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U นามสกุลไฟล์
| นามสกุลไฟล์ | ประเภทไฟล์ | 
|---|---|
| .U | Subsampled Raw YUV Image | 
| .U10 | UFile 2010 Tax Return | 
| .U11 | UFile 2011 Tax Return | 
| .U12 | UFile 2012 Tax Return | 
| .U3D | Universal 3D File | 
| .U3I | U3 Application Information File | 
| .U3P | U3 Smart Application | 
| .U8 | Mario Kart Wii Archive | 
| .UASSET | Unreal Asset File | 
| .UAX | Unreal Audio Package | 
| .UB | Unsigned Byte Audio File | 
| .UBJ | Universal Binary JSON File | 
| .UBOX | Universe Sandbox Data File | 
| .UC | UnrealScript Class | 
| .UC2 | UltraCompressor 2 Archive | 
| .UCCAPILOG | Microsoft UCC API Log File | 
| .UCE | Windows UCE System File | 
| .UCF | WebEx Media File | 
| .UCI | UFS Explorer Backup File | 
| .UCL | Killing Floor System File | 
| .UCM | Crazy Machines Model File | 
| .UCT | UC Browser Theme File | 
| .UD | OmniPage User Dictionary | 
| .UDB | Dynamics AX User Database File | 
| .UDC | Adobe InDesign User Dictionary | 
| .UDCX | Universal Data Connection File | 
| .UDEB | Debian Package File | 
| .UDF | Universal Disk Format File | 
| .UDK | Unreal Engine Map File | 
| .UDL | Microsoft Universal Data Link File | 
| .UDS | NetBackup UNIX Domain Socket File | 
| .UEA | Protector Suite QL Encrypted Archive | 
| .UFO | Unified Font Object File | 
| .UFR | Ultra Fractal File | 
| .UFS | FreeBSD Unix File System File | 
| .UFS.UZIP | Compressed Unix File System File | 
| .UFT | Torque Font Cache File | 
| .UGA | Ulead GIF Animator File | 
| .UGOIRA | Ugoira Animated Image File | 
| .UGR | Apophysis Ultra Fractal Gradient File | 
| .UHA | UHarc Compressed Archive | 
| .UHTML | UC Browser Saved Webpage | 
| .UI | User Interface File | 
| .UIBAK | UltraISO Backup Disk Image | 
| .UIF | Universal Image Format Disc Image | 
| .UIS | WindowBlinds User Interface Specification | 
| .UKX | Unreal Animation Package | 
| .ULAW | Raw u-Law Audio File | 
| .ULD | Unified Luminaire Data File | 
| .ULF | Universal List File | 
| .ULP | EAGLE User Language Program | 
| .ULS | NetMeeting User Location Service File | 
| .ULT | UltraTracker Module | 
| .ULW | u-Law Audio File | 
| .ULX | Glulx Game File | 
| .ULZ | USBlyzer Data Capture File | 
| .UMAP | Unreal Engine Map File | 
| .UMD | Splinter Cell Blacklist Game Data File | 
| .UMF | MediaHolder Universal Media Format File | 
| .UML | UML Data Object Model | 
| .UMLCLASS | UML Class Model | 
| .UMOD | Unreal Tournament Module File | 
| .UMS | Rune 3D Mesh File | 
| .UMX | Unreal Music Package | 
| .UNAUTH | SiteMinder Unauthorized Message File | 
| .UNF | UNIF ROM File | 
| .UNI | MikMod UniMOD Module | 
| .UNIF | UNIF ROM File | 
| .UNITY | Unity Scene File | 
| .UNITY3D | Unity Web Player Archive | 
| .UNITYPACKAGE | Unity Package File | 
| .UNITYPROJ | Unity 3D Project | 
| .UNK | Unknown File | 
| .UNKNOWN | Unknown | 
| .UNL | Garmin Unlock File | 
| .UNR | Unreal Level Map | 
| .UNT | AutoCAD Unit Definition File | 
| .UNX | Unix Text File | 
| .UOF | Uniform Office Document | 
| .UOP | Ultima Online Patch File | 
| .UOS | Uniform Office Spreadsheet | 
| .UOT | Uniform Office Document | 
| .UPD | Program Update Information | 
| .UPDATE | ISAPI Update File | 
| .UPDATR | iConomy Update File | 
| .UPF | MicroStation User Preferences File | 
| .UPG | Upgrade File | 
| .UPK | Unreal Engine 3 Package | 
| .UPOI | iGO Points of Interest File | 
| .UPR | FileMaker User Dictionary | 
| .UPS | UPS Patch File | 
| .UPX | Ultimate Packer for eXecutables File | 
| .UQM | The Ur-Quan Masters Game Data File | 
| .URL | Internet Shortcut | 
| .URR | Uniface Signatures File | 
| .URT | Utah Raster Toolkit File | 
| .USA | Unreal Saved Game File | 
| .USEQ | USeq Genome Data File | 
| .USER | Visual Studio Project User Options File | 
| .USERPROFILE | Norton AntiVirus User Profile File | 
| .USERTILE-MS | Windows 8 User Tile File | 
| .USF | EVGA Precision X Skin File | 
| .USFLIB | Nintendo 64 Song Library | 
| .USM | USM Game Video File | 
| .USR | Lowrance GPS Data File | 
| .UST | UTAU Sequence Text File | 
| .USTAR | Uniform Standard Tape Archive Format File | 
| .USX | Unreal Static Meshes | 
| .UT2 | Unreal Tournament Map | 
| .UT2MOD | Unreal Tournament 2003/2004 Module File | 
| .UT3 | Unreal Tournament 3 Map File | 
| .UT4MOD | Unreal Tournament 2004 Module | 
| .UT8 | Ghost Master Language File | 
| .UTC | Bioware Creature File | 
| .UTF8 | Unicode UTF8-Encoded Text Document | 
| .UTW | Unity Whirld File | 
| .UTX | Unreal Texture Package | 
| .UTXT | Unicode Text File | 
| .UTZ | UIQ Theme Package | 
| .UU | Uuencoded File | 
| .UUD | UUDecoded File | 
| .UUE | Uuencoded File | 
| .UVF | Uncertain Value Format | 
| .UVW | UVW Coordinates File | 
| .UVX | Unreal Tournament 2003 Saved Game | 
| .UW | Unsigned Word Audio File | 
| .UWF | UltraTracker Wave File | 
| .UWL | User Word List File | 
| .UWRF | Universal Web Radio File | 
| .UXF | UML eXchange Format | 
| .UXX | Unreal Tournament Cache | 
| .UZIP | FreeBSD Compressed Disk Image |