| acsm | Adobe Content Server Manager Data |
| act | Adobe Photoshop Color Table |
| act | Alma act/cut Data |
| act | Animation Master Animation Data |
| act | DataWave SciWorks ACT Data |
| act | Genesis3D Actor Data |
| act | OptionVue Portfolio Manager Account Data |
| act | RSView Machine Edition Accound Data |
| act3d | SpinFire Reader ACT3D Data |
| actc | Actions Collection Data |
| actions | PhotoLine 4 Defaults Data |
| actm | Autodesk AutoCAD Action Macro |
| actor | Amazon Lumberyard Actor Data |
| acv | Adobe Photoshop Custom Curve |
| ac_ | CaseWare Working Papers Compressed Client File |
| ad | After Dark Screensaver |
| ad3e | Adobe Dimension for Mac Data |
| ada | ActiveDocs Opus Document |
| adb | Act! Database |
| adb | Adlib Express Server Data |
| adb | ALLDATA Database |
| adb | Alphacam Diecut VB Macro |
| adb | HP 100LX Appointment Database |
| adb | Intuit Quicken Address Book Data |
| adb | Now Contact Address Book Template |
| adc | ABBYY Lingvo Custom Dictionary Data |
| adc | Active Desktop Calendar Dataset |
| adc | ActiveDocs Opus Clipping Catalog |
| adc | Chromeleon ADC Data |
| adc | ClearSight Analyzer Data |
| add | Advantage Main Data Dictionary |
| add | BSL Weighted Addition Data |
| add | MapTek Vulcan Additional Structure Arcs Data |
| addism | Addism Data |
| adf | Act! Database File |
| adf | ASTRA Chromatography Data |
| adf | MicroSim PCBoard Photoplot Aperture Definition Data |
| adf | ReliaSoft ALTA Data |
| adg | Albatross Design Group 3D Scene |
| adh | Audible Download Helper File |
| adi | Advantage Database Server Index Data |
| adi | AutoCAD Device-Independent Binary Plotter File |
| adicht | ADInstruments LabChart Chart Data |
| adidat | ADInstruments LabChart Simple Data |
| adif | Amateur Data Interchange Format File |
| adiumhtmllog | Adium HTML Log |
| adix | XML-based ADIF File |
| adj | ADS40 Orientation Adjustment Data |
| adj | BenMAP Adjustment Factor File |
| adj | FARSITE Adjustment Factors Data |
| adj | LISCAD Adjustment Control Data |
| adjusted | PLINK Basic Multiple-testing Corrections Data |
| adl | ADONIS Exported Data |
| adl | DESQview ADL Data |
| adl | EULANDA ERP System User Dictionary |
| adl | openEHR Archetype Definition Language File |
| adl | QEMM MicroChannel Adapter Description Library |
| adm | Addict Dictionary |
| adm | Adobe Creative Suite Application Bar Data |
| adm | Advantage Database Server Memo Data |
| adm | After Dark MultiModule Screensaver |
| adm | Alphacam Diecut Param Macro |
| adm | EULANDA ERP System Dictionary Data |
| adm | Portfolio Admin-Level Access Data |
| adm | Windows Administrative Template |
| adn | Lotus 1-2-3 Add-in |
| adn | Microsoft Access Blank Project Template |
| ado | Autodesk Simulation Mechanical Displacement Results Data |
| ado | Canvas Duotone Data |
| adobebridge | Adobe Bridge URL Data |
| adobenet | Adobe Production Studio Data |
| adp | Alphacam Diecut Post Data |
| adq | Microsoft Application Compatibility Toolkit Query Data |
| adr | Adress PLUS SQL Database |
| adr | After Dark Randomizer Data |
| adr | Opera Bookmark Data |
| adr | z-Tree Address Data |
| ads | ADS40 Header Data |
| ads | Agricultural Data Interchange Syntax File |
| adsklib | Autodesk Revit Material Library Data |
| adt | ABBYY Lingvo Custom Dictionary Text |
| adt | Act! Template |
| adt | Advantage Database Server Database |
| adt | Alphacam Diecut Tool Data |
| adt | Autodesk AutoCAD Audit Log |
| adt | Casio EX-word Phrase Database |
| adt | HP NewWave Card Application Data |
| adtg | Microsoft Advanced Data TableGram Data |
| adu | Addict Custom Dictionary |
| adups | Android Update Data |
| adv | Nortek Acoustic Doppler Velocimeter Data |
| adw | Adhawin Transliteration Scheme |
| adx | ABBYY Lingvo Dictionary XML Data |
| adx | ALSee Thumbnail Data |
| adx | Lotus Approach Index Data |
| ad_pcf | Alibre Design Catalog Feature Part Data |
| ad_smp | Alibre Design Sheet Metal Parts Data |
| ad_sym | Alibre Design Symbols Data |
| ae1 | FileMaker Pro Runtime Database |
| aea | AdWords Editor Archive |
| aea | Ae Timer Alarm Data |
| aeb | Alphacam Wire EDM VB Macro |
| aec | Cinema 4D After Effects Composition |
| aec | DataCAD AEC Drawing Data |
| aecache | Adobe After Effects Cache |
| aecap | Adobe After Effects Text Template Capsule |
| aedt | ANSYS Electronics Desktop Data |
| aedtz | ANSYS Electronics Desktop Archive |
| aeg | Netmino Data |
| aeix | ARGUS Enterprise Exported Data |
| aek | Adobe After Effects Keyframe |
| aem | Alphacam Wire EDM Param Macro |
| aem | STK Azimuth-Elevation Mask |
| aen | Inventus Antum Secured Mail Encrypted Data |
| aeo | Avid MetaSync Avid Enhancement Object |
| aep | Alphacam Wire EDM Post Data |
| aepkey | Advanced Encryption Package Key |
| aero | STK Aerodynamics File |
| aes | Adobe After Effects Stabilizer Settings Data |
| aet | Adobe After Effects Template |
| aetx | Adobe After Effects XML Template |
| aeu | Autoroute Express Europe Route Data |
| aev | Notepad++ Data |
| aexpk | PGP Armored Extracted Public Key Data |
| af | Serif 3DPlus Model |
| af0 | PocketBook Bookmark Data |
| af4 | Audifit v4 Data |
| afb | Alphacam Flame VB Macro |
| afbrushes | Affinity Photo Brushes Data |
| afc | Active-HDL Drawing |
| afc | ArisFlow Flowchart Data |
| afd | ArisFlow Flowchart Diagram |
| aff | FRAMES Air Flux File |
| aff | Mozilla Firefox Dictionary Data |
| aff | NVU AFF Data |
| aff | WRAP SIMD Annual Flood Frequency Data |
| afg | Tablet Assembly Data |
| afm | Abassis Finance Manager Data |
| afm | Acoustic Filter Map File |
| afm | Advanced Forensics Format Metadata |
| afm | Alphacam Flame Param Macro |
| afm | DESQview AFM Data |
| afm | HP NewWave Cardfile Application Data |
| afmacro | Affinity Photo Macro Data |
| afo | Advanced File Organizer Catalog Data |
| afo | Altair FEKO ADAPTFEKO Frequency Results Data |
| afp | Alphacam Flame Post Data |
| afp | FileProtector Encrypted Data |
| afpk | Audfprint Audio Fingerprint Peaks Data |
| afploc | Mac OS X Finder AFP Location |
| afpp | Mac Apple Share Prep Data |
| afpt | Audfprint Audio Fingerprint Data |
| afr | Arachni Framework Report |
| afr | Pro/ENGINEER Network Animator Matrix |
| afs | Adobe Type Manager Font Set |
| afs | AktivFilter Specification Application |
| afs | STAAD Foundation Project |
| aft | Ancestry.com Family Tree Database |
| afu | NX Motion Simulation-RecurDyn Function |
| afw | iGrafx FlowCharter Workspace |
| afz | Ancestry.com Family Tree Database Backup |
| afzplug | Corel AfterShot Pro Plug-in |
| ag | Lotus Agenda Data |
| ag4 | Microsoft Access G4 Data |
| aga | ArcGIS ArcGlobe Data |
| agb | Game Boy Advance ROM Image |
| agc | Autodesk Simulation Mechanical Surface Contacts Text Data |
| agd | ActiGraph ActiLife Data |
| agd | AgileGraph Data File |
| agd2 | Adobe FreeHand 7 for Mac Data |
| agdata | Ag Leader InCommand Data |
| agdb | ANSYS DesignModeler Data |
| age | Age Encrypted Data |
| agent | Forte Agent Data |
| ageo | Dream Aquarium Fish Model |
| agf | Zemax ASCII Glass Catalog |
| agg | Autograph Graph Data |
| aggr | Adobe Captivate Aggregate Data |
| agl | Agile XML Archive |
| agl | ArgusLab Molecular Graphics Modelling Data |
| aglcomp | Adobe GoLive Component Data |
| agldei | Adobe GoLive Template Data |
| aglib | Adobe Photoshop Lightroom Library |
| aglsl | Adobe GoLive Site Locator Data |
| agprefs | Adobe Photoshop Lightroom Preferences Data |
| agr | AepGraph Data |
| ags | AGS Data File |
| ags | AppGini Saved Style Sheet |
| agsc | eXtendable Wad Editor AGSC Data |
| agsetup | Ag Leader InCommand Setup Data |
| agt | PeerAgent Typed Executable E-mail Data |
| agv | ArcGlobe Video Metadata |
| agw | Aspen Graphics Window Data |
| agx | IBM Rational Rose XDE Data |
| ah | SEED AH Seismogram Data |
| ah1 | ANSYS AQWA Hydrodynamic Database |
| ahb | AIM High Briefcase Report Data |
| ahead | SCAMP FITS Image Header |
| ahk | AutoHotkey Script |
| ahl | eMule Metadata |
| ahm | Acoustic Head Map File |
| ahn | Our Family Tree Data |
| ahp | Autodesk AutoCAD Help Data |
| ahstore | Microsoft SQL Server Property Hash Store |
| ahu | Adobe Photoshop Hue/Saturation Layer |
| ahv | Interfile 3.3 AHV File |
| ai | Advantage Data Dictionary Index |
| ai | MOPAC Internal Chemical Modeller Output |
| aia | Adobe Illustrator Action Data |
| aia | ANDI/netCDF Chromatography Data |
| aid | ACDSee Classic Thumbnail Data |
| aide | AIDE Data |
| aidf | AI BiddingCockpit 8 Specification Sheets |
| aidoc | AI Bietercockpit Document Data |
| aidocdef | AI Bietercockpit Document Definition Data |
| aidv | Analyte Interval Data File Format Data |
| aif | Intuit QuickBooks Accountants Review Copy |
| aif | OS/2 Warp Application Information |
| aif | SmartWare Executable Program |
| aif | Symbian OS Application Information |
| aiform | AI Bietercockpit Form Data |
| aii | Telerik Test Studio Test Definitions File |
| aiilist | Telerik Test Studio Test List |
| aij | Oracle Database After-Image Journal |
| ail | Advanced Installer Dictionary Data |
| ail | AutoImager List |
| aim | AIMMS ASCII Model File |
| aim | AOL Instant Messenger Launcher |
| aiml | Artificial Intelligence Markup Language |
| aipc | Android Inter-Process Communication Data |
| aiqb | Intel IQ-Studio Tuning Data |
| airc | NDARC Aircraft Model Data |
| airi | Adobe AIR Intermediate Data |
| ait | Digital Video Broadcasting AIT Data |
| aiu | MailWasher Update |
| aiv | AIVault Data |
| aix | Transformation Extender AIX Compiled Map |
| ajb | Alphacam Water Jet VB Macro |
| ajl | ARCserve Backup Journal Data |
| ajm | Alphacam Water Jet Param Macro |
| ajp | Alphacam Water Jet Post Data |
| akb | Haley Authority Knowledge Base Data |
| akf | Adobe Acrobat Key Data |
| akf | GE LEDR Radio Authorization Key Data |
| aki | AkAbak Import Script |
| akl | Akula Server License Data |
| akp | QuickZip Script |
| akr | GE LEDR Radio Serial Number Relationships Data |
| aks | AkAbak Script |
| aks | Aksharamala v2 Binary Keymap |