| .261 | VideoLAN | File video | H.261 Encoded Video | VLC Media Player | VideoLAN |
| .263 | VideoLAN | File video | H.263 Encoded Video | VLC Media Player | VideoLAN |
| .264 | Unknown Developer | File video | Ripped Video Data File | Roxio Toast 15 | Roxio |
| .265 | Open Source | File video | H.265 High Efficiency Video Coding Codec Encoded Video | MPlayer | The MPlayer Team |
| .26L | VideoLAN | File video | Video Data | VLC Media Player | VideoLAN |
| .3G2 | Open Source | File video | 3GPP2 Multimedia File | Apple QuickTime Player | Apple |
| .3GP | Various Developers | File video | 3GPP Media File | VLC Media Player | VideoLAN |
| .3GPP | Various Developers | File video | 3GPP Media File | VLC Media Player | VideoLAN |
| .3GPP2 | Apple | File video | Multimedia Files For Wireless Networks | Apple QuickTime Player | Apple |
| .3GP_128X96 | VideoLAN | File video | 3GP Video Data | VLC Media Player | VideoLAN |
| .3MM | Microsoft Corporation | File video | Microsoft 3D Movie Maker Video File | 3D Movie Maker | Microsoft Corporation |
| .44 | Destiny Media Technologies | File video | Clipstream 32 Kb Stream | Clipstream | Destiny Media Technologies |
| .4XM | The MPlayer Team | File video | 4XM Video Format File | MPlayer | The MPlayer Team |
| .60D | General Electric Company | File video | CCTV Video Clip | WaveReader | General Electric Company |
| .890 | Cavena | File video | Cavena Subtitles Data | URUWorks Subtitle Workshop | URUWORKS |
| .AAF | Avid Technology | File video | Advanced Authoring Format File | Adobe After Effects | Adobe Systems Incorporated |
| .ACW | Microsoft Corporation | File video | Windows Accessibility Wizard File | Microsoft Windows Accessibility Wizard | Microsoft Corporation |
| .AEC | MAXON Computer | File video | Cinema 4D After Effects Import Composition File | MAXON Cinema 4D | MAXON Computer |
| .AEP | Adobe Systems Incorporated | File video | After Effects Project | Adobe After Effects | Adobe Systems Incorporated |
| .AET | Adobe Systems Incorporated | File video | After Effects Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AETX | Adobe Systems Incorporated | File video | After Effects XML Project Template | Adobe After Effects | Adobe Systems Incorporated |
| .AJP | Interscape | File video | CCTV Video File | AJP Player | Interscape |
| .ALE | Avid Technology | File video | Avid Log Exchange File | Microsoft Notepad | Microsoft Corporation |
| .AM | GNU Operating System | File video | Automake Makefile Template | Automake | GNU Operating System |
| .AMC | Pegasys | File video | AMC Video File | Apple QuickTime Player | Apple |
| .AMV | VideoLAN | File video | Anime Music Video File | VLC Media Player | VideoLAN |
| .AMX | Valve | File video | AMX Mod Plugin File | Half-Life | Valve |
| .ANIM | Autodesk, Inc. | File video | Maya Animation File | Autodesk Maya | Autodesk, Inc. |
| .ARF | Cisco Systems | File video | WebEx Advanced Recording File | Cisco WebEx Player | Cisco Systems |
| .ASF | Microsoft Corporation | File video | Advanced Systems Format File | Microsoft Windows Media Player | Microsoft Corporation |
| .ASX | Microsoft Corporation | File video | Microsoft ASF Redirector File | VLC Media Player | VideoLAN |
| .AVB | Avid Technology | File video | Avid Bin File | Avid Media Composer | Avid Technology |
| .AVC | Kaspersky Lab | File video | Kaspersky Virus Database File | Kaspersky Anti-Virus | Kaspersky Lab |
| .AVD | Magix Software GmbH | File video | Movie Edit Pro Video Information File | MAGIX Movie Edit Pro | Magix Software GmbH |
| .AVF | SourceForge | File video | Avermedia Recorded Video Backup | Project X | SourceForge |
| .AVH | Pioneer DJ Corporation | File video | Pioneer AVH Firmware Update | Pioneer AVH | Pioneer DJ Corporation |
| .AVI | Microsoft Corporation | File video | Audio Video Interleave File | Microsoft Windows Media Player | Microsoft Corporation |
| .AVM | VideoLAN | File video | Anime Music Video File | VLC Media Player | VideoLAN |
| .AVP | Avid Technology | File video | Avid Project File | Avid Media Composer | Avid Technology |
| .AVS | Adobe Systems Incorporated | File video | Adobe Photoshop Variations File | Adobe Photoshop | Adobe Systems Incorporated |
| .AWLIVE | PYsoftware | File video | Active Webcam Video File | PY Software Active Webcam | PYsoftware |
| .AXM | AXMEDIS Products and Services | File video | AXMEDIS Object | AXMEDIS Editor | AXMEDIS Products and Services |
| .AXV | CSIRO | File video | Annodex Video File | Macgo Mac Media Player | Macgo International |
| .BAY | Casio Computer Co., Ltd. | File video | Casio RAW Image | Microsoft Windows Photos | Microsoft Corporation |
| .BBV | Huazhong University | File video | PPLive Cache File | PPLive | Huazhong University |
| .BDM | Sony | File video | AVHCD Information File | CyberLink PowerDVD | CyberLink |
| .BDMV | Various Developers | File video | Blu-ray Disc Movie Information File | CyberLink PowerDVD | CyberLink |
| .BIK | RAD Game Tools | File video | Bink Video File | Microsoft Windows Media Player | Microsoft Corporation |
| .BIX | Take-Two Interactive | File video | Civilization 3 Scenario File | Civilization | Take-Two Interactive |
| .BMC | Microsoft Corporation | File video | Bitmap Cache File | Microsoft Windows | Microsoft Corporation |
| .BMK | return7, LLC | File video | BillMinder Backup File | return7 BillMinder | return7, LLC |
| .BNP | Sony | File video | Sony Camcorder Video Data File | Sony Picture Motion Browser | Sony |
| .BOX | Unknown Developer | File video | E-mail Mailbox | Mozilla Thunderbird | Mozilla |
| .BSF | Roxio | File video | Blu-ray AVC Video File | CyberLink PowerDVD | CyberLink |
| .BU | Samsung Electronics | File video | Samsung CCTV Video File | Samsung SmartViewer | Samsung Electronics |
| .BVR | Perspective Software | File video | Blue Iris Video | Perspective Software Blue Iris | Perspective Software |
| .BYU | Brigham Young University (BYU) | File video | Brigham Young University Movie File | EnSight | ANSYS, Inc. |
| .CAMREC | TechSmith | File video | Camtasia Studio Screen Recording | TechSmith Camtasia Studio | TechSmith |
| .CDXL | Open Source | File video | CDXL Video File | MPlayer | The MPlayer Team |
| .CED | JVCKenwood Group | File video | JVC Camera Video Data File | Unknown Software | Unknown Developer |
| .CEL | Affymetrix | File video | Affymetrix Probe Results File | The MathWorks MATLAB | MathWorks |
| .CIP | Cavena | File video | Cavena Subtitles File | Cavena Toolbox | Cavena |
| .CLK | Corel | File video | Corel R.A.V.E Project File | CorelDRAW Graphics Suite | Corel |
| .CLPI | Blu-ray Disc Association | File video | Blu-ray Clip Information File | CyberLink PowerDVD | CyberLink |
| .CMMP | TechSmith | File video | Camtasia MenuMaker Project | TechSmith Camtasia Studio | TechSmith |
| .CMMTPL | TechSmith | File video | Camtasia MenuMaker Template | TechSmith Camtasia Studio | TechSmith |
| .CMPROJ | TechSmith | File video | Camtasia Project File | TechSmith Camtasia Studio | TechSmith |
| .CMV | Corel | File video | CorelMOVE Animation | CMVParser | SourceForge |
| .CPI | Sony | File video | AVCHD Video Clip Information | Adobe Premiere Pro CC | Adobe Systems Incorporated |
| .CPK | CRI Middleware | File video | CRI Middleware Package | CRI Packed File Maker | CRI Middleware |
| .CX3 | IDView | File video | CMS Recorded Video File | IDView CMS | IDView |
| .D2V | Interscape | File video | DVD2AVI File | VirtualDub | Open Source |
| .DA2 | Microsoft Corporation | File video | Windows Dancer File | Windows Media Center | Microsoft Corporation |
| .DAPROJ | DivX, LLC. | File video | DivX Author Project File | DivX | DivX, LLC. |
| .DAT | Unknown Developer | File video | Game Data | Dragon UnPACKer | Open Source |
| .DAV | DVR365 | File video | DVR365 Video File | Amcrest Smart Player | Amcrest Technologies |
| .DB2 | Samsung Electronics | File video | Samsung CCTV Video Information File | Samsung SmartViewer | Samsung Electronics |
| .DCE | LYTX | File video | DriveCam Video File | DriveCam Event Player | LYTX |
| .DGW | Digi-Watcher | File video | Digi-Watcher Video Data | Digi-Watcher | Digi-Watcher |
| .DIF | Microsoft Corporation | File video | Data Interchange Format | Microsoft Excel | Microsoft Corporation |
| .DIR | Adobe Systems Incorporated | File video | Adobe Director Movie | Adobe Director | Adobe Systems Incorporated |
| .DIV | Robert Hijmans | File video | DIVA-GIS Project File | DIVA-GIS | Robert Hijmans |
| .DIVX | DivX, LLC. | File video | DivX-Encoded Movie File | CyberLink PowerDVD | CyberLink |
| .DLX | DIAL | File video | DIALux Document | DIAL DIALux | DIAL |
| .DMB | BYOND | File video | BYOND Game Executable | BYOND | BYOND |
| .DMSD | Sonic Solutions | File video | Roxio MyDVD Project | Roxio Creator NXT Pro 6 | Roxio |
| .DMV | Adobe Systems Incorporated | File video | Adobe Acrobat Catalog Data | Adobe Acrobat DC | Adobe Systems Incorporated |
| .DMX | Valve | File video | Source Filmmaker Project File | Source Filmmaker | Valve |
| .DNC | Microsoft Corporation | File video | Windows Dancer File | Windows Media Center | Microsoft Corporation |
| .DPA | Serif | File video | DrawPlus Animation File | Serif DrawPlus | Serif |
| .DPD | David Pilling | File video | Ovation Pro File | Ovation Pro Reader | David Pilling |
| .DPG | Open Source | File video | Nintendo DS Movie File | MoonShell | Open Source |
| .DRC | Open Source | File video | Open Mobile Alliance DRM Rights Object | Microsoft Notepad | Microsoft Corporation |
| .DREAM | Stardock Corporation | File video | Dream Animated Wallpaper File | DreamMaker | Stardock Corporation |
| .DRT | Micrografx | File video | Micrografix Windows Draw Template File | Micrografix Windows Draw | Micrografx |
| .DSL | ABBYY | File video | Lingvo Dictionary Data File | ABBYY Lingvo Dictionary | ABBYY |
| .DSY | Lead System (M) Sdn. Bhd. | File video | Besta Video File | Besta Electronic Dictionaries | Lead System (M) Sdn. Bhd. |
| .DTCP-IP | Microsoft Corporation | File video | Microsoft Windows Movie Maker Video | Microsoft Windows Live Movie Maker | Microsoft Corporation |
| .DTV | Interscape | File video | DVD2AVI Mpeg2 File | DVD2AVI | Interscape |
| .DV | Roxio | File video | Digital Video File | Microsoft Windows Live Movie Maker | Microsoft Corporation |
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