| .4DX | 4D, Inc | Plug-in-filer | 4th Dimension Plugin File | 4D | 4D, Inc |
| .8BE | Adobe Systems Incorporated | Plug-in-filer | Adobe Photoshop Plug-in Filter | Adobe Photoshop | Adobe Systems Incorporated |
| .8BF | Adobe Systems Incorporated | Plug-in-filer | Photoshop Filter Plug-in | Adobe Illustrator CC | Adobe Systems Incorporated |
| .8BI | Corel | Plug-in-filer | Photoshop Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8BI8 | Adobe Systems Incorporated | Plug-in-filer | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BP | Adobe Systems Incorporated | Plug-in-filer | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BS | Adobe Systems Incorporated | Plug-in-filer | Photoshop 5.0 Selection Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8BX | Adobe Systems Incorporated | Plug-in-filer | PhotoDeluxe Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8BY | Adobe Systems Incorporated | Plug-in-filer | PhotoDeluxe Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .8LI | Adobe Systems Incorporated | Plug-in-filer | Photoshop Scripting Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .8LY | Corel | Plug-in-filer | Photoshop Plug-in | Adobe Photoshop Elements | Adobe Systems Incorporated |
| .8TY | Adobe Systems Incorporated | Plug-in-filer | Adobe Photoshop File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .AAUI | Adobe Systems Incorporated | Plug-in-filer | Acrobat User Interface File | Adobe Acrobat DC | Adobe Systems Incorporated |
| .AAXPLUGIN | Avid Technology | Plug-in-filer | Pro Tools Audio Plugin | Avid Pro Tools | Avid Technology |
| .ABA | Palm | Plug-in-filer | Palm Address Book Archive | Palm Desktop | Palm |
| .ABD | Interscape | Plug-in-filer | Adventure Builder Data | Adventure Builder | Interscape |
| .ABI | Thomas Hall | Plug-in-filer | DNA Chromatogram File | Heracle BioSoft DNA Baser Sequence Assembler | Heracle BioSoft |
| .ACCDA | Microsoft Corporation | Plug-in-filer | Access Add-in File | Microsoft Access | Microsoft Corporation |
| .ACK | Adobe Systems Incorporated | Plug-in-filer | Swifty Data | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .ADDIN | Microsoft Corporation | Plug-in-filer | Microsoft Visual Studio Add-in | Microsoft Visual Studio | Microsoft Corporation |
| .ADIUMPLUGIN | Adam Iser | Plug-in-filer | Adium Plugin File | Adium | Open Source |
| .ADN | Microsoft Corporation | Plug-in-filer | Access Blank Project Template | Microsoft Access | Microsoft Corporation |
| .AEX | Adobe Systems Incorporated | Plug-in-filer | After Effects Plug-in | Adobe After Effects | Adobe Systems Incorporated |
| .AHQ | Unknown Developer | Plug-in-filer | AudioHQ Plug-in Module | Unknown Software | Unknown Developer |
| .AIP | Adobe Systems Incorporated | Plug-in-filer | Illustrator Plug-in | Adobe Illustrator CC | Adobe Systems Incorporated |
| .ALP | AnyLogic | Plug-in-filer | AnyLogic Project File | AnyLogic | AnyLogic |
| .AMX | Valve | Plug-in-filer | AMX Mod Plugin File | Half-Life | Valve |
| .AMXX | Open Source | Plug-in-filer | AMX Mod X Plugin File | AMX Mod X | Open Source |
| .APD | ACD Systems | Plug-in-filer | ACDSee Photo Document | ACD Systems ACDSee | ACD Systems |
| .APE | Nullsoft | Plug-in-filer | AVS Plugin Effects File | Nullsoft Winamp | Nullsoft |
| .API | Adobe Systems Incorporated | Plug-in-filer | Adobe Photoshop Inks File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .APL | Matthew T. Ashland | Plug-in-filer | Monkey's Audio Track Information File | Microsoft Windows Media Player | Microsoft Corporation |
| .APP | Nokia | Plug-in-filer | Symbian OS Application | Symbian OS | Nokia |
| .ARX | Autodesk, Inc. | Plug-in-filer | AutoCAD Runtime Extension File | Autodesk AutoCAD | Autodesk, Inc. |
| .ASI | Borland | Plug-in-filer | ASsembler Include | Asi Loader | Interscape |
| .ATX | ESRI | Plug-in-filer | ArcGIS Attribute Index File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .AVX | Avid Technology | Plug-in-filer | Avid Plugin File | Avid Media Composer | Avid Technology |
| .AX | Open Source | Plug-in-filer | DirectShow Filter | Microsoft Windows Media Player | Microsoft Corporation |
| .BAI | B2W Software | Plug-in-filer | BUILD2WIN Add-in | BUILD2WIN | B2W Software |
| .BAV | Ritlabs, SRL | Plug-in-filer | AVG Bat! Plugin File | AVG Antivirus | AVG Technologies |
| .BIN | Unknown Developer | Plug-in-filer | Binary Disk Image File | IsoBuster | Smart Projects |
| .BKZ | NCH Software | Plug-in-filer | FileFort Backup File | NCH FileFort | NCH Software |
| .BLU | FileMaker Inc. | Plug-in-filer | FileMaker Pro Runtime Extension | FileMaker Pro | FileMaker Inc. |
| .BMI | Autodesk, Inc. | Plug-in-filer | 3D Studio Max Plugin | Autodesk 3ds Max | Autodesk, Inc. |
| .BRI | DAZ 3D | Plug-in-filer | Bryce Plug-in File | DAZ 3D Bryce | DAZ 3D |
| .BRM | DAZ 3D | Plug-in-filer | Bryce Plug-in File | DAZ 3D Bryce | DAZ 3D |
| .BUNDLE | Apple | Plug-in-filer | Mac OS X Application Bundle | macOS | Apple |
| .CCX | Clickteam | Plug-in-filer | Click & Create Extension | Multimedia Fusion | Interscape |
| .CDL | Kubotek Corporation | Plug-in-filer | CADKEY Wireframe Design File | CADKEY | Kubotek Corporation |
| .CMP | Microsoft Corporation | Plug-in-filer | Windows Connection Manager Profile | Microsoft Windows Server 2016 | Microsoft Corporation |
| .COX | Clickteam | Plug-in-filer | Click & Create Extension Object | Clickteam Fusion 2.5 | Clickteam |
| .CRX | Google | Plug-in-filer | Chrome Extension | 7-Zip | Igor Pavlov |
| .CST | Smith Micro Software | Plug-in-filer | Manga Studio Story File | Manga Studio | Smith Micro Software |
| .CVT | ACD Systems | Plug-in-filer | Canvas External Tool File | Canvas X | ACD Systems |
| .DBX | Microsoft Corporation | Plug-in-filer | Outlook Express E-mail Folder | Microsoft Outlook Express | Microsoft Corporation |
| .DFP | Blackmagic Design | Plug-in-filer | Fusion Plugin File | Fusion 9 | Blackmagic Design |
| .DKP | Dream Audio Tools | Plug-in-filer | Dreamkeys Plug-in | Dreamkeys | Dream Audio Tools |
| .DLC | JDownloader Team | Plug-in-filer | Download Link Container File | JDownloader | JDownloader Team |
| .DLM | AKAMAI | Plug-in-filer | Akamai Download Manager File | Akamai Download Manager | AKAMAI |
| .DLO | Autodesk, Inc. | Plug-in-filer | 3ds Max Plug-in | Autodesk 3ds Max | Autodesk, Inc. |
| .DLR | cebas Visual Technology | Plug-in-filer | FinalRender Plugin | cebas Visual Technology finalRender | cebas Visual Technology |
| .DLU | Autodesk, Inc. | Plug-in-filer | 3ds Max Utility Plug-in File | Autodesk 3ds Max | Autodesk, Inc. |
| .DMX | Valve | Plug-in-filer | Source Filmmaker Project File | Source Filmmaker | Valve |
| .DNS | 3D Realms | Plug-in-filer | Duke Nukem Forever Save File | Duke Nukem Forever | 3D Realms |
| .DPM | Avid Technology | Plug-in-filer | Pro Tools Plugin File | Avid Pro Tools | Avid Technology |
| .ECF | Microsoft Corporation | Plug-in-filer | Outlook Add-in | Microsoft Outlook | Microsoft Corporation |
| .EXT | Symantec Corporation | Plug-in-filer | Norton Commander Extension | Norton Commander | Symantec Corporation |
| .FFT | Adobe Systems Incorporated | Plug-in-filer | Adobe Audition Noise Print File | Adobe Audition | Adobe Systems Incorporated |
| .FLT | Presagis | Plug-in-filer | OpenFlight Scene Description File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .FMX | FileMaker Inc. | Plug-in-filer | FileMaker Plug-in | FileMaker Pro | FileMaker Inc. |
| .FPI | The Game Creators | Plug-in-filer | FPS Creator Intelligence Script | Dimenzo Text Editor | Dimenzo, Inc. |
| .FS | Microsoft Corporation | Plug-in-filer | Visual F# Source File | Microsoft Visual Studio | Microsoft Corporation |
| .FSB | AutoDesSys, Inc. | Plug-in-filer | Form•Z Compiled Script | AutoDesSys formZ | AutoDesSys, Inc. |
| .FXT | Rockstar Games | Plug-in-filer | Grand Theft Auto Fake Text File | Sanny Builder | Open Source |
| .FZIP | Foxit Software Inc. | Plug-in-filer | Foxit Reader Add-on | Foxit Reader | Foxit Software Inc. |
| .FZP | Interaction Design Lab Potsdam | Plug-in-filer | Fritzing Part File | Fritzing | Open Source |
| .GHOST | Open Source | Plug-in-filer | Ghost Inactive Mode File | Wrye Bash | Open Source |
| .IFB | Oracle Corporation | Plug-in-filer | Oracle Siebel Interface Configuration File | Siebel eBusiness | Oracle Corporation |
| .INFO | GNU Project | Plug-in-filer | Texinfo Document | GNU Emacs | GNU Project |
| .IOC | Radionomy | Plug-in-filer | Winamp Io Plugin | Nullsoft Winamp | Nullsoft |
| .IWZ | Flexera Software | Plug-in-filer | InstallShield Express 2 Project File | InstallShield | Flexera Software |
| .JIM | Atlassian | Plug-in-filer | JIRA Importers Plugin | JIRA | Atlassian |
| .KPR | Open Source | Plug-in-filer | KPresenter Presentation | KOffice | Open Source |
| .LAF | Kevin Yau | Plug-in-filer | Lingoes Appendix File | Lingoes | Kevin Yau |
| .LNG | Nullsoft | Plug-in-filer | Winamp Language File | Nullsoft Winamp | Nullsoft |
| .M2P | Moving Picture Experts Group | Plug-in-filer | MPEG-2 Program Stream File | Microsoft Windows Media Player | Microsoft Corporation |
| .M3P | Newfangled Solutions | Plug-in-filer | Mach3 Plugin File | Mach3 | Newfangled Solutions |
| .MAT | MathWorks | Plug-in-filer | MATLAB MAT-File | The MathWorks MATLAB | MathWorks |
| .MBZ | Unknown Developer | Plug-in-filer | Pogoshell NES Emulator Plugin | PogoShell | Unknown Developer |
| .MCH | Interscape | Plug-in-filer | Machinery HDR Effects | Machinery HDR | Interscape |
| .MDA | Microsoft Corporation | Plug-in-filer | Access Add-in File | Microsoft Access | Microsoft Corporation |
| .MDE | Microsoft Corporation | Plug-in-filer | Compiled Access Add-in File | Microsoft Access | Microsoft Corporation |
| .MENU | id Software | Plug-in-filer | Quake 3 Engine Menu File | Microsoft Notepad | Microsoft Corporation |
| .MEP | Movavi | Plug-in-filer | Movavi Video Editor Project | Movavi Video Editor | Movavi |
| .MFW | MamiyaLeaf | Plug-in-filer | Mamiya Camera Raw File | Adobe Photoshop CC | Adobe Systems Incorporated |
| .MFX | Clickteam | Plug-in-filer | Multimedia Fusion Extension | Clickteam Fusion 2.5 | Clickteam |
| .MILK | Nullsoft | Plug-in-filer | MilkDrop Winamp Plugin Preset | Nullsoft Winamp | Nullsoft |
| .MJP | LG Electronics | Plug-in-filer | MJPEG Video File | Apple QuickTime Player | Apple |
| .MLL | Autodesk, Inc. | Plug-in-filer | Autodesk Maya Plug-in | Autodesk Maya | Autodesk, Inc. |
| .MOD | Open Source | Plug-in-filer | Amiga Music Module File | ModPlug Player | Open Source |
af 3 
