| .IGN | Adobe Systems Incorporated | Data Files | RoboHelp Ignore List File | Adobe RoboHelp | Adobe Systems Incorporated |
| .IMP | Lotus Software | Spreadsheet Files | Improv Spreadsheet File | Adobe Audition | Adobe Systems Incorporated |
| .IMS | CursorArts Company | Data Files | IconForge Create Executable Library Data | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .INC | Microsoft Corporation | Developer Files | Include File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .INCD | Adobe Systems Incorporated | Page Layout Files | InCopy Document | Adobe InDesign | Adobe Systems Incorporated |
| .INCT | Adobe Systems Incorporated | Page Layout Files | InCopy Template | Adobe InCopy | Adobe Systems Incorporated |
| .INCX | Adobe Systems Incorporated | Page Layout Files | InCopy CS3 Interchange File | Adobe InDesign | Adobe Systems Incorporated |
| .IND | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign Document | Adobe InDesign | Adobe Systems Incorporated |
| .INDD | Adobe Systems Incorporated | Page Layout Files | Adobe InDesign Document | Adobe InDesign | Adobe Systems Incorporated |
| .IRS | Adobe Systems Incorporated | Settings Files | Adobe Save For Web Settings | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ISA | Adobe Systems Incorporated | Developer Files | Adobe Photoshop ImageReady Action Data | Adobe Photoshop | Adobe Systems Incorporated |
| .IST | Flexera Software | Developer Files | InstallShield Project Template File | ImageStyler | Adobe Systems Incorporated |
| .IX | Corel | Text Files | Corel WordPerfect Office Template File | Adobe FrameMaker | Adobe Systems Incorporated |
| .J | Oracle Corporation | Developer Files | Java Source File | Adobe Photoshop | Adobe Systems Incorporated |
| .J2K | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JDF | Adobe Systems Incorporated | Settings Files | Adobe Acrobat Job Definition File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .JDT | Adobe Systems Incorporated | Data Files | Accelio Capture Classic Filler Data | Accelio Capture Classic Filler | Adobe Systems Incorporated |
| .JFI | Joint Photographic Experts Group | Raster Image Files | JPEG File Interchange Image | Adobe Photoshop | Adobe Systems Incorporated |
| .JIF | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JOBOPTIONS | Adobe Systems Incorporated | Data Files | Adobe Joboptions File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JP2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Core Image File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .JPC | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Code Stream File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPEG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPF | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPG | Joint Photographic Experts Group | Raster Image Files | JPEG Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPG-LARGE | Zoner Software | Raster Image Files | Large JPEG Image | Adobe Photoshop | Adobe Systems Incorporated |
| .JPG2 | Joint Photographic Experts Group | Raster Image Files | JPEG 2000 Image | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JPS | Open Source | Backup Files | Akeeba Backup Archive | Adobe Photoshop CC | Adobe Systems Incorporated |
| .JPX | Embarcadero Technologies | Developer Files | JBuilder Project | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JS | NetScape | Web Files | JavaScript File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSCRIPT | NetScape | Web Files | JavaScript File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSE | Microsoft Corporation | Executable Files | JScript Encoded File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSF | Adobe Systems Incorporated | Web Files | Java Script Command File | Adobe Fireworks | Adobe Systems Incorporated |
| .JSFL | Adobe Systems Incorporated | Developer Files | Animate JSFL Script File | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .JSP | Oracle Corporation | Web Files | Java Server Page | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSPA | Xinox Software | Web Files | Java Servlet Alias | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSPF | Oracle Corporation | Developer Files | Java Server Page Fragment | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JST | Jabosoft | Game Files | Jnes Save State | Adobe Dreamweaver | Adobe Systems Incorporated |
| .JSX | Adobe Systems Incorporated | Executable Files | ExtendScript Script File | Adobe After Effects | Adobe Systems Incorporated |
| .JTF | Various Developers | Raster Image Files | JPEG Tagged Interchange Format | Adobe Illustrator CC | Adobe Systems Incorporated |
| .JXR | Microsoft Corporation | Raster Image Files | JPEG XR Image | Adobe Photoshop | Adobe Systems Incorporated |
| .KDC | Kaspersky Lab | Data Files | Kaspersky Virus Database File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .KDK | Kodak | Raster Image Files | Kodak Proprietary Decimated TIFF File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .KFP | Adobe Systems Incorporated | Settings Files | Adobe Acrobat Preflight Profile File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .KIT | Bryan | Web Files | CodeKit File | Adobe Edge Code CC | Adobe Systems Incorporated |
| .KKW | Adobe Systems Incorporated | Data Files | Adobe RoboHelp Keyword Help Project Index File | Adobe RoboHelp | Adobe Systems Incorporated |
| .KYS | Adobe Systems Incorporated | Settings Files | Adobe Photoshop Keyboard Shortcuts File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .LBI | Adobe Systems Incorporated | Developer Files | Dreamweaver Library Item | Adobe Dreamweaver | Adobe Systems Incorporated |
| .LCK | Autodesk, Inc. | Uncommon Files | Program Lock File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .LESS | Adobe Systems Incorporated | Web Files | LESS Style Sheet | Adobe Dreamweaver | Adobe Systems Incorporated |
| .LEX | Adobe Systems Incorporated | Data Files | Adobe Linguistic Library Data File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .LNG | Nullsoft | Plugin Files | Winamp Language File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .LOOK | Adobe Systems Incorporated | Settings Files | SpeedGrade Look File | Adobe SpeedGrade | Adobe Systems Incorporated |
| .LRG | Macromedia | Raster Image Files | Macromedia XRes Multi-resolution Bitmap | Adobe Authorware | Adobe Systems Incorporated |
| .M15 | Moving Picture Experts Group | Video Files | MPEG Video File | Adobe Flash Player | Adobe Systems Incorporated |
| .M1V | Roxio | Video Files | MPEG-1 Video File | Adobe Flash Professional CC | Adobe Systems Incorporated |
| .M2T | Roxio | Video Files | HDV Video File | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .M2TS | Sony | Video Files | Blu-ray BDAV Video File | Adobe Flash Player | Adobe Systems Incorporated |
| .M75 | Moving Picture Experts Group | Video Files | MPEG Video File | Adobe Flash Player | Adobe Systems Incorporated |
| .MASK | Adobe Systems Incorporated | Settings Files | SpeedGrade Color Mask File | Adobe SpeedGrade | Adobe Systems Incorporated |
| .MAX | Autodesk, Inc. | 3D Image Files | 3ds Max Scene File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .MD0 | Alcohol Soft | Disk Image Files | Alcohol Disk Image Segment 1 | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MEF | Microsoft Corporation | Camera Raw Files | Mamiya RAW Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .MF2 | Adobe Systems Incorporated | Video Files | Authorware Mediator5 Multimedia File | Adobe Authorware | Adobe Systems Incorporated |
| .MFD | Yamaha Corporation | Database Files | Music Finder Database | Adobe Creative Suite | Adobe Systems Incorporated |
| .MFW | MamiyaLeaf | Camera Raw Files | Mamiya Camera Raw File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MGP | Adobe Systems Incorporated | Data Files | Adobe Captivate MenuBuilder Data | Adobe Captivate | Adobe Systems Incorporated |
| .MHTM | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .MHTML | Microsoft Corporation | Web Files | Mime HTML (MHTML) File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .MIF | Adobe Systems Incorporated | Page Layout Files | FrameMaker Interchange Format File | Adobe FrameMaker | Adobe Systems Incorporated |
| .MJ2 | Open Source | Video Files | Motion JPEG 2000 Video | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .MJD | Adobe Systems Incorporated | Encoded Files | Adobe Acrobat MIME Encoded Job Definition File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .MJP2 | Open Source | Video Files | Motion JPEG 2000 Video | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .MML | Adobe Systems Incorporated | Page Layout Files | FrameMaker Maker Markup Language File | Adobe FrameMaker | Adobe Systems Incorporated |
| .MNO | Adobe Systems Incorporated | Data Files | Macromedia Design Note | Adobe Dreamweaver | Adobe Systems Incorporated |
| .MNU | Autodesk, Inc. | Settings Files | AutoCAD Interface Layout File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MOCHA | Adobe Systems Incorporated | Graphic Files | Adobe Mocha For Adobe After Effects File | Adobe After Effects | Adobe Systems Incorporated |
| .MOOV | Apple | Video Files | Apple QuickTime Movie | Adobe Flash Player | Adobe Systems Incorporated |
| .MOS | MamiyaLeaf | Camera Raw Files | Leaf Camera RAW File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MOV | Apple | Video Files | Apple QuickTime Movie | Adobe Flash Player | Adobe Systems Incorporated |
| .MP2 | New World Computing | Game Files | Heroes Of Might And Magic II Map File | Adobe Audition | Adobe Systems Incorporated |
| .MP3 | Moving Picture Experts Group | Audio Files | MP3 Audio File | Adobe Audition | Adobe Systems Incorporated |
| .MPG | Moving Picture Experts Group | Video Files | MPEG Video File | Adobe Flash Player | Adobe Systems Incorporated |
| .MPJ | Minitab Inc | Data Files | Minitab Project File | Adobe RoboHelp | Adobe Systems Incorporated |
| .MPO | CyberLink | Raster Image Files | CIPA Multi Picture Object File | Adobe Photoshop | Adobe Systems Incorporated |
| .MRW | Konica Minolta | Camera Raw Files | Minolta Raw Image File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .MSH | Martin Schweiger | 3D Image Files | Orbiter 3D Mesh File | Visual Communicator | Adobe Systems Incorporated |
| .MTL | TurboCAD | 3D Image Files | OBJ Material File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MUSE | Adobe Systems Incorporated | Web Files | Adobe Muse Website Project | Adobe Muse CC | Adobe Systems Incorporated |
| .MXF | SMPTE | Video Files | Material Exchange Format File | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .MXI | Adobe Systems Incorporated | Data Files | Adobe Extension Information File | Adobe InCopy | Adobe Systems Incorporated |
| .MXML | Adobe Systems Incorporated | Developer Files | Flex MXML Component | Adobe Flash Builder | Adobe Systems Incorporated |
| .MXP | Adobe Systems Incorporated | Plugin Files | Adobe Extension Package | Adobe Extension Manager CC | Adobe Systems Incorporated |
| .NCR | Adobe Systems Incorporated | Raster Image Files | NCR Image | Adobe Photoshop CC | Adobe Systems Incorporated |
| .NCX | IDPF (International Digital Publishing Forum) | eBook Files | EPUB Navigation Control XML File | Adobe InDesign | Adobe Systems Incorporated |
| .NEF | Nikon | Camera Raw Files | Nikon Electronic Format Camera RAW Image | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .NRW | Nikon | Camera Raw Files | Nikon Raw Image File | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .NWM | Sony | Uncommon Files | Sony NWM Display Screen File | Adobe Photoshop | Adobe Systems Incorporated |
| .OBJ | Wavefront Technologies | 3D Image Files | Wavefront 3D Object File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .OEB | IDPF (International Digital Publishing Forum) | eBook Files | Open eBook File | Adobe InDesign | Adobe Systems Incorporated |
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