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