
| ael | Asterisk Extension Language Source Code |
| aet | FileMaker Pro Runtime Database |
| aex | Alpha Five Compiled Library Script |
| afl | Psion OPL Add-file List |
| agc | AfterGRASP Compiled Script |
| agi | Asterisk Gateway Interface |
| agls | Adobe GoLive Snippet |
| ago | Autolog Script |
| agp | ASPMaker Project |
| agq | Altair GraphQL Client Data |
| ags | AfterGRASP Script |
| agwl | Abstract Grid Workflow Language Data |
| ahf | AnadigmDesigner ASCII Code |
| ahr | Omnis Studio Ad hoc Report |
| ahtml | Amulet Module Main OS File |
| ai | OpenEdge ABL After Image |
| aidl | Android Interface Definition Language Data |
| aif | Object COBOL Animator Session Data |
| ain | Valve Source Compiled AI Nodegraph |
| aio | APL Transfer Format File |
| aj | AspectJ Source Code |
| al11 | SAP ABAP AL11 Transaction Code |
| alan | Alan v3 Source Code |
| alb | Alpha Five Library |
| alg | PDP-10 Algol Compiler Source Code |
| all | Java RMI Policy File |
| alm | Alpha Five Data |
| alx | ActiveX Layout Control Data |
| alx | Alpha Five Script Data |
| am | Applix Builder Shelf Macro |
| am | GNU Automake Input File |
| amd | ASCET XML Model Description |
| amf | Autolog Macro |
| aml | Abstract Markup Language File |
| amn | Aero Studio 2008 Menu Data |
| amos | AMOS Source Code |
| ane | Adobe AIR Native Extension |
| ani | Valve Source Model Animation Data |
| animevents | Amazon Lumberyard Animation Events Database |
| animgraph | Amazon Lumberyard Animation Graph Data |
| animset | FaceFX Animation Set Data |
| animset_ingame | FaceFX In-Game Animation Set Data |
| anl | Project Analyzer Saved Data |
| ansym | Adobe Edge Animate Symbol Data |
| anv | Anastasia Style |
| aop | JBoss AOP File |
| ap | WebSuite Active Page |
| ap3 | VS10XX VSOS Application |
| apc | Gupta Team Developer Compiled Application |
| apd | Eclipse IDE Plugin Descriptor |
| apg | APGen Script |
| api | WebObjects API File |
| apinotes | Swift Objective-C API Note |
| apl | Gupta Team Developer Application Library |
| aplt | AppleScript Applet |
| apm | Adobe Authorware for Mac Packaged Data |
| app | dBase Application Generator Object |
| app | Gupta Team Developer Application |
| app | OrbWorks PocketC Application |
| app | Psion OVAL Application Data |
| app | Visual FoxPro Application |
| appc | Oracle WebLogic APPC Data |
| applet | Eclipse IDE Java Applet Policy Data |
| appletviewer | Java appletviewer Data |
| appodeal | Appodeal SDK Data |
| appup | Erlang Application Upgrade File |
| appx | Microsoft Windows 8 App Package |
| appxbundle | Microsoft Windows 8.1 App Bundle Package |
| appxbundlemanifest | Microsoft Windows 8.1 App Bundle Manifest File |
| appxmanifest | Windows 8 App Package Manifest Data |
| appxsym | Windows 8 App Package Symbols |
| appxupload | Visual Studio Windows Application Upload Data |
| aps | Uniface Startup Shell Data |
| aps | VS Binary Resource Script Data |
| apw | Adobe Authorware Packaged Data |
| apx | Borland C++ AppExpert Database |
| apx | WebSuite Compiled Active Page |
| aqf | Aquifer CMS Page |
| ar | Java JRE 1.3 Library |
| ar | Unix Static Library |
| arbfp1 | ARB Fragment Shader Program |
| arbvp1 | ARB Vertex Shader Program |
| arc | BASIS ASCII Resource Data |
| arcv | Crestron SIMPL Archive Manifest Data |
| armi | Carbide ARMI Project |
| armx | ASP.NET Source Code |
| arnoldc | ArnoldC Source Code |
| aro | SteelArrow Web Application |
| arq | Remedy ARS Macro |
| arsc | Android Package Resource |
| as | Adobe Flash ActionScript |
| as | AngelScript File |
| as1 | ActionScript 1.0 Source Code |
| as3 | ActionScript 3.0 Source Code |
| asa | ASP Global Script |
| asax | ASP.NET Application |
| asbx | ASP.NET BridgeHandler Data |
| asc | Adobe ActionScript Communication Script |
| ascp | Adobe Device Central Project |
| ascs | ActionScript Communication Server Script |
| ascs | Adobe Device Central Data |
| ascx | ASP.NET User Controls |
| ash | Turbo Assembler Header |
| ashx | ASP.NET HTTP Handler |
| asi | Alpha Five Variables Data |
| asi | Assembly Include File |
| asic | ASIC Source Code |
| asm | Assembly Source Code |
| asmx | ASP.NET Web Service |
| asn | Uniface Assignment Data |
| aso | ActionScript Object |
| aso | Turbo Assembler Compiled Object |
| asp | Active Server Page |
| asp+ | ASP.NET ASP+ File |
| aspr | ASProtect Related Data |
| aspx | ASP.NET Page |
| asq | AcuSQL Precompiled File |
| asr | Flash Server-side ActionScript |
| assetinfo | Amazon Lumberyard Asset Info Data |
| asv | Crestron SIMPL Program Autosave |
| asv | MATLAB AutoSave File |
| asx | Alpha Five Database Index |
| asz | AlphaControls Skin Package |
| asz | LoseThos Assembly Source Code |
| atc | ACUCOBOL-GT Thin Client Command File |
| atg | Coco/R Attributed Grammar File |
| atl | ATP Assembler Source Code |
| atn | Visual FoxPro Internet Search Wizard Data |
| atsln | Atmel Studio Solution |
| au3 | AutoIt v3 Script |
| aub | Intel GPU Simulator Input |
| aut | AutoIt Script |
| autosave | GDevelop Autosave Data |
| avm | QAvimator Document |
| avrsln | Atmel Studio Legacy Solution File |
| awk | AWK Script |
| awl | Alternative Web Language Source Code |
| awl | Siemens AWL File |
| awl | WebDev AWP Page Library |
| awp | WebDev AWP Page |
| awws | WebDev WebService Library |
| awx | Microsoft DirectX AWX Data |
| axb | Alpha Five Xbasic Script |
| axd | ASP.NET Trace Handler |
| axe | Annotated XML Example |
| axe | Paradigm C++ Integrated Debugger Data |
| axf | ARM RealView Compiler Object |
| axf | µVision Absolute and Executable Object |
| axl | ASCET Compressed Model Data |
| axml | Xamarin Android XML Layout |
| axp | AxpDataGrid Data |
| axp | GNU Arch Extension Data |
| axs | ActiveX Script |
| aya | Ayauhteotl Parser Data |
| azcli | Microsoft Azure CLI Script |
| b | BuRg3r Definition Data |
| b | Limbo Source Code |
| b | Modula-3 Base Program |
| b24 | Ovation Pro for RISC OS C Script |
| b25 | Ovation Pro for RISC OS DDL Data |
| b26 | Ovation Pro for RISC OS Style Sheet |
| b27 | Ovation Pro for RISC OS Document |
| b2d | Brutus2D Source Code |
| b32 | Borland C Compiler Data |
| b36 | PDP-10 BLISS-36 Compiler Source Code |
| babylon | Babylon.js Scene |
| bacpac | Microsoft SQL Server DAC Exported Package |
| bal | B4A Layout |
| baml | Compiled XAML |
| bar | BREW MP Binary Application Resource |