| 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 | Alphacam Laser VB Macro |
| alb | Epson Print CD Label Data |
| albw | MakeitOne Album Wrapper |
| alc | Microsoft Dynamics AX Application Label Cache |
| ald | Microsoft Dynamics AX Application Label Data |
| ald | Aldefaer v3 Data |
| aldf | Aldefaer v4 Data |
| alex | Alex Data |
| alf | Act! Database Log |
| alfa | Abbreviated Language For Authorization Data |
| alg | Bentley InRoads Survey Alignment File |
| ali | Application Loader Information |
| alm | SiRFDemo GPS Almanac File |
| alm | Alphacam Laser Param Macro |
| aln | ClustalW2 Alignment Data |
| alp | Alphacam Laser Post Data |
| alpha | Gimp RAW Alpha Data |
| alr | ADRIFT Language Resource |
