| .0B | Adobe Systems Incorporated | フォントファイル | Adobe PageMaker Printer Font | Adobe PageMaker | Adobe Systems Incorporated |
| .12U | Adobe Systems Incorporated | フォントファイル | Adobe PageMaker Font File | Adobe PageMaker | Adobe Systems Incorporated |
| .3DF | Informative Graphics Corporation | ３Dファイル | 3D Format | Adobe Creative Cloud | Adobe Systems Incorporated |
| .3DS | Autodesk, Inc. | ３Dファイル | 3D Studio Scene | Adobe Photoshop CC | Adobe Systems Incorporated |
| .3DXML | Dassault Systèmes | ３Dファイル | Dassault Systemes 3D XML File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .3FR | Hasselblad | カメラのRawファイル | Hasselblad 3F RAW Image | Adobe Photoshop Express | Adobe Systems Incorporated |
| .3GP | Various Developers | ビデオファイル | 3GPP Media File | Adobe Flash Player | Adobe Systems Incorporated |
| .3GPA | Open Source | オーディオファイル | 3GPP Multimedia File | Adobe Flash Professional CC | Adobe Systems Incorporated |
| .3GPP | Various Developers | ビデオファイル | 3GPP Media File | Adobe Flash Player | Adobe Systems Incorporated |
| .3GPP2 | Apple | ビデオファイル | Multimedia Files For Wireless Networks | Adobe Flash Professional CC | Adobe Systems Incorporated |
| .3P2 | Open Source | オーディオファイル | 3GPP Multimedia File | Adobe Flash Professional CC | Adobe Systems Incorporated |
| .509 | Microsoft Corporation | ウェブファイル | Internet Security Certificate | Adobe Acrobat DC | Adobe Systems Incorporated |
| .747 | Adobe Systems Incorporated | その他ファイル | CS6 Extension Manager Report | Adobe Creative Suite | Adobe Systems Incorporated |
| .8BE | Adobe Systems Incorporated | プラグインファイル | Adobe Photoshop Plug-in Filter | Adobe Photoshop | Adobe Systems Incorporated |
| .8BF | Adobe Systems Incorporated | プラグインファイル | Photoshop Filter Plug-in | Adobe Illustrator CC | Adobe Systems Incorporated |
| .8BI | Corel | プラグインファイル | Photoshop Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8BI8 | Adobe Systems Incorporated | プラグインファイル | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BP | Adobe Systems Incorporated | プラグインファイル | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BPS | Adobe Systems Incorporated | 画像ファイル | Adobe Photoshop Data File | Adobe Photoshop | Adobe Systems Incorporated |
| .8BS | Adobe Systems Incorporated | プラグインファイル | Photoshop 5.0 Selection Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8BX | Adobe Systems Incorporated | プラグインファイル | PhotoDeluxe Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BY | Adobe Systems Incorporated | プラグインファイル | PhotoDeluxe Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8LI | Adobe Systems Incorporated | プラグインファイル | Photoshop Scripting Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .8LY | Corel | プラグインファイル | Photoshop Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8M | Adobe Systems Incorporated | フォントファイル | PageMaker Math 8 Printer Font | Adobe PageMaker | Adobe Systems Incorporated |
| .8TY | Adobe Systems Incorporated | プラグインファイル | Adobe Photoshop File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .8U | Adobe Systems Incorporated | フォントファイル | Adobe Pagemaker Roman 8 Extended Character Set Printer Font | Adobe PageMaker | Adobe Systems Incorporated |
| .A3L | Adobe Systems Incorporated | データファイル | Authorware 3 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A3M | Adobe Systems Incorporated | データファイル | Authorware 3 Macintosh File | Adobe Authorware | Adobe Systems Incorporated |
| .A3W | Adobe Systems Incorporated | データファイル | Authorware 3 Windows File | Adobe Authorware | Adobe Systems Incorporated |
| .A4L | Adobe Systems Incorporated | データファイル | Authorware 4 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A4M | Adobe Systems Incorporated | データファイル | Adobe Authorware Unpackaged File | Adobe Authorware | Adobe Systems Incorporated |
| .A4P | Avanquest Software | ウェブファイル | A4Desk Pro Project File | Adobe Authorware | Adobe Systems Incorporated |
| .A4R | Adobe Systems Incorporated | データファイル | Adobe Authorware Package Course Data | Adobe Authorware | Adobe Systems Incorporated |
| .A4W | Adobe Systems Incorporated | データファイル | Authorware 4 Windows File | Adobe Authorware | Adobe Systems Incorporated |
| .A50 | Adobe Systems Incorporated | Textファイル | Adobe Authorware Library File | Adobe Authorware | Adobe Systems Incorporated |
| .A5L | Adobe Systems Incorporated | データファイル | Authorware 5 Library | Adobe Authorware | Adobe Systems Incorporated |
| .A65 | Adobe Systems Incorporated | データファイル | Authorware 6.5 File | Adobe Authorware | Adobe Systems Incorporated |
| .A6P | Adobe Systems Incorporated | 実行ファイル | Authorware 6 Program | Adobe Authorware | Adobe Systems Incorporated |
| .AAB | Adobe Systems Incorporated | データファイル | Adobe Authorware Binary Data | Adobe Authorware | Adobe Systems Incorporated |
| .AAC | Xilisoft Corporation | オーディオファイル | Advanced Audio Coding File | Adobe Audition | Adobe Systems Incorporated |
| .AAF | Avid Technology | ビデオファイル | Advanced Authoring Format File | Adobe After Effects | Adobe Systems Incorporated |
| .AAM | Adobe Systems Incorporated | データファイル | Authorware Map File | Adobe Authorware | Adobe Systems Incorporated |
| .AAS | Adobe Systems Incorporated | データファイル | Adobe Authorware Shocked Packet File | Adobe Authorware | Adobe Systems Incorporated |
| .AAUI | Adobe Systems Incorporated | プラグインファイル | Acrobat User Interface File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .ABC | Adobe Systems Incorporated | 開発者ファイル | ActionScript Byte Code File | Adobe Flash Player | Adobe Systems Incorporated |
| .ABR | Adobe Systems Incorporated | その他ファイル | Adobe Photoshop Brushes File | Adobe Photoshop | Adobe Systems Incorporated |
| .ACB | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Color Book File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ACF | Valve | ゲームファイル | Steam Application Cache File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ACK | Adobe Systems Incorporated | プラグインファイル | Swifty Data | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ACO | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Color Swatch File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ACP | Alfresco Software, Inc. | バックアップファイル | Alfresco Content Package | Adobe Acrobat DC | Adobe Systems Incorporated |
| .ACSM | Adobe Systems Incorporated | eBookファイル | Adobe Content Server Message File | Adobe Creative Cloud | Adobe Systems Incorporated |
| .ACTIONSCRIPT | Adobe Systems Incorporated | 開発者ファイル | Adobe Flash ActionScript Data | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ACV | Adobe Systems Incorporated | 設定ファイル | Photoshop Curves File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ADM | Microsoft Corporation | システムファイル | Administrative Template File | Adobe Creative Suite | Adobe Systems Incorporated |
| .ADO | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Duotone Options File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AEC | MAXON Computer | ビデオファイル | Cinema 4D After Effects Import Composition File | Adobe After Effects | Adobe Systems Incorporated |
| .AEP | Adobe Systems Incorporated | ビデオファイル | After Effects Project | Adobe After Effects | Adobe Systems Incorporated |
| .AER | Adobe Systems Incorporated | データファイル | Adobe Atmosphere World | Adobe Atmosphere | Adobe Systems Incorporated |
| .AES | Open Source | 暗号化ファイル | AES Crypt Encrypted File | Adobe After Effects | Adobe Systems Incorporated |
| .AET | Adobe Systems Incorporated | ビデオファイル | After Effects Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AETX | Adobe Systems Incorporated | ビデオファイル | After Effects XML Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AEX | Adobe Systems Incorporated | プラグインファイル | After Effects Plug-in | Adobe After Effects | Adobe Systems Incorporated |
| .AFM | Adobe Systems Incorporated | フォントファイル | Adobe Font Metrics File | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AFX | Auto FX Software | ラスターイメージファイル | Auto FX PhotoGraphic Edges Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .AGGR | Adobe Systems Incorporated | データファイル | Adobe Captivate Aggregate File | Adobe Captivate | Adobe Systems Incorporated |
| .AHS | Adobe Systems Incorporated | 設定ファイル | Adobe Halftone Screen File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AHU | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop HSL File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AI | Adobe Systems Incorporated | ベクターイメージファイル | Adobe Illustrator File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AI3 | Adobe Systems Incorporated | 画像ファイル | Generic Encapsulated PostScript Graphic Format File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AI4 | Adobe Systems Incorporated | ベクターイメージファイル | Encapsulated PostScript File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AIA | MIT Media Lab | その他ファイル | App Inventor Project | Adobe Creative Cloud | Adobe Systems Incorporated |
| .AIF | Apple | オーディオファイル | Audio Interchange File Format | Adobe Audition | Adobe Systems Incorporated |
| .AIFC | Apple | オーディオファイル | Compressed Audio Interchange File | Adobe Audition | Adobe Systems Incorporated |
| .AIFF | Apple | オーディオファイル | Audio Interchange File Format | Adobe Audition | Adobe Systems Incorporated |
| .AIP | Adobe Systems Incorporated | プラグインファイル | Illustrator Plug-in | Adobe Illustrator CC | Adobe Systems Incorporated |
| .AIR | Adobe Systems Incorporated | 実行ファイル | Adobe AIR Installation Package | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .AIT | Adobe Systems Incorporated | 設定ファイル | Adobe Illustrator Template | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ALI | Microsoft Corporation | データファイル | Dynamics AX Label Index File | Adobe RoboHelp | Adobe Systems Incorporated |
| .ALV | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Levels File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMP | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Curves Map File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMS | Adobe Systems Incorporated | 設定ファイル | Adobe Monitor Setup File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AMX | Valve | プラグインファイル | AMX Mod Plugin File | Adobe After Effects | Adobe Systems Incorporated |
| .AN | Adobe Systems Incorporated | ウェブファイル | Adobe Edge Animate Project File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ANNOT | Adobe Systems Incorporated | その他ファイル | Adobe Digital Editions Annotations File | Adobe Digital Editions | Adobe Systems Incorporated |
| .AOM | Adobe Systems Incorporated | 設定ファイル | After Effects Output Module | Adobe After Effects | Adobe Systems Incorporated |
| .APE | Nullsoft | プラグインファイル | AVS Plugin Effects File | Adobe Audition | Adobe Systems Incorporated |
| .APF | Adobe Systems Incorporated | その他ファイル | Adobe Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .API | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Inks File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .ARI | ARRI Group | カメラのRawファイル | ARRIRAW Image | Adobe SpeedGrade | Adobe Systems Incorporated |
| .ARS | Adobe Systems Incorporated | 設定ファイル | After Effects Render Settings File | Adobe After Effects | Adobe Systems Incorporated |
| .ART | Autodesk, Inc. | CADファイル | ArtCAM Model | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ARW | Sony | カメラのRawファイル | Sony Digital Camera Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .AS | Adobe Systems Incorporated | 開発者ファイル | Adobe ActionScript File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ASC | Symantec Corporation | 暗号化ファイル | PGP (Pretty Good Privacy) ASCII Armored File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ASCX | Microsoft Corporation | ウェブファイル | ASP.NET User Control File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .ASE | Adobe Systems Incorporated | 設定ファイル | Adobe Swatch Exchange File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ASL | Adobe Systems Incorporated | 設定ファイル | Adobe Photoshop Style | Adobe Photoshop | Adobe Systems Incorporated |
| .ASND | Adobe Systems Incorporated | データファイル | Adobe Sound Document | Adobe Audition | Adobe Systems Incorporated |
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