| amiramesh | Amira 3D Mesh Data |
| amj | AceMoney Database |
| amk | AceMoney Backup File |
| aml | AutoMate Markup Language Data |
| amm | All My Movies Database |
| amm | Alphacam 2D/3D Mill Param Macro |
| amm | Autodesk Moldflow Model |
| amn | Markush AMN File |
| amo | AIM Module |
| amodel | ActiveModeler Avantage Model |
| amp | Alphacam 2D/3D Mill Post Data |
| amp | RMCProfile Bragg Amplitudes Data |
| amr | BrainVoyager QX Anatomical Slices |
| amsorm | OnLine Ringman Auction Client |
| amst | Atomic Mail Sender Template |
| amt | Alphacam 2D/3D Mill Tool Data |
| amt | ArtMoney Table |
| amts | eXtendable Wad Editor AMTS Data |
| amu | Sony PictureGear Studio Photo Album |
| 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 |
| anat | XNBC Network Anatomy Data |
| anc | Alphacam NC Program |
| anf | ANSYS Neutral File |
| ang | CYANA Torsion Angle File |
| anh | ActivTrak Net View History Data |
| anime | Anime Studio JSON Data |
| aniso | CRYSTALS Chemical Crystallography Data |
| anki | Anki Data |
| anl | Alphacam Nest List |
| anme | Anime Studio Data |