| aml | AutoMate Markup Language Data |
| amm | Alphacam 2D/3D Mill Param Macro |
| amm | Autodesk Moldflow Model |
| amm | All My Movies Database |
| amn | Markush AMN File |
| amo | AIM Module |
| amodel | ActiveModeler Avantage Model |
| amp | Alphacam 2D/3D Mill Post Data |
| amr | BrainVoyager QX Anatomical Slices |
| amt | ArtMoney Table |
| amt | Alphacam 2D/3D Mill Tool Data |
| amu | Sony PictureGear Studio Photo Album |
| amy | Actual Meteorological Year Data |
| amz | Amazon MP3 Downloader Data |
| an2 | Cisco MXE AN2 File |
| an3 | QuickWave 3D Radiation Pattern |
| ana | Analysis for Windows Structure |
| anat | XNBC Network Anatomy Data |
| anc | Alphacam NC Program |
| anf | ANSYS Neutral File |
| ang | CYANA Torsion Angle File |
| anki | Anki Data |
| anl | Alphacam Nest List |
| ann | Windows Help Annotations |
| annot | FreeSurfer Annotation |
| ano | Vaa3D ANO Data |
| anp | Annotis Mail Data |
| ans | HotDocs Answer |
| ant | Xilinx ISE ANT File |
| ant | Radio Mobile Antenna Definition |
| anw | Anno Wallet Backup File |
| anx | HotDocs Answer |
| any | AnyRail Layout Plan |
| aoc | IBM Tivoli Network Manager AOC File |
| aod | Microsoft Dynamics AX Application Object Data |