| Extension Abbreviation | Extension Full name | How to open the File Extension |
|---|---|---|
| .u | Unreal Tournament Class Package | How to open .u file |
| .u10 | UFile 2010 Tax Return | How to open .u10 file |
| .u11 | UFile 2011 Tax Return | How to open .u11 file |
| .u12 | UFile 2012 Tax Return | How to open .u12 file |
| .u3d | Universal 3D File | How to open .u3d file |
| .u3i | U3 Application Information File | How to open .u3i file |
| .u3p | U3 Smart Application | How to open .u3p file |
| .u8 | 3D Lemmings Audio File | How to open .u8 file |
| .uasset | Unreal Asset File | How to open .uasset file |
| .uax | Unreal Audio Package | How to open .uax file |
| .ub | Unsigned Byte Audio File | How to open .ub file |
| .ubj | Universal Binary JSON File | How to open .ubj file |
| .ubox | Universe Sandbox Data File | How to open .ubox file |
| .ubz | OpenBoard Document | How to open .ubz file |
| .uc | UnrealScript Class | How to open .uc file |
| .uc2 | UltraCompressor 2 Archive | How to open .uc2 file |
| .uccapilog | Microsoft UCC API Log File | How to open .uccapilog file |
| .uce | Windows UCE System File | How to open .uce file |
| .ucf | WebEx Media File | How to open .ucf file |
| .uci | UFS Explorer Backup File | How to open .uci file |
| .ucl | Killing Floor System File | How to open .ucl file |
| .ucm | Crazy Machines Model File | How to open .ucm file |
| .uct | UC Browser Theme File | How to open .uct file |
| .ud | OmniPage User Dictionary | How to open .ud file |
| .udb | Dynamics AX User Database File | How to open .udb file |
| .udc | Adobe InDesign User Dictionary | How to open .udc file |
| .udcx | Universal Data Connection File | How to open .udcx file |
| .udeb | Debian Package File | How to open .udeb file |
| .udf | Universal Disk Format File | How to open .udf file |
| .udf | Microsoft Excel User-defined Function | How to open .udf file |
| .udl | Microsoft Universal Data Link File | How to open .udl file |
| .uds | Sierra Generations File | How to open .uds file |
| .uds | NetBackup UNIX Domain Socket File | How to open .uds file |
| .uds | Uniform Data System File | How to open .uds file |
| .uea | Protector Suite QL Encrypted Archive | How to open .uea file |
| .uf2 | USB Flashing Format | How to open .uf2 file |
| .ufo | Ulead File Object | How to open .ufo file |
| .ufo | Unified Font Object File | How to open .ufo file |
| .ufr | Ultra Fractal File | How to open .ufr file |
| .ufr | Upfiring File | How to open .ufr file |
| .ufs | FreeBSD Unix File System File | How to open .ufs file |
| .ufs.uzip | Compressed Unix File System File | How to open .ufs.uzip file |
| .uft | Torque Font Cache File | How to open .uft file |
| .uga | Ulead GIF Animator File | How to open .uga file |
| .ugoira | Ugoira Animated Image File | How to open .ugoira file |
| .ugr | Apophysis Ultra Fractal Gradient File | How to open .ugr file |
| .uha | UHarc Compressed Archive | How to open .uha file |
| .uhtml | UC Browser Saved Webpage | How to open .uhtml file |
| .ui | User Interface File | How to open .ui file |
| .uibak | UltraISO Backup Disk Image | How to open .uibak file |
| .uif | Universal Image Format Disc Image | How to open .uif file |
| .uis | WindowBlinds User Interface Specification | How to open .uis file |
| .ukx | Unreal Animation Package | How to open .ukx file |
| .ulaw | Raw u-Law Audio File | How to open .ulaw file |
| .uld | Unified Luminaire Data File | How to open .uld file |
| .ulf | Universal List File | How to open .ulf file |
| .ulp | EAGLE User Language Program | How to open .ulp file |
| .uls | NetMeeting User Location Service File | How to open .uls file |
| .ult | UltraTracker Module | How to open .ult file |
| .ulw | u-Law Audio File | How to open .ulw file |
| .ulx | Glulx Game File | How to open .ulx file |
| .ulz | USBlyzer Data Capture File | How to open .ulz file |
| .umap | Unreal Engine Map File | How to open .umap file |
| .umd | Splinter Cell Blacklist Game Data File | How to open .umd file |
| .umf | MediaHolder Universal Media Format File | How to open .umf file |
| .uml | UML Data Object Model | How to open .uml file |
| .umlclass | UML Class Model | How to open .umlclass file |
| .umod | Unreal Tournament Module File | How to open .umod file |
| .ums | Rune 3D Mesh File | How to open .ums file |
| .umx | Unreal Music Package | How to open .umx file |
| .unauth | SiteMinder Unauthorized Message File | How to open .unauth file |
| .unf | UNIF ROM File | How to open .unf file |
| .uni | MikMod UniMOD Module | How to open .uni file |
| .unif | UNIF ROM File | How to open .unif file |
| .unity | Unity Scene File | How to open .unity file |
| .unity3d | Unity Web Player Archive | How to open .unity3d file |
| .unitypackage | Unity Package File | How to open .unitypackage file |
| .unityproj | Unity 3D Project | How to open .unityproj file |
| .unk | Unknown File | How to open .unk file |
| .unknown | Unknown File Type | How to open .unknown file |
| .unl | Garmin Unlock File | How to open .unl file |
| .unr | Unreal Level Map | How to open .unr file |
| .unt | AutoCAD Unit Definition File | How to open .unt file |
| .unx | Unix Text File | How to open .unx file |
| .uof | Uniform Office Document | How to open .uof file |
| .uop | Uniform Office Presentation | How to open .uop file |
| .uop | Ultima Online Patch File | How to open .uop file |
| .uos | Uniform Office Spreadsheet | How to open .uos file |
| .uot | Uniform Office Document | How to open .uot file |
| .upd | Program Update Information | How to open .upd file |
| .update | ISAPI Update File | How to open .update file |
| .updatr | iConomy Update File | How to open .updatr file |
| .upf | MicroStation User Preferences File | How to open .upf file |
| .upf | Unified Power Format File | How to open .upf file |
| .upf | Panono Unstitched Panorama Format | How to open .upf file |
| .upg | Upgrade File | How to open .upg file |
| .upoi | iGO Points of Interest File | How to open .upoi file |
| .upr | Fractal Parameters File | How to open .upr file |
| .upr | FileMaker User Dictionary | How to open .upr file |
| .ups | UPS Patch File | How to open .ups file |
| .upx | Ultimate Packer for eXecutables File | How to open .upx file |
| .uqm | The Ur-Quan Masters Game Data File | How to open .uqm file |
| .urcl | URCL Assembly Source Code File | How to open .urcl file |
| .url | Internet Shortcut | How to open .url file |
| .urr | Uniface Signatures File | How to open .urr file |
| .urt | Utah Raster Toolkit File | How to open .urt file |
| .usa | Unreal Saved Game File | How to open .usa file |
| .usd | Universal Scene Description Format | How to open .usd file |
| .usdz | Universal Scene Description Zipped Format | How to open .usdz file |
| .useq | USeq Genome Data File | How to open .useq file |
| .user | Visual Studio Project User Options File | How to open .user file |
| .userprofile | Norton AntiVirus User Profile File | How to open .userprofile file |
| .usertile-ms | Windows 8 User Tile File | How to open .usertile-ms file |
| .usf | EVGA Precision X Skin File | How to open .usf file |
| .usflib | Nintendo 64 Song Library | How to open .usflib file |
| .usm | USM Game Video File | How to open .usm file |
| .usr | SmartMusic Custom File | How to open .usr file |
| .usr | FileMaker Pro Database File | How to open .usr file |
| .usr | Lowrance GPS Data File | How to open .usr file |
| .ust | UTAU Sequence Text File | How to open .ust file |
| .ustar | Uniform Standard Tape Archive Format File | How to open .ustar file |
| .usx | Unreal Static Meshes | How to open .usx file |
| .ut2 | Unreal Tournament Map | How to open .ut2 file |
| .ut2mod | Unreal Tournament 2003/2004 Module File | How to open .ut2mod file |
| .ut3 | Unreal Tournament 3 Map File | How to open .ut3 file |
| .ut4mod | Unreal Tournament 2004 Module | How to open .ut4mod file |
| .ut8 | Ghost Master Language File | How to open .ut8 file |
| .utc | Bioware Creature File | How to open .utc file |
| .utf8 | Unicode UTF8-Encoded Text Document | How to open .utf8 file |
| .utm | UTM Virtual Machine | How to open .utm file |
| .utw | Unity Whirld File | How to open .utw file |
| .utx | Unreal Texture Package | How to open .utx file |
| .utxt | Unicode Text File | How to open .utxt file |
| .utz | UIQ Theme Package | How to open .utz file |
| .uu | Uuencoded File | How to open .uu file |
| .uud | UUDecoded File | How to open .uud file |
| .uue | Uuencoded File | How to open .uue file |
| .uvf | Uncertain Value Format | How to open .uvf file |
| .uvm | UnitVM Executable File | How to open .uvm file |
| .uvw | UVW Coordinates File | How to open .uvw file |
| .uvx | Unreal Tournament 2003 Saved Game | How to open .uvx file |
| .uw | Unsigned Word Audio File | How to open .uw file |
| .uwf | UltraTracker Wave File | How to open .uwf file |
| .uwl | User Word List File | How to open .uwl file |
| .uwrf | Universal Web Radio File | How to open .uwrf file |
| .uxf | UML eXchange Format | How to open .uxf file |
| .uxx | Unreal Tournament Cache | How to open .uxx file |
| .uzed | Zipped Unicode GEDCOM Genealogy File | How to open .uzed file |
| .uzip | FreeBSD Compressed Disk Image | How to open .uzip file |
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