| .SGN | Signet Bureau | Ficheiros Gráficos | Signet Bureau DRM File | SGN Viewer | Signet Bureau |
| .SGR | Electronic Arts | Ficheiros Gráficos | SimCity 4 Graphics Rules File | Electronic Arts SimCity 4 | Electronic Arts |
| .SGV | Oracle Corporation | Ficheiros Gráficos | StarOffice StarDraw 2.0 Picture Image File | StarOffice | Oracle Corporation |
| .SHA | Corel | Ficheiros Gráficos | CorelDraw Shader File | CorelDRAW Graphics Suite | Corel |
| .SHO | Show Pro Software | Ficheiros Gráficos | Show Pro Show Flow File | Show Pro | Show Pro Software |
| .SIA | Nevercenter | Ficheiros Gráficos | Silo 3D Model File | Silo | Nevercenter |
| .SLB | Autodesk, Inc. | Ficheiros Gráficos | AutoCAD Slide Library | Autodesk AutoCAD | Autodesk, Inc. |
| .SLDLFP | Dassault Systèmes | Ficheiros Gráficos | SolidWorks Library Part | Dassault Systemes SolidWorks | Dassault Systèmes |
| .SLO | Pixar | Ficheiros Gráficos | RenderMan Compiled File | RenderMan | Pixar |
| .SLP | Magix Software GmbH | Ficheiros Gráficos | SpectraLayers Pro Project | SpectraLayers Pro | Magix Software GmbH |
| .SLT | Mozilla | Ficheiros Gráficos | Mozilla User Profile Folder | Mozilla Firefox | Mozilla |
| .SMG | Dassault Systèmes | Ficheiros Gráficos | 3DVia Composer Model | 3DVIA | Dassault Systèmes |
| .SMH | Oracle Corporation | Ficheiros Gráficos | Sealed MHT Document | Unsealer | Oracle Corporation |
| .SMI | Apple | Ficheiros Gráficos | Self-Mounting Disk Image | ShrinkWrap | Aladdin Systems |
| .SMIL | "Synchronized Multimedia" Working Group (SYMM WG) | Ficheiros Gráficos | SMIL(Synchronized Multimedia Integration Language) Presentation File | Internet Explorer | Microsoft Corporation |
| .SNA | Tom Ehlert Software | Ficheiros Gráficos | Drive Snapshot Primary Backup File | Tom Ehlert Drive Snapshot | Tom Ehlert Software |
| .SST | Microsoft Corporation | Ficheiros Gráficos | Serialized Certificate Store File | Certificate Manager Tool | Microsoft Corporation |
| .ST6 | XnSoft | Ficheiros Gráficos | SBIG CCD Camera Image | XnView MP | XnSoft |
| .ST7 | XnSoft | Ficheiros Gráficos | SBIG CCD Camera Image | XnView MP | XnSoft |
| .ST9 | XnSoft | Ficheiros Gráficos | SBIG CCD Camera Image | XnView MP | XnSoft |
| .STD | Oracle Corporation | Ficheiros Gráficos | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STM | Microsoft Corporation | Ficheiros Gráficos | Exchange Streaming Media File | Microsoft Exchange Server | Microsoft Corporation |
| .SWL | Macromedia | Ficheiros Gráficos | Alternate Macromedia Flash Format | Adobe Flash Player | Adobe Systems Incorporated |
| .SXO | Modular Dreams, Inc. | Ficheiros Gráficos | SX Paint Saved Graphical Working Environment | SX Paint | Modular Dreams, Inc. |
| .T2 | RM Education | Ficheiros Gráficos | Textease 2000 File | Textease 2000 | RM Education |
| .T2K | Basement.nl | Ficheiros Gráficos | Teach2000 Document | Teach2000 | Basement.nl |
| .T2W | Borland | Ficheiros Gráficos | NTgraph Turbo Pascal File | Turbo Pascal | Embarcadero Technologies |
| .TAP | Various Developers | Ficheiros Gráficos | Commodore 64 Cassette Tape Image | Fuse | Open Source |
| .TBF | Trellian Software | Ficheiros Gráficos | Trellian Button Factory File | Trellian Button Factory | Trellian Software |
| .TBT | ARRIS | Ficheiros Gráficos | Timbuktu Pro Remote Control Software File Format | Timbuktu | ARRIS |
| .TCA | Iota Software | Ficheiros Gráficos | The Complete Animator Animation | The Complete Animator | Iota Software |
| .TDI | Toshiba Corporation | Ficheiros Gráficos | Toshiba Disc Creator Image | Toshiba Disc Creator | Toshiba Corporation |
| .TEI | Image Systems | Ficheiros Gráficos | TrackEye Image Sequence File | TrackEye | Image Systems |
| .TER | Planetside Software | Ficheiros Gráficos | Terragen Terrain File | Planetside Software Terragen | Planetside Software |
| .TF | Borland | Ficheiros Gráficos | Turbo Profiler Configuration | Turbo Profiler | Borland |
| .TFF | Roland Kraft, Josef Kauer, Nikolaus Meier | Ficheiros Gráficos | IDOLON Tagged File Format | IDOLON | Roland Kraft, Josef Kauer, Nikolaus Meier |
| .THB | COMIRAM Innovation | Ficheiros Gráficos | KinuPix Skin | KinuPix | COMIRAM Innovation |
| .THL | Individual Software Inc. | Ficheiros Gráficos | Total 3D Home Design File | Total 3D Home Design Deluxe | Individual Software Inc. |
| .TR5 | Onyx Computing | Ficheiros Gráficos | OnyxTree Professional Data | OnyxTREE BROADLEAF | Onyx Computing |
| .TRI | Singular Inversions | Ficheiros Gráficos | FaceGen Polygonal Model File | The Elder Scrolls IV: Oblivion | Bethesda Softworks |
| .TSB | 3dMD | Ficheiros Gráficos | 3dMD Or 3Q Viewer 3D Image | 3dMD | 3dMD |
| .TUD | Cerious Software | Ficheiros Gráficos | ThumbsPlus Graphics File | ThumbsPlus | Cerious Software |
| .TUO | Cerious Software | Ficheiros Gráficos | ThumbsPlus Viewer Graphics | ThumbsPlus | Cerious Software |
| .TXM | CFP Software Limited | Ficheiros Gráficos | CFPwinMan Document File | CFPwinMan | CFP Software Limited |
| .TXS | Delphi Softwares | Ficheiros Gráficos | Beast (Trojan Horse) Data File | Beast (Trojan Horse) | Delphi Softwares |
| .UCD | Insoft Oy | Ficheiros Gráficos | Prosa Diagram | Prosa UML Modeller | Insoft Oy |
| .UCG | Corel Corporation | Ficheiros Gráficos | CG Infinity Graphic | Ulead MediaStudio | Corel |
| .UDI | Pinnacle Systems Inc. | Ficheiros Gráficos | Dazzle DVD Complete File | Dazzle DVD Complete | Pinnacle Systems Inc. |
| .UEZ | Ulead Systems | Ficheiros Gráficos | Ulead COOL 3D Image | MotionStudio 3D | Corel |
| .UOL | Ulead Systems | Ficheiros Gráficos | PhotoImpact Clipart Image | PhotoImpact | Corel |
| .UPI | Ulead Systems | Ficheiros Gráficos | Ulead PhotoImpact Plugin | Apple iPhoto | Apple |
| .UYVY | Pierre-Emmanuel Gougelet | Ficheiros Gráficos | YUV 16-Bit Image File | XnView MP | XnSoft |
| .V2D | Archway Systems | Ficheiros Gráficos | VersaCAD File | Archway Systems VersaCAD | Archway Systems |
| .V2I | Symantec Corporation | Ficheiros Gráficos | Norton Ghost Virtual Volume Image | Symantec Ghost Solution Suite | Symantec Corporation |
| .VAN | Hypercube, Inc. | Ficheiros Gráficos | Vista Pro Animation File | VistaPro | Hypercube, Inc. |
| .VC7 | LaVision | Ficheiros Gráficos | DaVis Graphics File | DaVis | LaVision |
| .VEP | Online Media Technologies Ltd. | Ficheiros Gráficos | AVS Video Editor Project File | AVS Video Editor | Online Media Technologies Ltd. |
| .VIEW | Rapidform, Inc. | Ficheiros Gráficos | GOM Atos Scanner File | Rapidform Explorer (Geomagic Verify Viewer) | Rapidform, Inc. |
| .VLM | Novell, Inc. | Ficheiros Gráficos | Novell Netware Virtual Loadable Module | NetWare | Novell, Inc. |
| .VSA | Symantec Corporation | Ficheiros Gráficos | Virtual Software Archive | Wise Package Studio | Symantec Corporation |
| .VSTM | Microsoft Corporation | Ficheiros Gráficos | Microsoft Visio 2013 Macro-enabled Template File | Microsoft Office | Microsoft Corporation |
| .VTA | Valve | Ficheiros Gráficos | Valve Face Flex File | Valve Source SDK | Valve |
| .VTK | Kitware, Inc. | Ficheiros Gráficos | Visualization Toolkit Legacy Data | Visualization ToolKit | Interscape |
| .VTP | Kitware, Inc. | Ficheiros Gráficos | Visualization Toolkit Polygonal Data | Visualization ToolKit | Interscape |
| .VTX | Richard Bannister | Ficheiros Gráficos | VTX Chiptune File | Audio Overload | Richard Bannister |
| .VWT | Sonic Solutions | Ficheiros Gráficos | MGI VideoWave Video Wave Thumbnail | VideoWave | Sonic Solutions |
| .WCD | Microsoft Corporation | Ficheiros Gráficos | Microsoft Works Calendar File | Microsoft Works | Microsoft Corporation |
| .WD | Corel Corporation | Ficheiros Gráficos | Corel PaintShop Photo Pro Image | PaintShop Pro | Corel |
| .WDR | Psion PLC | Ficheiros Gráficos | Psion Series 3 Printer Driver | Symbian OS | Nokia |
| .WEST POINT BRIDGE DESIGNER FILE | West Point | Ficheiros Gráficos | West Point Bridge Designer File | West Point Bridge Designer | Stephen Ressler |
| .WKF | KeyFocus | Ficheiros Gráficos | KF Web Server Default Control File | KF Web Server | KeyFocus |
| .WLT | Unknown Developer | Ficheiros Gráficos | WaveL Wavelet Compressed Graphic | Unknown Software | Unknown Developer |
| .WSQ | UTAU Team | Ficheiros Gráficos | UTAU File | UTAU | Vocal Synthesizer |
| .XEP | X-Genics Limited | Ficheiros Gráficos | eManager File Packaging Information | X-Genics eManager | X-Genics Limited |
| .XESC | Microsoft Corporation | Ficheiros Gráficos | Microsoft Expression Encoder Screen Capture Data | Microsoft Windows Media Player | Microsoft Corporation |
| .XIE | Microsoft Corporation | Ficheiros Gráficos | X Image Extension | X Window System | X.Org Foundation |
| .XOT | Xenetech | Ficheiros Gráficos | Xnetech Job Output File | Xenetech Graphic Workstation | Xenetech |
| .XPS | Microsoft Corporation | Ficheiros Gráficos | Microsoft XPS (XML Paper Specification) File | Nuance Power PDF Professional | Nuance |
| .XRL | SAP | Ficheiros Gráficos | PowerDesigner Report File | Sybase PowerDesigner | SAP |
| .XSS | Oracle Corporation | Ficheiros Gráficos | XML Style Sheet | Microsoft Visual Studio | Microsoft Corporation |
| .XXG | Brixx Software | Ficheiros Gráficos | Brixx Planner Graph File | Brixx | Brixx Software |
| .XXX | BloodDolly | Ficheiros Gráficos | TeslaCrypt 3.0 Ransomware Encrypted File | Tesla Decoder | BloodDolly |
| .XYD | Coopware | Ficheiros Gráficos | XYPad Drawing Document File | XYPad | Coopware |
| .XYZ | SourceForge | Ficheiros Gráficos | Molecule Specification File | Avogadro | Open Source |
| .YGF | yWorks | Ficheiros Gráficos | yWorks Binary Graph Format | yWorks yEd Graph Editor | yWorks |
| .YHF | HotBounce | Ficheiros Gráficos | Your Honey Frame Shape File | Your Honey Frame | HotBounce |
| .ZBR | Zoner Software | Ficheiros Gráficos | Zoner Zebra Metafile File | Zoner Photo Studio | Zoner Software |
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