| aui | ArcSoft MediaImpression UI Data |
| aul | AviUtl Language File |
| aum | Adobe Update Manager Data File |
| aup | Epocrates PDA Medical Software Data |
| aup3-shm | Audacity v3 Temporary Work Data |
| aur | Aurora Timetable Data |
| aur | AutoREALM Map |
| aus | AutoREALM Symbols |
| aut | Signwave Auto-Illustrator Data |
| aut | Xitami Webserver Password Data |
| autoreg | Mozilla Suite Auto Registration Data |
| autosave | Fusion Autosave |
| aux | LaTeX Auxiliary Data |
| aux | MegaHAL Aux Data |
| aux | MOPAC Auxiliary Results Data |
| aux | PTC Creo Auxiliary Parameter Data |
| aux | VecTor5 Auxiliary Data |
| auz | Ableton Live Authorization |
| ava | Animation Master Model |
| ava | BrainVoyager QX ANCOVA Analysis Data |
| ava3 | AVA CAD/CAM Data |
| avastlic | Avast Antivirus License Data |
| avb | AccPac Plus Macro Archive |
| avb | Microsoft Comic Chat Character |
| avc | Avid Media Composer Script |
| avc | Kaspersky Anti-virus Database |
| avd | Avery LabelPro Database |
| avdl | Apache Avro IDL Data |
| ave | BSL Average Data |
| avf | XenoView Atomic Velocities Data |
| avg | AVG Antivirus Virus Database |
| avg | BrainVoyager QX Event Related Averaging Data |
| avgdx | AVG Internet Security Diagnostics Data |
| avgf | AVG Internet Security Data |
| avglic | AVG Internet Security License Data |
| avgtheme | AVG Internet Security Theme Data |
| avgvpn | AVG Secure VPN License Data |
| avj | Avira AntiVirus Job Data |
| avl | Avira AntiVirus Status Data |
| avm | AVG Antivirus Incremental Persistent Data |
| avn | altaVENTE Notes |
| avpr | Apache Avro Protocol Data |
| avro | Avro Serialized Data |
| avrolayout | Avro Keyboard Layout Data |
| avroskin | Avro Keyboard Skin Data |
| avs | Adobe Photoshop Variations Data |
| avsc | Apache Avro Schema |
| avst | VirtualDub Template |
| avt | Marvelous Designer Avatar |
| avux | ARGUS Enterprise Exported Properties Data |
| avv | Avid Media Composer Volume Data |
| avx | Avid Media Composer Plugin |
| avz | AviSys v6 Database Backup |
| aw | Answer Wizard Index |
| aw5 | MESA Actigraphy Actigraph Database |
| awa | ActiveWords Archive |
| awb | ActiveWords WordBase Data |
| awb | Ad-Aware Backup Data |
| awbr | WriteOnline WordBar Data |
| awbs | Automated Weight and Balance System Data |
| awcav | ActiveWorlds Custom Avatar |
| awd | AWARD BIOS Firmware Update |
| awd | COREX Automatic Word and Phoneme Segmentation Data |
| awdb | Access Walker Database |
| awe | Adobe Acrobat Bookmark XML Data |
| awf | AUSKey Data |
| awg | ActiveWorlds Object Group Data |
| awh | ActiveWorlds Browser Help Data |
| awi | Audacity Wave Information Data |
| awkw | Awkwords Generated Data |
| awl | Ad-Aware Language Data |
| awm | Likno AllWebMenus Data |
| awm | RenderWare Language Pack |
| awn | Avant Window Navigator Theme Data |
| awp | ActiveWords Productivity Log |
| awr | Ad-Aware Reference Data |
| awr | Iconics AlarmWorX32 Report File |
| aws | Active-HDL Workspace Data |
| aws | ActiveWords System Data |
| aws | Alteryx Designer Allocate Workspace Data |
| aws | Autodesk AutoCAD Workspace Data |
| aws | Statgraphics AWS Data |
| awsec | AirWatch Inbox Secure Content |
| awses | Active WebCam Session Data |
| awshortcut | ActiveWords Shortcut |
| awt | AlbumWeb Data |
| awt | Likno AllWebMenus Drop-Down Menu Trees Data |
| awv | Iconics AlarmWorX32 Viewer File |
| awzip | ActiveWords Compressed Solution Data |
| ax | Opera AX Data |
| axa | Axialis Album Data |
| axd | Actrix Technical 2000 Data |
| axd | Avery LabelPro Re-index Data |
| axdt | ANSYS External Data |
| axe | Autoroute Export Data |
| axe | ChordMaster AXE Data |
| axg | Microsoft Autoroute Trip Data |
| axi | KPT Goo Picture Library |
| axis | Microsoft SSAS AXIS Data |
| axm | AXMEDIS Object |
| axp | AnvilCad CAD Model |
| axp | GraphStore eCADLite Data |
| axq | EditRocket Ada Editor Data |
| axr | AXIS Diplomat Report Data |
| axs | AXIS Data File |
| axt | Adobe Photoshop Replace Color Setup |
| axt | Microsoft Autoroute Trip Template |
| axt | ZENworks snAppShot Application ASCII Object Template |
| axtr | Microsoft Dynamics AX Task Recording Package |
| axvi | Axialis IconGenerator Icon Collection |
| axw | Analyzer StateForms Data |
| ayat | Ayat Data |
| ayc2 | CS-80V Data |
| ayt | Ayat Data |
| ayu | AY Paste Data |
| ayy | FSUTMS Binary Transit Plotting Model |
| az! | Vuze Partial Download |
| azd | Amazon Software Downloader Data |
| aze | Amaze Encrypted Data |
| azf | AirZip FileSECURE AZF File |
| azk | DMDX Output Document |
| azl | Amazon Kindle Data |
| azm | BTS Master AZM Map Data |
| azs | AirZip FileSECURE AZS File |
| azt | AutoZilla Template File |
| azz | AZZ Cardfile Database |
| b | Ashton-Tate Applause Batch |
| b | LILO Boot Loader Image |
| b | Molconn-Z Format Data |
| b00 | VMware ESXi Boot Information |
| b04 | NRG Symphonie RAW Data |
| b1 | VTrain Data File |
| b1j | BookJones Data |
| b1s | BookSmith Data |
| b2a | Btoa Encoded File |
| b2f | RISC OS Windows Metafile |
| b2g | Leica BLK2GO Data |
| b3d | Blitz3D Object |
| b3d | BodyPaint 3D Format Data |
| b3dm | Cesium Batched 3D Tiles Data |
| b4a | Native Instruments B4 II Data |
| b4p | Native Instruments B4 II Presets Data |
| b5 | MDBG Chinese-English Dictionary Data |
| b5l | BlindWrite 5 License Data |
| b64 | Base64 Encoded Data |
| b6l | BlindWrite License Data |
| b8 | Cubicomp PictureMaker Blue Channel Image Data |
| b83 | TI-83 Calculator Bundle Image |
| b84 | TI-84 Plus CE Bundle Image |
| ba1 | Windows Media Center Report Log |
| ba6 | TaxACT 2016 Tax Return Backup Data |
| ba6 | Vector NTI BLAST Archive |
| ba7 | TaxACT 2017 Tax Return Backup Data |
| ba8 | TaxACT 2018 Tax Return Backup Data |
| ba9 | TaxACT 2019 Tax Return Backup Data |
| bab | Babble Data |
| babl | DeBabelizer Pro Data |
| bac | Avantrix Backup Plus Backup Data |
| back | RMCProfile Coefficient Data |
| backpack | Mammoet Backpack Word List |
| backup | Ad-Aware Backup Data |
| backup | Navicat for MySQL Backup Data |
| backup | pgAdmin Database Backup |
| backupdb | Time Machine Backup Folder |
| bad | Brutus Application Definition |
| bad | DataFlex Bad File |
| bad | Microsoft Exchange Non-Delivery Report Message |
| bada | Bada Data |
| badongo | Badongo File Info |
| baf | Pioneer DJS Interface Data |
| bafl | BurnAware File List |
| bag | PMMail Mail Index |
| baggage | InstallAware Setup Dialog Baggage |
| bai | Bank Administration Institute Data File |
| bai2 | Bank Administration Institute Version 2 Data |
| bak | AcqURL Bookmark Database Backup |
| bak | BSL Background Subtraction Data |
| bak | Cast Soft wysiwyg Backup Data |
| bak | Corel WordPerfect Document Backup |
| bak | Finale Backup Data |
| bak | Grade Organizer Backup |
| bak | Microsoft SQL Server Database Backup |
| bak | MobileTrans Backup Data |
| bak | MRDS Database Backup |
| bak | TBK Tracker Deleted Course INI |
| bak | TED5 Backup |
| bak | Visual UML Model Backup |
| bak | VoCATS Modified Test Backup |
| baka | eXtendable Wad Editor BAKA Data |
| bam | SpliceV BAM Data |
| ban | MegaHAL Banned Words List |
| ban | Sierra Print Artist Banner |
| bap | Blaze Audio Wave Information |
| bap | Visage Mpeg-4 ASCII Body Animation Parameters File |
| baroc | IBM Tivoli Enterprise Console Adapter Description |
| bartco | Bartco VMS Message Data |
| bas | ALEID2000 Basic Data |
| bas | MODFLOW Basic Package |
| base | BioArray Software Environment Data |
| bash_history | Bash History Data |
| basin | HEC-HMS Basin Model Settings |
| bass | Tekla Structures Bolt Assembly Data |
| battle | Robocode Battle Data |
| bav | The Bat! Anti-Virus Plugin |
| baw | BrainLED AlfaWave Session |
| baz | Acomba Accounting Suite Backup Data |
| bb | DVIPDFM Output Data |
| bb | Papyrus Database Backup |
| bbd | Xilinx Black Box Definition |
| bbfw | iTunes Firmware Update |
| bbg | CyberSports for Basketball Game Data |
| bbi | LinkOne Publisher Book Data |
| bbj | BuilderUI Batch Job |
| bbk | Sage Fixed Assets Database Backup |
| bbk | Treepad Database Blob Backup |
| bbli | E-Sword Bible Module |
| bblx | E-Sword Bible Data |
| bbma | BonziBuddy Data |
| bbox | Geomview Simple Bounding Box Data |
| bbp | Geomview Bezier Bicubic Patches Data |
| bbq | BitBeamer Transfer Queue Data |
| bbt | BTwin Database |
| bbt | CyberSports for Basketball Team Data |
| bbv | PPLive Cache File |
| bbw | Band-in-a-Box Interface |
| bbx | BrainBox Neural Net Data |
| bbz | BerryBuzz Backup Data |
| bc | Sierra Print Artist Business Card |
| bc! | BitComet File |
| bc2 | Blue Kenue Boundary Conditions Data |
| bc3 | FIEBDC Database |
| bc6 | Cashflow Manager 2006 Backup |
| bc7 | Cashflow Manager v7 Backup File |
| bc8 | Cashflow Manager v8 Backup File |
| bc9 | Cashflow Manager v9 Backup |
| bca | Allplan Catalog Backup |
| bcd | ARM RealView Board/Chip Definition File |
| bcd | Digital Library Data |
| bcf | Adobe PageMaker Color Library |
| bcf | Belarc Advisor Content Data |
| bcf | BIM Collaboration Format Data |
| bcf | Binary Counterpart Data |
| bcf | MODFLOW Block-Centered Flow Package |
| bcg | BusinessCards MX Gradients Data |
| bch | dBASE Batch Process Object |
| bch | Eclipse IDE Commands Data |
| bch | Entrypoint 90 Batch Data |
| bch | MEADEP Query Data |
| bch | Oracle Documaker Batch |
| bch | OS/2 Warp CID Batch |