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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .U98 | Sierra Entertainment | Data Files | USA 98 Streets & Destinations Tour Data File | USA 98 Streets & Destinations | Sierra Entertainment |
| .UBF | Marker Communication | Data Files | MXT3010 Universal Boot Format | Unknown Software | Unknown Developer |
| .UBJ | The Buzz Media | Data Files | Universal Binary JSON File | Universal Binary JSON Binary Java Library | GitHub, Inc. |
| .UBK | Craftsman Book Company | Data Files | National Construction Estimator 32 User Costbook File | National Construction Estimator | Craftsman Book Company |
| .UBOX | Giant Army | Data Files | Universe Sandbox Saved Data | Universe Sandbox | Giant Army |
| .UBZ | Unknown Developer | Data Files | Open-Sankore Document | Open-Sankoré | Unknown Developer |
| .UCC | National LawForms, Inc. | Data Files | Uniform Commercial Code Form File | National UCC Financing Statement Software | National LawForms, Inc. |
| .UCCAPILOG | Microsoft Corporation | Data Files | Microsoft UCC API Log File | Microsoft Windows Live Messenger | Microsoft Corporation |
| .UCF | Cisco Systems | Data Files | WebEx Media File | WebEx Meetings | Cisco Systems |
| .UCV | Anthony R. Daly | Data Files | Universal Converter Conversion File | Universal Converter | Soft Solutions Ltd. |
| .UCX | IBM | Data Files | Rational XDE Data | Rational Rose | IBM |
| .UD | Nuance | Data Files | OmniPage User Dictionary | Nuance OmniPage Pro X | Nuance |
| .UDT | wyDay | Data Files | User Defined Type Data | WyBuild | wyDay |
| .UDX | Power Integrations | Data Files | PI Expert Design Software Data | PI Expert Suite | Power Integrations |
| .UFD | Cellebrite | Data Files | UFED Physical Analyzer Data | UFED Physical Analyzer | Cellebrite |
| .UFF | DataWave Technologies | Data Files | DataWave SciWorks Physiological Data File | SciWorks | DataWave Technologies |
| .UFO | Ulead Systems | Data Files | Ulead File Object | Ulead Photo Express | Ulead Systems |
| .UFS | iXsystems | Data Files | FreeBSD Unix File System File | iXsystems PC-BSD | iXsystems |
| .UGA | Microsoft Corporation | Data Files | Ulead GIF Animator File | GIF Animator | Microsoft Corporation |
| .UID | IBM | Data Files | IBM VoiceType User Data File | IBM Voice Type | IBM |
| .UIL | IBM | Data Files | AIX User Interface Language | IBM AIX | IBM |
| .UIN | Mail.Ru | Data Files | ICQ 2001 Saved ICQ Contact Information | ICQ | Mail.Ru |
| .ULB | Micro Focus International plc | Data Files | COBOL Unisys Library File | ACUCOBOL-GT | Micro Focus International plc |
| .ULF | MRF GeoSystems | Data Files | Universal List File | MRF Mapping Tool Kit | MRF GeoSystems |
| .ULS | Microsoft Corporation | Data Files | NetMeeting User Location Service File | Microsoft NetMeeting | Microsoft Corporation |
| .ULZ | Microsoft Corporation | Data Files | Windows Updates Downloader Update List File | Windows Updates Downloader | Microsoft Corporation |
| .UM | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UMC | Crestron Electronics | Data Files | SIMPL Application | SIMPL Windows | Crestron Electronics |
| .UMF | GetMediaHolder.com | Data Files | MediaHolder Universal Media Format File | MediaHolder | GetMediaHolder.com |
| .UMI | Creative Technology Ltd. | Data Files | Creative PlayCenter CDDB Database File | Creative PlayCentre | Creative Technology Ltd. |
| .UND | DHI | Data Files | MOUSE Urban Network Datafile | Unknown Software | Unknown Developer |
| .UNF | Open Source | Data Files | UNIF ROM File | Nestopia | Open Source |
| .UNI | Open Source | Data Files | MikMod UniMOD Module | CocoModX | Open Source |
| .UNIVERSAL3 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UNK | Shimadzu Scientific Instruments | Data Files | UVProbe Data File | UVProbe | Shimadzu Scientific Instruments |
| .UNLOCK | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UNQ | Swiftpage, Inc. | Data Files | ACT! 3.0 Email Message Attachment | Act! | Swiftpage, Inc. |
| .UNT | Autodesk, Inc. | Data Files | AutoCAD Unit Definition Data File | Autodesk AutoCAD | Autodesk, Inc. |
| .UNV | SAP | Data Files | BusinessObjects Universe Data File | SAP BusinessObjects Business Intelligence | SAP |
| .UNX | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .UPD | Various Developers | Data Files | Program Update Information | Microsoft Notepad | Microsoft Corporation |
| .UPJ | Ulead Systems | Data Files | Ulead Project File | Burn.Now | Corel |
| .UPL | StarMoney | Data Files | StarMoney Agent Download File | StarMoney | StarMoney |
| .UPO | dBase, LLC | Data Files | DBASE Compiled Update Data File | dBase | dBase, LLC |
| .UPR | Open Source | Data Files | Fractal Parameters File | Apophysis | Open Source |
| .UPS | Open Source | Data Files | UPS Patch File | MultiPatch patching tool | Open Source |
| .UPT | Open Source | Data Files | Connectivity Memory Model Update Timing Input Data File | Neural Network Simulation Software | Open Source |
| .UPZ | StarMoney | Data Files | StarMoney Agent Download File | StarMoney | StarMoney |
| .URD | Kinook Software, Inc. | Data Files | Ultra Recall Database File | Ultra Recall | Kinook Software, Inc. |
| .URF | Matinsoft Inc. | Data Files | AppFace Skin File | AppFace User Interface Development Kits | Matinsoft Inc. |
| .URI | Microsoft Corporation | Data Files | List Of Uniform Resource Identifiers | Microsoft Notepad | Microsoft Corporation |
| .USA | Microsoft Corporation | Data Files | American English Localization Language File | Microsoft Notepad | Microsoft Corporation |
| .USAGE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .USE | Unknown Developer | Data Files | Log File | Microsoft Notepad | Microsoft Corporation |
| .USL | Hewlett-Packard | Data Files | LaserJet Landscape Font File | Classical Text Editor | Stefan Hagel |
| .USR | FileMaker Inc. | Data Files | FileMaker Pro Database File | FileMaker Pro | FileMaker Inc. |
| .UST | UTAU Team | Data Files | UTAU Sequence Text File | Vocal Synthesizer Tool UTAU | UTAU Team |
| .USTAR | Smith Micro Software | Data Files | Uniform Standard Tape Archive Format File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .UTF | AOL | Data Files | AOL Update Data | AOL | AOL |
| .UTILITY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UTL | Intuit, Inc. | Data Files | QuickBooks Data File | Intuit QuickBooks Pro | Intuit, Inc. |
| .UTMP | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .UUT | Genesis 2000, Inc | Data Files | Genesis 2000 Data File | Genesis 2000 | Genesis 2000, Inc |
| .UV2 | Electronic Arts | Data Files | Jane's Combat Simulations: F-15 Game Data File | Jane's Combat Simulations: F-15 Game | Electronic Arts |
| .UVF | Norsys Software Corp | Data Files | Uncertain Value Format | Norsys Netica | Norsys Software Corp |
| .UVP | Corel | Data Files | Ulead MediaStudio Data File+ | Ulead MediaStudio | Corel |
| .UVPROJ | Keil | Data Files | µVision Project File | µVision4 | Keil |
| .UVPROJX | Keil | Data Files | µVision Project File | µVision4 | Keil |
| .UVU | Microsoft Corporation | Data Files | Movie Maker Video Data | Microsoft Windows Live Movie Maker | Microsoft Corporation |
| .UVW | Autodesk, Inc. | Data Files | UVW Coordinates File | Autodesk 3ds Max | Autodesk, Inc. |
| .UWL | Corel | Data Files | User Word List File | Corel WordPerfect X8 | Corel |
| .UWS | UniTechnology Limited | Data Files | UniTrader 2006 Website Archive File | UniTrader 2006 Website | UniTechnology Limited |
| .UXDC | Microsoft Corporation | Data Files | Microsoft Excel Data Retrieval Service Connection File | Microsoft Excel | Microsoft Corporation |
| .UXF | UMLet Team | Data Files | UMLet UML EXchange Format File | UMLet | UMLet Team |
| .UZ | Epic Games | Data Files | Unreal Tournament Server File | Unreal Tournament | Epic Games |
| .UZN | Apache Software Foundation | Data Files | Tesseract-Migneuzn Tool Output File | Tesseract-OCR | Apache Software Foundation |
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