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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .A2L | Vector Informatik | CAD Files | ASAP2 ECU Description File | Hexplorer | Open Source |
| .AC | GNU Operating System | CAD Files | Autoconf Script | GNU Autoconf | GNU Operating System |
| .ACT | Bell Labs | CAD Files | ADPCM Compressed Audio File | Unknown Software | Unknown Developer |
| .ADI | Active@ Data Recovery Software | CAD Files | Active@ Disk Image Backup File | Active@ Disk Image | LSoft Technologies Inc. |
| .ADJ | Microsoft partner network | CAD Files | LISCAD Adjustment File | LISCAD | Microsoft partner network |
| .ADP | Microsoft Corporation | CAD Files | Access Project Extension | Microsoft Access | Microsoft Corporation |
| .ADT | Swiftpage, Inc. | CAD Files | ACT! Document Template | Swiftpage Act | Swiftpage, Inc. |
| .AEC | MAXON Computer | CAD Files | Cinema 4D After Effects Import Composition File | MAXON Cinema 4D | MAXON Computer |
| .AED | Planit Solutions, Inc. | CAD Files | Alphacam Wire EDM Drawing | Planit Alphacam | Planit Solutions, Inc. |
| .AEF | Autodesk, Inc. | CAD Files | ELECTRICAL Designe | Autocad Electrical | Autodesk, Inc. |
| .AFD | Planit Solutions, Inc. | CAD Files | Alphacam Flame Drawing | Planit Alphacam | Planit Solutions, Inc. |
| .AFP | Garmin | CAD Files | XMap Flight Plan Statistic File | XMap | Garmin |
| .AFS | Bentley Systems | CAD Files | STAAD.foundation Project File | Bentley Systems STAAD Foundation Advanced | Bentley Systems |
| .AGZ | BedRock Software Inc. | CAD Files | AggFlow Aggregate Plant Flow Diagram | AggFlow | BedRock Software Inc. |
| .AIG | MCS Investments, Inc. | CAD Files | Architecture Drawing | Design Your Own Home Architecture | MCS Investments, Inc. |
| .AMB | Bolide Software | CAD Files | All My Books Database File | All My Books | Bolide Software |
| .AMD | Planit Solutions, Inc. | CAD Files | Alphacam 3D Mill/2D Mill Drawing | Planit Alphacam | Planit Solutions, Inc. |
| .AMT | Planit Solutions, Inc. | CAD Files | Alphacam 3D Mill, 2D Mill Tool | Planit Alphacam | Planit Solutions, Inc. |
| .ANL | Planit Solutions, Inc. | CAD Files | Alphacam Nest List | Planit Alphacam | Planit Solutions, Inc. |
| .ANS | Open Source | CAD Files | ANSI Text File | Microsoft Notepad | Microsoft Corporation |
| .ANY | DRail Modelspoor Software | CAD Files | AnyRail Layout Plan | AnyRail | DRail Modelspoor Software |
| .APJ | The FreeBSD Community | CAD Files | FreeBSD File | FreeBSD | The FreeBSD Community |
| .APP | Nokia | CAD Files | Symbian OS Application | Symbian OS | Nokia |
| .ARD | Esko | CAD Files | ArtiosCAD Workspace File | ArtiosCAD | Esko |
| .ART | Autodesk, Inc. | CAD Files | ArtCAM Model | ArtCAM | Autodesk, Inc. |
| .ASC | Symantec Corporation | CAD Files | PGP (Pretty Good Privacy) ASCII Armored File | Mozilla Thunderbird | Mozilla |
| .ASM | Open Source | CAD Files | Assembly Language Source Code File | Microsoft Notepad | Microsoft Corporation |
| .ASP | Microsoft Corporation | CAD Files | Active Server Page | Mozilla Firefox | Mozilla |
| .ASY | Linear Technology | CAD Files | LTspice IV Circuit Diagram File | LTspice | Linear Technology |
| .ATB | AnetSoft | CAD Files | AnetHelp Tools File | AnetHelpTool | AnetSoft |
| .ATD | Planit Solutions, Inc. | CAD Files | Alphacam Lathe Drawing | Planit Alphacam | Planit Solutions, Inc. |
| .ATH | Dell Boomi | CAD Files | Alienware AlienFX Theme File | Microsoft XML Notepad | Microsoft Corporation |
| .ATP | Planit Solutions, Inc. | CAD Files | Alphacam Lathe Post File | Planit Alphacam | Planit Solutions, Inc. |
| .ATT | Unknown Developer | CAD Files | Web Form Post Data File | LibreOffice | The Document Foundation |
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