| ags | AGS Data File |
| agsc | XWE Data |
| agt | PeerAgent Typed Executable E-mail Data |
| ah | SEED AH Seismogram Data |
| 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 |
| aia | ANDI/netCDF Chromatography Data |
| aidf | AI BiddingCockpit 8 Specification Sheets |
| aii | Telerik Test Studio Test Definitions File |
| aiilist | Telerik Test Studio Test List |
| aij | Oracle Database After-Image Journal |
| ail | AutoImager List |
| aim | AIMMS ASCII Model File |
| aiml | Artificial Intelligence Markup Language |
| aipc | Android Inter-Process Communication Data |
| aiqb | Intel IQ-Studio Tuning Data |
| airc | NDARC Aircraft Model Data |
| aiv | AIVault Data |
| ajb | Alphacam Water Jet VB Macro |
| ajl | ARCserve Backup Journal Data |
| ajm | Alphacam Water Jet Param Macro |
| ajp | Alphacam Water Jet Post Data |
| aki | AkAbak Import Script |
| aks | AkAbak Script |
| akw | Adobe RoboHelp Help A-Keywords Index |
| al3 | Acord AL3 Data |
| alax | Quest III A La Carte File |
| alb | Epson Print CD Label Data |
| alb | Alphacam Laser VB Macro |