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