| alco | URL Manager Pro Data |
| ald | Aldefaer v3 Data |
| ald | Microsoft Dynamics AX Application Label 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 |
| alic | Atoll License Data |
| align | CWB Aligner Data |
| alm | Alphacam Laser Param Macro |
| alm | SiRFDemo GPS Almanac File |
| almb | Mac OS X Location Manager Module |
| aln | ClustalW2 Alignment Data |
| alp | Alphacam Laser Post Data |
| alph | Alpheus Data |
| alpha | Gimp RAW Alpha Data |
| alr | ADRIFT Language Resource |
| alth | QuickHelp for Mac Data |
| altp | QuickHelp for Windows Data |
| altv | QuickView Help Data |
| alv | Adobe Photoshop Levels Settings |
| alx | Application Loader XML |
| aly | Act! Company Layout |
| amb | AIMMS Model Base |
| amb | Alphacam 2D/3D Mill VB Macro |
| amc | Race Studio 2 All Math Channels Data |
| ame | CAPRA Seismic Hazard Data |
| ames | NASA Ames Data Exchange |
| amf | ADRIFT Module File |
| amf | L3DT Attributes Map Data |
| amg | SAMG Matrix Data |
| ami | AMI BIOS Firmware Update |
| amiglobe | Amiglobe 2001 Data |