| amo | AIM Module |
| amodel | ActiveModeler Avantage Model |
| amp | Alphacam 2D/3D Mill Post Data |
| amp | Connectivity Memory Model AMPA and NMDA Parameters Data |
| amp | RMCProfile Bragg Amplitudes Data |
| amr | BrainVoyager QX Anatomical Slices |
| amsorm | OnLine Ringman Auction Client |
| amst | Atomic Mail Sender Template |
| amt | Abbyy FineReader Dictionary Data |
| amt | Alphacam 2D/3D Mill Tool Data |
| amt | ArtMoney Table |
| amts | eXtendable Wad Editor AMTS Data |
| amu | Sony PictureGear Studio Photo Album |
| amw | Alcorn McBride Show Control Data |
| amw | SPSS AMOS Data |
| amx | Alpha Micro Operating System Data |
| amy | Actual Meteorological Year Data |
| amz | Amazon MP3 Downloader Data |
| an | ETCBC Analysis Data |
| an2 | Cisco MXE AN2 File |
| an3 | QuickWave 3D Radiation Pattern |
| ana | Analysis for Windows Structure |
| ana | DB-MAIN Analysis Assistant Script Data |
| analysislog | SecuROM Analysis Log |
| anat | XNBC Network Anatomy Data |
| anc | Alphacam NC Program |
| anf | ANSYS Neutral File |
| ang | AIMSUN NG Data |
| ang | CYANA Torsion Angle File |
| anh | ActivTrak Net View History Data |
| ani | CRYSTALS Chemical Crystallography Data |
| anim | Autodesk Maya 3D Animation Data |
| anim | Unity 3D Animation Data |
| animations | Stardock SkinStudio Animations Data |
| anime | Anime Studio JSON Data |
