| 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 |
| 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 |
| 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 |
| AppGini Saved Style Sheet |
| agsc | eXtendable Wad Editor AGSC Data |
| agsetup | Ag Leader InCommand Setup Data |
| agt | PeerAgent Typed Executable E-mail Data |
| agtemplate | Adobe Photoshop Lightroom Template |
| agtoolkit | Adobe Photoshop Lightroom Toolkit 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 |
| MOPAC Internal Chemical Modeller Output |
| aia | Adobe Illustrator Action Data |
| 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 |
| OS/2 Warp Application Information |
| SmartWare Executable Program |
| 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 |
| AutoImager List |
| aim | AIMMS ASCII Model File |
| AOL Instant Messenger Launcher |
| aiml | Artificial Intelligence Markup Language |
| aipc | Android Inter-Process Communication Data |
| aiq | AzureIQ Client Data |
| aiqb | Intel IQ-Studio Tuning Data |
| airc | NDARC Aircraft Model Data |
| airi | Adobe AIR Intermediate Data |
| ait | Digital Video Broadcasting AIT Data |
