| ait | Adobe Illustrator Template |
| ajd | Alphacam Water Jet Drawing |
| ak | TracerCAD File |
| al3d | Alicona Imaging AL3D File |
| ala | Alan IF Document |
| ald | Alphacam Laser Drawing |
| ald5 | Adobe PageMaker 5 for Mac Document |
| all | Lotus 1-2-3 Worksheet Formatting Data |
| amd | Alphacam 2D/3D Mill Drawing |
| amh | AudioMulch Document |
| amt50 | Bernina Embroidery Software v5.0 Template |
| amt60 | Bernina Embroidery Software v6.0 Template |
| an8 | Anim8or Document |
| anb | i2 Analyst's Notebook Data |
| android | Android Related Readme |
| anh | Adobe Project ROME File |
| ans | ANSI Art Text |
| antmpl | Adobe Edge Animate Template |
| ao | ActionOutline Outline |
| apcdoc | Ashampoo Photo Commander Document |
| apd | Alphacam Punch Drawing |
| apib | API Blueprint Document |
| apm | Adobe Persuasion Metafile |
| apo | Abacre Paperless Office Portable Document |
| appt | Authentica Secure Office Protected PowerPoint Document |
| apr | Lotus Approach 97 Document |
| apxl | iWork Keynote XML Presentation |
| ard | Alphacam Router Drawing |
| ark | OpenBook Document |
| arr | Remedy ARS Report |
| art | ArtCAM Model File |
| art3 | Art Text Drawing |
| art6 | Articulate Presenter Online Document |
| article | Twixl Publisher Article |
| as5 | CivilCAD v5 ASCII Document |