| .MODULE | Open Source | Laajennustiedostot | Drupal Module File | Microsoft Notepad | Microsoft Corporation |
| .MTX | Yannick Delwiche | Laajennustiedostot | MadTracker 2 Extension | MadTracker 2 | Yannick Delwiche |
| .MXP | Adobe Systems Incorporated | Laajennustiedostot | Adobe Extension Package | Adobe Extension Manager CC | Adobe Systems Incorporated |
| .MXT | ESRI | Laajennustiedostot | ArcGIS Map Template | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .NBM | Oracle Corporation | Laajennustiedostot | NetBeans Module | NetBeans | Open Source |
| .NBP | Wolfram Research | Laajennustiedostot | Mathematica Player Notebook File | Wolfram Research Mathematica | Wolfram Research |
| .NET | Netviz LLC | Laajennustiedostot | NetViz Project File | netViz Enterprise software | Netviz LLC |
| .NFS | Codemasters | Laajennustiedostot | F1 2015 Speech Data | F1 2015 | Codemasters |
| .NVX | Noveltech | Laajennustiedostot | NvStructural Plug-in | nvStructural | Noveltech |
| .NW | GitHub, Inc. | Laajennustiedostot | Node-Webkit App Package | NW.js | GitHub, Inc. |
| .NXP | reFX | Laajennustiedostot | NEXUS Expansion Pack | NEXUS2 | reFX |
| .NY | SourceForge | Laajennustiedostot | Audacity Nyquist Plug-in | Audacity | Open Source |
| .OIV | Open Source | Laajennustiedostot | OpenIV Mod Package File | OpenIV | Open Source |
| .OXT | Sun Microsystems | Laajennustiedostot | Apache OpenOffice Extension | Apache OpenOffice | Apache Software Foundation |
| .P | Python Software Foundation | Laajennustiedostot | Python Pickle File | Python pickle | Python Software Foundation |
| .PBA | Oracle Corporation | Laajennustiedostot | OpenOffice.org Basic Protected Module File | Apache OpenOffice | Apache Software Foundation |
| .PE | Microsoft Corporation | Laajennustiedostot | Portable Executable File | Microsoft Windows | Microsoft Corporation |
| .PFL | PlotSoft | Laajennustiedostot | PDFill Project File | PlotSoft PDFill | PlotSoft |
| .PIM | Avid Technology | Laajennustiedostot | Pro Tools Controller Plug-in Mappings File | Avid Pro Tools | Avid Technology |
| .PKP | Microsoft Corporation | Laajennustiedostot | Visual Studio Packaging Project | Microsoft Visual Studio | Microsoft Corporation |
| .PL1 | Broderbund | Laajennustiedostot | 3D Home Architect Room Plan | 3D Home Architect | Broderbund |
| .PLG | Microsoft Corporation | Laajennustiedostot | Visual Studio Build Log File | Microsoft Visual Studio | Microsoft Corporation |
| .PLUGIN | Adobe Systems Incorporated | Laajennustiedostot | Adobe Photoshop Plugin | Adobe Photoshop | Adobe Systems Incorporated |
| .PLW | Hex-Rays | Laajennustiedostot | 32-bit Windows IDA Plugin Module | Hex-Rays IDA | Hex-Rays |
| .PLX | ActiveState | Laajennustiedostot | Perl Executable File | BBEdit | Bare Bones Software |
| .PPA | Microsoft Corporation | Laajennustiedostot | PowerPoint Add-in | Microsoft PowerPoint | Microsoft Corporation |
| .PPAM | Microsoft Corporation | Laajennustiedostot | PowerPoint 2007 Add-In | Microsoft Powerpoint 2016 | Microsoft Corporation |
| .PPM | The GIMP Development Team | Laajennustiedostot | Portable Pixmap Image File | Adobe Photoshop | Adobe Systems Incorporated |
| .PRM | Unknown Developer | Laajennustiedostot | Parameter File | GSAS | National Institute of Standards and Technology (NIST) |
| .PSET | Adobe Systems Incorporated | Laajennustiedostot | Adobe InDesign Plug-in Set File | Adobe InDesign | Adobe Systems Incorporated |
| .Q1Q | Flaming Pear Software | Laajennustiedostot | LunarCell Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q2Q | Flaming Pear Software | Laajennustiedostot | Flexify Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q2RENDERER | id Software | Laajennustiedostot | Quake 2 For Mac Renderer Plugin File | Quake II | id Software |
| .Q4Q | Flaming Pear Software | Laajennustiedostot | Solar Cell Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q7Q | Corel | Laajennustiedostot | India Ink Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q8R | Flaming Pear Software | Laajennustiedostot | Flood Photoshop Plug-in | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q9R | Flaming Pear Software | Laajennustiedostot | Glitterato Photoshop Plug-In | Adobe Photoshop CC | Adobe Systems Incorporated |
| .Q9S | Flaming Pear Software | Laajennustiedostot | Mr. Contrast Photoshop Plug-In | Adobe Photoshop | Adobe Systems Incorporated |
| .QAM | Omnis Software | Laajennustiedostot | Omnis Studio Audio Data | Omnis Studio | Omnis Software |
| .QAR | Qlik | Laajennustiedostot | QlikView Extension | QlikTech International QlikView | Qlik |
| .QLGENERATOR | Apple | Laajennustiedostot | Apple Quick Look Plug-in | Quick Look | Apple |
| .QPD | Quicken | Laajennustiedostot | Quicken QuickPay Windows 3.0 Add-on | Intuit Quicken | Quicken |
| .QPX | Microsoft Corporation | Laajennustiedostot | FoxPro Compiled Query Program | Microsoft Visual FoxPro | Microsoft Corporation |
| .QSF | Qualtrics | Laajennustiedostot | Qualtrics Survey File | Qualtrics Survey Solutions (online) | Qualtrics |
| .QTR | Apple | Laajennustiedostot | QuickTime Extension Resource | Apple QuickTime Player | Apple |
| .QTX | Apple | Laajennustiedostot | QuickTime Extension File | Apple QuickTime Player | Apple |
| .RB | Larian Studios | Laajennustiedostot | Divinity: Original Sin Game Data | Divinity: Original Sin | Larian Studios |
| .RBZ | Trimble Inc. | Laajennustiedostot | SketchUp Plugin | SketchUp | Trimble Inc. |
| .REV | Eugene Roshal | Laajennustiedostot | RAR Recovery Volume Set | WinRAR | Eugene Roshal |
| .RHI | McNeel | Laajennustiedostot | Rhino Installer Engine Package | McNeel Rhino | McNeel |
| .RHP | McNeel | Laajennustiedostot | Rhino Plug-in | McNeel Rhino | McNeel |
| .RPLN | Adobe Systems Incorporated | Laajennustiedostot | InDesign Required Plug-in File | Adobe InDesign | Adobe Systems Incorporated |
| .RPM | Red Hat | Laajennustiedostot | Red Hat Package Manager File | Red Hat Package Manager | Open Source |
| .RWT | International Reading Association | Laajennustiedostot | ReadWriteThink Timeline | International Reading Association RWT Timeline | International Reading Association |
| .SCM | Gimpel Software | Laajennustiedostot | GIMP Script-Fu Script | GIMP | The GIMP Development Team |
| .SMS | Sega | Laajennustiedostot | Sega Master System ROM | Kega Fusion | Steve Snake |
| .SPARC | Skype Technologies | Laajennustiedostot | Skype Plugin Archive | Skype | Skype Technologies |
| .SPD | AutoDesSys, Inc. | Laajennustiedostot | Form-Z Suspended Render Data | AutoDesSys formZ | AutoDesSys, Inc. |
| .SPE | IBM | Laajennustiedostot | SPSS Extension | IBM SPSS | IBM |
| .STD | Oracle Corporation | Laajennustiedostot | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .SUBLIME-PACKAGE | Sublime HQ Pty Ltd | Laajennustiedostot | Sublime Text Compressed Extension Package | Sublime Text | Sublime HQ Pty Ltd |
| .SVP | SwiftView, Inc. | Laajennustiedostot | SwiftView Command File | SwiftView | SwiftView, Inc. |
| .SYN | Image-Line | Laajennustiedostot | SimSynth Document | FL Studio 12 | Image-Line |
| .T3X | TYPO3 Association | Laajennustiedostot | TYPO3 Compressed Extension | TYPO3 | TYPO3 Association |
| .TBP | Trimble Inc. | Laajennustiedostot | Tekla BIMsight Project | Tekla Structures BIM software | Trimble Inc. |
| .TGP | Planetside Software | Laajennustiedostot | Terragen Plugin | Planetside Software Terragen | Planetside Software |
| .TKO | Harman International Industries | Laajennustiedostot | AMX Software Module File | TPDesign4 | Harman International Industries |
| .TPI | Thomson Reuters Corporation | Laajennustiedostot | EDIUS Plugin File | Thomson EDIUS | Grass Valley |
| .TRB | Hash | Laajennustiedostot | Animation Master Turbulence Plug-in | Animation:Master | Hash |
| .TS3_PLUGIN | TeamSpeak Systems | Laajennustiedostot | TeamSpeak 3 Plugin | TeamSpeak | TeamSpeak Systems |
| .UPC | J-T-L Development Inc. | Laajennustiedostot | Ultimate Paint Component File | Ultimate Paint | J-T-L Development Inc. |
| .VDF | Valve | Laajennustiedostot | Valve Data File | Microsoft Notepad | Microsoft Corporation |
| .VFP | Pegasys | Laajennustiedostot | TMPGEnc VFAPI Plug-in | TMPGEnc | Pegasys |
| .VPG | Interscape | Laajennustiedostot | VAKCER Project Tracker DLL Plug-in | VAKCER Project Tracker | Interscape |
| .VSIX | Microsoft Corporation | Laajennustiedostot | Visual Studio Extension | Microsoft Visual Studio | Microsoft Corporation |
| .VST | Microsoft Corporation | Laajennustiedostot | Targa Bitmap Image File | Adobe Illustrator CC | Adobe Systems Incorporated |
| .VST3 | Steinberg | Laajennustiedostot | Cubase Plugin | Steinberg Cubase | Steinberg |
| .VWP | Raven software | Laajennustiedostot | Vehicle Weapon File | Raven Software Star Wars Jedi Knight: Jedi Academy | Valve |
| .WBM | Jamie Cameron | Laajennustiedostot | Webmin Module | Webmin | Jamie Cameron |
| .WCX | Microsoft Corporation | Laajennustiedostot | RemoteApp And Desktop Connections Configuration File | Remote Desktop Manager | Devolutions |
| .WLL | Electronic Arts | Laajennustiedostot | The Sims Wall Texture File Format | The Sims | Electronic Arts |
| .WLZ | Gilles Vollant | Laajennustiedostot | WinImage Compressed Disk Image | Gilles Vollant WinImage | Gilles Vollant |
| .WPR | Apple | Laajennustiedostot | Apple Logic Studio WaveBurner Plug-in Preset File | Logic Pro X | Apple |
| .WWL | Microsoft Corporation | Laajennustiedostot | Microsoft Word Add-in File | Microsoft Word | Microsoft Corporation |
| .X32 | Adobe Systems Incorporated | Laajennustiedostot | Adobe Xtra File | Adobe Director | Adobe Systems Incorporated |
| .XBA | Oracle Corporation | Laajennustiedostot | OpenOffice.org Basic Module File | Apache OpenOffice | Apache Software Foundation |
| .XCPLUGIN | Apple | Laajennustiedostot | Xcode Plugin | Apple Xcode | Apple |
| .XEO | Signwave UK | Laajennustiedostot | Signwave Auto-Illustrator Plugin | Signwave Auto-Illustrator | Signwave UK |
| .XGO | GeoConcept SA | Laajennustiedostot | GeoConcept Add-on | GeoConcept | GeoConcept SA |
| .XLA | Microsoft Corporation | Laajennustiedostot | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
| .XLAM | Microsoft Corporation | Laajennustiedostot | Excel Open XML Macro-Enabled Add-In | Microsoft Excel | Microsoft Corporation |
| .XLL | Microsoft Corporation | Laajennustiedostot | Excel Add-In File | Microsoft Excel | Microsoft Corporation |
| .XLX | Interscape | Laajennustiedostot | XoloX Incomplete Download File | XoloX | Interscape |
| .XMD | Bitdefender | Laajennustiedostot | Bitdefender Plugin File | Bitdefender Total Security 2018 | Bitdefender |
| .XPI | Mozilla | Laajennustiedostot | Mozilla Installer Package | Mozilla Firefox | Mozilla |
| .XPL | Interscape | Laajennustiedostot | LcdStudio Playlist File | LCDStudio | Interscape |
| .XPT | Mozilla | Laajennustiedostot | Mozilla Firefox Component | Mozilla Firefox | Mozilla |
| .XRS | RealNetworks | Laajennustiedostot | Real Player External Resource | RealPlayer | Realtime Technologies |
| .XYZ | SourceForge | Laajennustiedostot | Molecule Specification File | Avogadro | Open Source |
| .ZLB | AutoDesSys, Inc. | Laajennustiedostot | Form•Z Symbol Library File | AutoDesSys formZ | AutoDesSys, Inc. |
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