| alpha | Gimp RAW Alpha Data |
| alr | ADRIFT Language Resource |
| alt3 | Adobe PageMaker for Mac Template |
| alt4 | Adobe PageMaker for Mac Template |
| alt5 | Adobe PageMaker for Mac Template |
| 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 |
| amaya | Amaya Data |
| amb | Alphacam 2D/3D Mill VB Macro |
| amb | AIMMS Model Base |
| amc | Race Studio 2 All Math Channels Data |
| amdt | AutoCAD Mechanical Desktop 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 |
| amipro | AMI Pro Table Structure Data |
| amiramesh | Amira 3D Mesh Data |
| amj | AceMoney Database |
| amk | AceMoney Backup File |
| aml | AutoMate Markup Language Data |
| amm | Autodesk Moldflow Model |
| amm | Alphacam 2D/3D Mill Param Macro |
