| uhtml | uHTML Document |
| ui | QT User Interface File |
| uic | Aveva CAF User Interface Customization File |
| uic | COCO Unit ICon File |
| uih | Geoworks UI Compiler Espire Header |
| uir | NI LabWindows User Interface Resource File |
| uit | UIX XML Page Template |
| uitest | Microsoft Visual Studio UI Test Data |
| uix | UIX XML Page |
| ulb | COBOL Unisys Library File |
| ulc | RevaSoft ULC Application |
| ulp | EAGLE User Language Program |
| um2 | Crestron SIMPL User Module Backup |
| umc | Crestron SIMPL User Module |
| uml | StarUML v1 Model Data |
| uml | Unified Modeling Language File |
| umlclass | Eclipse IDE UML Class Data |
| umlf | StarUML UML Fragment Data |
| upkg | Unreal Enigine Package Flags |
| upo | DBase Compiled Update Data |
| uptnl | Unreal Engine Bulk Payload Data |
| ur | Ur Source Code |
| urcl | URCL Assembly Source Code |
| urf | ProWorx NXT User Configurable Register Editor Data |
| urf | Xilinx ISE User-specified Rules Data |
| urp | Universal Report Document |
| urr | Uniface Runtime Repository |
| urs | Ur Signature |
| user | Visual Studio Project User Options Data |
| ush | Crestron SIMPL CNX Compile |
| usi | UsiXML UI Description Data |
| uskn | KSDev ThemeEngine Theme |
| usl | ProWorx NXT USL Loadable |
| usp | Crestron SIMPL+ User Module Source |
| usp | Uniface Server Page |
| uwc | Laird smartBASIC Compiled Bytecode |
| uxo | RapidPLUS XML User Defined Object |
| v | Coq Source Code |
| v | ReaGeniX Consistency Check Data |
| v | V++ VPascal Source Code |
| v | Verilog HDL Source |
| v18 | SYNETSIM QuickBasic Source Code |
| v2z | TI Voyage 200 Assembly Program |
| v3s | Visual3D Pipeline |
| v4p | VVVV Patchlet |
| val | dBASE Values List Data |
| vala | Vala Source Code File |
| vam | Microsoft Visual Studio vAnalyzer Item Data |
| var | WebHub Web Session Data |
| vb | Visual Basic Project Item |
| vbadoc | Project Analyzer Document |
| vbat | Visual Batch Script |
| vbfrm | Visual Batch Form Data |
| vbg | Visual Basic Project Group |
| vbhtml | Razor VB Web Page |
| vbhtml | Visual Studio ASP.NET Web Page |
| vbi | IntelliCAD VBA Script |
| vbi | Visual Batch Include |
| vbl | Visual Basic Control Licensing File |
| vbor | V IDE Automatically Generated MakeFile |
| vbprj | VBatch-IDE Project |
| vbr | Visual Basic Remote Automation Registration |
| vbsa | NI Analysis Server Script |
| vbscript | Visual Basic Script |
| vbw | Visual Basic Project Workspace |
| vbx | Visual Basic Custom Control |
| vbz | Visual Basic Wizard Launch File |
| vc1 | Visual Studio Visual C Makefile |
| vc15 | Visual Studio Visual C 1.5 Makefile |
| vc4 | Visual C++ Makefile |
| vch | Vocola Include File |
| vcl | Vocola Source Code |
| vcprops | Microsoft Visual Studio 2008 Property Sheet Data |
| vcs | Valve Source Engine Shader |
| vct | Visual FoxPro Class Library Memo |
| vcwin32 | Visual Studio Visual C Win32 Makefile |
| vcx | Visual FoxPro Class Library |
| vcxitems | Visual Studio C++ Project Items Data |
| vdex | Android VDEX Container |
| vdm | VDM Source Code |
| vdt | VersaPro Variable Declaration Table |
| ved | Visionaire Studio Data |
| vedef | ArchestrA Symbols Reference Data |
| vert | QT Vertex Shader |
| vew | CA-Clipper View Data |
| vf | Xilinx ISE Verilog Source Code |
| vfl | Houdini 3D VEX Shader Source |
| vfr | UEFI VFR Code |
| vgc | ViziGen Code Generation Template |
| vgdb | V IDE DB MakeFile |
| vgendll | V IDE Automatically Generated DLL MakeFile |
| vgui | V IDE GUI MakeFile |
| vguidb | V IDE GUI DB MakeFile |
| vh | WinHelp VH Data |
| vha | Xilinx ISE VHDL Test Bench |
| vhdl | VHSIC Hardware Description Language Document |
| vhf | Xilinx ISE VHDL Source Code |
| vhi | VHDL Template |
| vho | Altera Quartus II VHDL Output File |
| vho | Xilinx VHDL Instantiation Template |
| vhtml | VITRAGE Source Code |
| vi | LabVIEW Virtual Instrument |
| vi2 | ComSoft Basic File |
| via | ARM Compiler VIA Data |
| vib | LithTech Video Data |
| vic | ViziGen Code Import Mappings Data |
| vidx | CMSIS Pack Vendor Index |
| vio | Coq Intermediate Object |
| viw | Visual Database Tools View Script |
| vix | ACUCOBOL-GT Index |
| vjb | Visustin Job Data |
| vjl | Visual J# Source Code |
| vjs | PlanetPress Connect Virtual Javascript |
| vlc | ACUCOBOL-GT License |
| vlib | Verilog Library |
| vls | Visual Localize Script |
| vlx | AutoLISP Visual LISP Executable |
| vm | Velocity Macro File |
| vm6 | Xilinx ISE CPLDFit Output Data |
| vmt | Valve Source Material Data |
| vmx | Valve Source Map Backup |
| vne | VPLus Native Platform Executable |
| vnl | Virtual NanoLab Script |
| vnm | VenomIDE Venom Source Code |
| vns | Visual Net Server File |
| vo | Coq Compiled Object |
| voc | Mizar Vocabulary File |
| vof | VZ Programmer Object Folder |
| vp | Justinmind Prototype Data |
| vp | Xilinx ISE Encrypted Verilog Code |
| vpc | ViziGen Project Configuration |
| vpi | Virtual Pascal OS/2 Unit |
| vpy | Vortex Python Script |
| vqm | Altera Quartus II Verilog Quartus Mapping Data |
| vqr | CodePainter Revolution Query Painter Query |
| vrm | Visual REXX Source Code |
| vscodeignore | Visual Studio Code Extension Ignore Data |
| vscontent | Visual Studio Content Data |
| vsct | Visual Studio Command Table |
| vsdisco | Visual Studio .NET Dynamic Discovery Data |
| vsglog | Visual Studio Graphics Diagnostics Tool Log |
| vsh | Microsoft DirectX D3D Vertex Shader |
| vsix | Visual Studio Extension Package |
| vsixlangpack | Visual Studio VSIX Language Package |
| vsixmanifest | Visual Studio VSIX Manifest Data |
| vsl | Velocity Style File |
| vsmacros | Visual Studio .NET Macros |
| vsmdi | Microsoft Visual Studio Test Metadata |
| vso | Microsoft DirectX D3D Compiled Vertex Shader |
| vsp | Visual Studio Profiling Data |
| vspf | Visual Studio Performance Filter |
| vspolicy | Visual Studio Policy Description Language Data |
| vspolicydef | Visual Studio Policy Definition Data |
| vsprops | Visual Studio Project Property Sheet |
| vsps | Visual Studio Serialized Performance Report |
| vspscc | Visual Studio Project Source Control |
| vspx | Visual Studio Profiling Report Data |
| vsscc | Visual Studio Solution Source Control Temporary File |
| vssscc | Visual Studio Solution Source Control |
| vstax | Visual Studio Tools for Applications Template |
| vstdir | Visual Studio Project Type Settings Data |
| vstemplate | Visual Studio Project Template Metadata |
| vsz | Visual Studio Wizard |
| vta | Valve Source Flex Animation Data |
| vtf | Valve Source Texture Data |
| vtk | ParaView VTK Data File |
| vtl | Velocity Template Language File |
| vtm | Visual Tool Markup Language Document |
| vtp | ParaView VTK Poly Data |
| vtr | ParaView VTK Rectilinear Grid |
| vts | ParaView VTK Structured Grid |
| vtu | ParaView VTK Unstructured Grid |
| vtx | Valve Source Mesh Strip Data |
| vue | dBASE IV View File |
| vue | FoxPro 2 View |
| vvd | Valve Source Model Vertex Data |
| vvp | Icarus Verilog Compiled Program |
| vvt | VersaPro Variable View Table |
| vwf | Altera Quartus II Vector Waveform File |
| vxc | Xilinx ISE Conformal-LEC Assertion Data |
| vxp | Maui Runtime Environment Application |
| vzt | Verilog Zipped Trace Data |
| w | OpenEdge ABL Procedure File |
| w3 | Milinta APL APL+Win Workspace |
| w32 | Win32 Makefile |
| wadcfg | Microsoft Azure Diagnostics Configuration Data |
| wam | WebAction Macro |
| wamb | WebDev Skin Data |
| wasm | WebAssembly Binary Code |
| wat | WebAssembly Textual Code |
| wbc | WinBatch Compiled WBT Script |
| wbc | WinDev Classes Data |
| wbe | WinDev Report Data |
| wbg | WinDev Procedures Data |
| wbm | WinBatch Macro |
| wbo | DataFlex Web Business Object |
| wbp | WinDev Project Identifiers Data |
| wbr | WinDev Request Identifiers Data |
| wbs | WebExpress Website Data |
| wbsp | WhizBase Server Page |
| wbt | WinBatch Script |
| wbw | WinDev Windows Identifiers Data |
| wcc | WinDev Class Compilation Data |
| wce | WinDev Report Compilation Data |
| wcg | WinDev Procedures Compilation Data |
| wci | WinDev Internal Components Data |
| wcp | WinDev Project Compilation Data |
| wcp_settings | Alpha Five Web Project Settings |
| wct | Visual Basic WebClass HTML Template |
| wcw | WinDev Windows Compilation Data |
| wda | WinDev Analysis Description |
| wdbatch | WinDev Batch File |
| wdc | WinDev Class Property Data |
| wdcoverage | WinDev Code Coverage Data |
| wde | WinDev Report File |
| wdf | Microsoft Windows Driver Foundation Data |
| wdf | WinDev Custom Installation Data |
| wdfab | WinDev Action Plan Library |
| wdg | WinDev Procedures |
| wdh | WinDev Help Description |
| wdi | WinDev Component Description |
| wdit | WinDev External Component Translation |
| wdk | WinDev Component |
| wdl | WinDev Library |
| wdm | Visual Interdev Web Project Items Data |
| wdm | WinDev WDINT Extraction File |
| wdo | WinDev Component List |
| wdr | WinDev Request Data |
| wdsc | WDScript Source Code |
| wdt | WinDev Template File |
| wdt | WinSQL Schema Diff Template |
| wdu | WinDev Library Components Data |
| wdump | WinDev Debug Dump Data |
| wdv | WinDev Conversion Data |
| wdw | WinDev Window File |
| wdy | WinDev Run-Time Template |
| web | CWEB Source Code |
| web | FWEB Source Code |
| webinfo | Visual Studio .NET Web Information Data |
| webmanifest | Progressive Web Application Manifest |
| webtemplate | iWeb Template |
| webtest | Microsoft Visual Studio WebTest Data |
| webtheme | iWeb Theme Template |
| wem | WinDev Flexible Model Data |
| wep | WinDev Compilation Error Data |
| wer | WinDev Replication Data |
| wer | WinSQL E/R Diagram |
| wet | WinSQL Export Template |
| wew | Debugging Tools for Windows Saved Workspace |
| wfk | Delphi Runimage WFK Data |