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