| 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 |
| anime | Anime Studio JSON Data |
| aniso | CRYSTALS Chemical Crystallography Data |
| anki | Anki Data |
| anl | Alphacam Nest List |
| anme | Anime Studio Data |
| ann | Windows Help Annotations |
| ann | ENVI Annotation Data |
| annot | FreeSurfer Annotation |
| ano | Vaa3D ANO Data |
| anp | Annotis Mail Data |
| ans | HotDocs Answer |
| ansa | LS-OPT ANSA Morph Data |
| ansr | AnswerTool Answer Data |
| ant | Radio Mobile Antenna Definition |
| ant | Xilinx ISE ANT File |
| anw | Anno Wallet Backup File |
| anx | HotDocs Answer |
| any | AnyRail Layout Plan |
| anydvd | AnyDVD Registration Data |
