| ae | SoftQuad Author/Editor Document |
| aed | Alphacam Wire EDM Drawing |
| aeh | EBooksWriter E-book Document |
| af2 | Micrografx ABC FlowCharter 2 Document |
| af3 | Micrografx ABC FlowCharter 3 Document |
| afd | Alphacam Flame Drawing |
| afdesign | Affinity Design Document |
| aff | AnyForm Form Document |
| BART Animated File Format |
| afpub | Affinity Publisher Document |
| aft | AnyForm Template |
| aftemplate | Affinity Design Template |
| agd1 | Adobe FreeHand for Mac Drawing |
| agn | Psion Series 3 Agenda Document |
| agp | Aspen Graphics Workspace |
| agz | AggFlow Aggregate Plant Flow Diagram |
| ahf | Applet Headline Factory Document |
| aht | AH Note Text Document |
| aib | ArcInfo Binary Coverage |
| aig | Abracadata Drawing |
| 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 |
| amt | Artista Embroidery Template |
| 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 |
| apa | AlfaPad Notes Organizer Document |
| apcdoc | Ashampoo Photo Commander Document |
| apd | Alphacam Punch Drawing |
| Arcplan Enterprise Document |
| 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 |
| apt | Lotus Approach Data View |
| apxl | iWork Keynote XML Presentation |
| ard | Alphacam Router Drawing |
| Esko ArtiosCAD Document |
| ark | OpenBook Document |
| arr | Remedy ARS Report |
| art | ArtCAM Model File |
| Artista v4 Embroidery Data |
| art3 | Art Text Drawing |
| art6 | Articulate Presenter Online Document |
| article | Twixl Publisher Article |
| arx | Artista Cross Stitch Embroidery Data |
| as5 | CivilCAD v5 ASCII Document |
| asc | ASCII Armored GPG/PGP File |
| Plain Text Document |
| ascii | Plain Text Document |
| asd | Alphacam Stone Drawing |
| Astound Media Data |
| Astound Presentation |
| Microsoft Word AutoRecovery File |
| ase | Aseprite Sprite Data |
| Autodesk 3D Studio ASCII Scene Export |
| aseprite | Aseprite Sprite Data |
| asm | Solid Edge Assemblies Document |
| asp | ASAP WebShow Presentation |
| Astound Presentation |
| assbin | Allegorithmic Substance Painter Scene |
| ast | Ability Spreadsheet Template |
| Astound Media Data |
| ClarisWorks Assistant |
| astx | Adobe Story Exported Script |
| asy | Asymptote Document |
| at2 | Aldus Persuasion v2 Template |
| at65 | Adobe PageMaker for Mac 6.5 Template |
| atd | Alphacam Lathe Drawing |
| atl | IR Prognosis Atlas Document |
| atom | Atom Syndication Format File |
| atw | AnyTime Organizer Deluxe Document |
| av | Final Draft AV v1 Document |
| avery | Avery Design and Print Online Label |
| aw | Applixware Words Document |
| awd | Ability Draw Document |
| Microsoft Fax Image |
| awg | Ability Draw Vector Graphic |
| awp | Ability Write Template |
| aws | Ability Spreadsheet Document |
| awss | Microsoft Works for Mac Spreadsheet |
| awt | AbiWord Template |
| aww | Ability Write Document |
| awwp | Microsoft Works for Mac Document |
| ax2 | Apex Sketch v2 Document |
