| .A3L | Adobe Systems Incorporated | Fichiers de données | Authorware 3 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A3M | Adobe Systems Incorporated | Fichiers de données | Authorware 3 Macintosh File | Adobe Authorware | Adobe Systems Incorporated |
| .A3W | Adobe Systems Incorporated | Fichiers de données | Authorware 3 Windows File | Adobe Authorware | Adobe Systems Incorporated |
| .A4L | Adobe Systems Incorporated | Fichiers de données | Authorware 4 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A4M | Adobe Systems Incorporated | Fichiers de données | Adobe Authorware Unpackaged File | Adobe Authorware | Adobe Systems Incorporated |
| .A4P | Avanquest Software | Fichiers Web | A4Desk Pro Project File | Adobe Authorware | Adobe Systems Incorporated |
| .A4R | Adobe Systems Incorporated | Fichiers de données | Adobe Authorware Package Course Data | Adobe Authorware | Adobe Systems Incorporated |
| .A4W | Adobe Systems Incorporated | Fichiers de données | Authorware 4 Windows File | Adobe Authorware | Adobe Systems Incorporated |
| .A50 | Adobe Systems Incorporated | Fichiers textes | Adobe Authorware Library File | Adobe Authorware | Adobe Systems Incorporated |
| .A5L | Adobe Systems Incorporated | Fichiers de données | Authorware 5 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A65 | Adobe Systems Incorporated | Fichiers de données | Authorware 6.5 File | Adobe Authorware | Adobe Systems Incorporated |
| .A6P | Adobe Systems Incorporated | Fichiers exécutables | Authorware 6 Program | Adobe Authorware | Adobe Systems Incorporated |
| .AAB | Adobe Systems Incorporated | Fichiers de données | Adobe Authorware Binary Data | Adobe Authorware | Adobe Systems Incorporated |
| .AAC | Xilisoft Corporation | Fichiers audio | Advanced Audio Coding File | Adobe Audition | Adobe Systems Incorporated |
| .AAF | Avid Technology | Fichiers vidéo | Advanced Authoring Format File | Adobe After Effects | Adobe Systems Incorporated |
| .AAM | Adobe Systems Incorporated | Fichiers de données | Authorware Map File | Adobe Authorware | Adobe Systems Incorporated |
| .AAS | Adobe Systems Incorporated | Fichiers de données | Adobe Authorware Shocked Packet File | Adobe Authorware | Adobe Systems Incorporated |
| .AAUI | Adobe Systems Incorporated | Fichiers de plugin | Acrobat User Interface File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .ABC | Adobe Systems Incorporated | Fichiers de développeurs | ActionScript Byte Code File | Adobe Flash Player | Adobe Systems Incorporated |
| .ABR | Adobe Systems Incorporated | Fichiers divers | Adobe Photoshop Brushes File | Adobe Photoshop | Adobe Systems Incorporated |
| .ACB | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Color Book File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ACF | Valve | Fichiers de jeu | Steam Application Cache File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ACK | Adobe Systems Incorporated | Fichiers de plugin | Swifty Data | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ACO | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Color Swatch File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ACP | Alfresco Software, Inc. | Fichiers de sauvegarde | Alfresco Content Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .ACSM | Adobe Systems Incorporated | Fichiers eBook | Adobe Content Server Message File | Adobe Creative Cloud | Adobe Systems Incorporated |
| .ACTIONSCRIPT | Adobe Systems Incorporated | Fichiers de développeurs | Adobe Flash ActionScript Data | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ACV | Adobe Systems Incorporated | Fichiers de paramètres | Photoshop Curves File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ADM | Microsoft Corporation | Fichiers système | Administrative Template File | Adobe Creative Suite | Adobe Systems Incorporated |
| .ADO | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Duotone Options File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AEC | MAXON Computer | Fichiers vidéo | Cinema 4D After Effects Import Composition File | Adobe After Effects | Adobe Systems Incorporated |
| .AEP | Adobe Systems Incorporated | Fichiers vidéo | After Effects Project | Adobe After Effects | Adobe Systems Incorporated |
| .AER | Adobe Systems Incorporated | Fichiers de données | Adobe Atmosphere World | Adobe Atmosphere | Adobe Systems Incorporated |
| .AES | Open Source | Fichiers encodés | AES Crypt Encrypted File | Adobe After Effects | Adobe Systems Incorporated |
| .AET | Adobe Systems Incorporated | Fichiers vidéo | After Effects Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AETX | Adobe Systems Incorporated | Fichiers vidéo | After Effects XML Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AEX | Adobe Systems Incorporated | Fichiers de plugin | After Effects Plug-in | Adobe After Effects | Adobe Systems Incorporated |
| .AFM | Adobe Systems Incorporated | Fichiers de police d’écriture | Adobe Font Metrics File | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AFX | Auto FX Software | Fichiers Raster Image | Auto FX PhotoGraphic Edges Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .AGGR | Adobe Systems Incorporated | Fichiers de données | Adobe Captivate Aggregate File | Adobe Captivate | Adobe Systems Incorporated |
| .AHS | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Halftone Screen File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AHU | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop HSL File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AI | Adobe Systems Incorporated | Fichiers d’image vectorielle | Adobe Illustrator File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AI3 | Adobe Systems Incorporated | Fichiers graphiques | Generic Encapsulated PostScript Graphic Format File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AI4 | Adobe Systems Incorporated | Fichiers d’image vectorielle | Encapsulated PostScript File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AIA | MIT Media Lab | Fichiers divers | App Inventor Project | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AIF | Apple | Fichiers audio | Audio Interchange File Format | Adobe Audition | Adobe Systems Incorporated |
| .AIFC | Apple | Fichiers audio | Compressed Audio Interchange File | Adobe Audition | Adobe Systems Incorporated |
| .AIFF | Apple | Fichiers audio | Audio Interchange File Format | Adobe Audition | Adobe Systems Incorporated |
| .AIP | Adobe Systems Incorporated | Fichiers de plugin | Illustrator Plug-in | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AIR | Adobe Systems Incorporated | Fichiers exécutables | Adobe AIR Installation Package | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .AIT | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Illustrator Template | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ALI | Microsoft Corporation | Fichiers de données | Dynamics AX Label Index File | Adobe RoboHelp | Adobe Systems Incorporated |
| .ALV | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Levels File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMP | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Curves Map File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMS | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Monitor Setup File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMX | Valve | Fichiers de plugin | AMX Mod Plugin File | Adobe After Effects | Adobe Systems Incorporated |
| .AN | Adobe Systems Incorporated | Fichiers Web | Adobe Edge Animate Project File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ANNOT | Adobe Systems Incorporated | Fichiers divers | Adobe Digital Editions Annotations File | Adobe Digital Editions | Adobe Systems Incorporated |
| .AOM | Adobe Systems Incorporated | Fichiers de paramètres | After Effects Output Module | Adobe After Effects | Adobe Systems Incorporated |
| .APE | Nullsoft | Fichiers de plugin | AVS Plugin Effects File | Adobe Audition | Adobe Systems Incorporated |
| .APF | Adobe Systems Incorporated | Fichiers divers | Adobe Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .API | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Inks File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ARI | ARRI Group | Fichiers Raw 'appareil photo | ARRIRAW Image | Adobe SpeedGrade | Adobe Systems Incorporated |
| .ARS | Adobe Systems Incorporated | Fichiers de paramètres | After Effects Render Settings File | Adobe After Effects | Adobe Systems Incorporated |
| .ART | Autodesk, Inc. | Fichiers CAD | ArtCAM Model | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ARW | Sony | Fichiers Raw 'appareil photo | Sony Digital Camera Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .AS | Adobe Systems Incorporated | Fichiers de développeurs | Adobe ActionScript File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ASC | Symantec Corporation | Fichiers encodés | PGP (Pretty Good Privacy) ASCII Armored File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ASCX | Microsoft Corporation | Fichiers Web | ASP.NET User Control File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ASE | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Swatch Exchange File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ASL | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Style | Adobe Photoshop | Adobe Systems Incorporated |
| .ASND | Adobe Systems Incorporated | Fichiers de données | Adobe Sound Document | Adobe Audition | Adobe Systems Incorporated |
| .ASO | Adobe Systems Incorporated | Fichiers de développeurs | ActionScript Object | Adobe Creative Cloud | Adobe Systems Incorporated |
| .ASP | Microsoft Corporation | Fichiers Web | Active Server Page | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ASPX | Microsoft Corporation | Fichiers Web | Active Server Page Extended ASP.NET Script | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ASR | Adobe Systems Incorporated | Fichiers Web | ActionScript Remote Document | Adobe Dreamweaver | Adobe Systems Incorporated |
| .AST | Apple | Fichiers de données | ClarisWorks Assistant File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ASV | MakeMusic, Inc. | Fichiers de sauvegarde | Finale Auto-save File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AT2 | Adobe Systems Incorporated | Fichiers de données | Adobe Persuasion Auto Template | Aldus PhotoStyler | Adobe Systems Incorporated |
| .ATF | Molecular Devices | Fichiers de données | Axon Text File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ATN | Adobe Systems Incorporated | Fichiers de paramètres | Photoshop Actions File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AU | Open Source | Fichiers audio | Audacity Audio File | Adobe Audition | Adobe Systems Incorporated |
| .AVA | Open Source | Fichiers eBook | AvaaBook eBook | Adobe Photoshop | Adobe Systems Incorporated |
| .AVS | Adobe Systems Incorporated | Fichiers de données | Adobe Photoshop Variations File | Adobe Photoshop | Adobe Systems Incorporated |
| .AWE | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Acrobat Bookmark XML Data | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AWF | Adobe Systems Incorporated | Fichiers 3D | Adobe WorkFlow Workgroup Plugin | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AXT | Adobe Systems Incorporated | Fichiers de paramètres | Adobe Photoshop Extract File | Adobe Photoshop CC | Adobe Systems Incorporated |
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