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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .TSTREAM | Open Source | Uncommon Files | SwarmPlayer Streaming Torrent | SwarmPlayer | Open Source |
| .TTA | True Audio | Audio Files | True Audio File | XMMS | Open Source |
| .TTC | Various Developers | Font Files | TrueType Font Collection | FontForge | Open Source |
| .TTF | Apple | Font Files | TrueType Font | FontForge | Open Source |
| .TTL | Unknown Developer | Game Files | AGT Game Title File | AGiliTy | Open Source |
| .TTS | SumTotal Systems | Data Files | ToolBook Translation System File | Media Player Classic | Open Source |
| .TUN | High Voltage Software | Audio Files | LEGO Racers Audio File | Audacity | Open Source |
| .TWL | Open Source | GIS Files | Naviguide Binary GPS Track Data File | GPSBabel | Open Source |
| .TX8 | Microsoft Corporation | Text Files | DOS Text File | PSPad | Open Source |
| .TXL | Open Source | Developer Files | TXL Source Code | PSPad | Open Source |
| .TXS | Delphi Softwares | Uncommon Files | Beast (Trojan Horse) Data File | Tiny XML Server | Open Source |
| .TXTZ | Open Source | eBook Files | Compressed eBook File | Calibre | Open Source |
| .TXX | National Library of Medicine | Developer Files | Insight Segmentation And Registration Toolkit Data File | Insight Segmentation and Registration Toolkit | Open Source |
| .TXZ | Open Source | Compressed Files | XZ Compressed Tar Archive | Tukaani XZ Utils | Open Source |
| .TZX | Kromasoft | Game Files | Tanzzle Graphic Object File | Fuse | Open Source |
| .U | Epic Games | Game Files | Unreal Tournament Class Package | Dragon UnPACKer | Open Source |
| .UAX | Epic Games | Audio Files | Unreal Audio Package | Dragon UnPACKer | Open Source |
| .UB | Waveform Software | Audio Files | Unsigned Byte Audio File | SoX | Open Source |
| .UBIFS | Various Developers | Disk Image Files | Linux UBIFS Image | Linux | Open Source |
| .UBJ | The Buzz Media | Data Files | Universal Binary JSON File | Ubjson.NET | Open Source |
| .UDF | Open Source | Disk Image Files | Universal Disk Format Image File | PeaZip | Open Source |
| .UKX | Epic Games | Game Files | Unreal Animation Package | Dragon UnPACKer | Open Source |
| .ULT | Radionomy | Audio Files | UltraTracker Module | CocoModX | Open Source |
| .UMF | GetMediaHolder.com | Data Files | MediaHolder Universal Media Format File | PSPad | Open Source |
| .UMS | Open Source | Compressed Files | Dragon UnPACKer Version 5 Archive File | Dragon UnPACKer | Open Source |
| .UMX | Epic Games | Game Files | Unreal Music Package | ModPlug Player | Open Source |
| .UNF | Open Source | Game Files | UNIF ROM File | Nestopia | Open Source |
| .UNI | Open Source | Audio Files | MikMod UniMOD Module | CocoModX | Open Source |
| .UPD | Various Developers | Text Files | Program Update Information | Notepad2 | Open Source |
| .UPR | Open Source | Data Files | Fractal Parameters File | Apophysis | Open Source |
| .UPS | Open Source | Game 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 |
| .UPX | Open Source | Compressed Files | Ultimate Packer For eXecutables File | PeaZip | Open Source |
| .USR | FileMaker Inc. | Database Files | FileMaker Pro Database File | GPSBabel | Open Source |
| .USX | Epic Games | Game Files | Unreal Static Meshes | Dragon UnPACKer | Open Source |
| .UTX | Epic Games | Game Files | Unreal Texture Package | Dragon UnPACKer | Open Source |
| .UTXT | Open Source | Text Files | Unicode Text File | Notepad2 | Open Source |
| .UU | Open Source | Encoded Files | Uuencoded File | Uuencode | Open Source |
| .UUD | Open Source | Encoded Files | UUDecoded File | UUDeview | Open Source |
| .UUE | Open Source | Encoded Files | Uuencoded File | Uuencode | Open Source |
| .UWF | Marc Andrй Schallehn | Audio Files | UltraTracker Wave File | CocoModX | Open Source |
| .V | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | Icarus Verilog | Open Source |
| .V3D | Realmware Corporation | Data Files | Visual3D.NET Data File | 3D Object Converter | Open Source |
| .V5D | Open Source | Data Files | Vis5D Dataset UNIX Chemical | Vis5D | Open Source |
| .V64 | Nintendo | Game Files | Nintendo 64 ROM Dump | Project64 | Open Source |
| .VB | Microsoft Corporation | Developer Files | Visual Basic Project Item File | Red Dragon | Open Source |
| .VBR | Microsoft Corporation | Developer Files | Visual Basic Remote Automation Registration | Linux | Open Source |
| .VC | Software Arts | Spreadsheet Files | VisiCalc Spreadsheet | Verge | Open Source |
| .VCE | Avanset | Data Files | Visual CertExam Suite Exam File | Audacity | Open Source |
| .VCF | Palm | Data Files | VCard File | VirtualDub | Open Source |
| .VCH | Wholly Genes, Inc. | Data Files | Master Genealogist Genealogy Chart | Vocola | Open Source |
| .VCL | Open Source | Settings Files | Varnish Configuation File | Varnish Cache | Open Source |
| .VDF | Valve | Game Files | Valve Data File | VirtualDub | Open Source |
| .VDI | Oracle Corporation | Disk Image Files | VirtualBox Virtual Disk Image | StepMania | Open Source |
| .VDR | Avery Dennison | Video Files | VirtualDub Signpost File | VirtualDub | Open Source |
| .VEC | Omron Corporation | Vector Image Files | CX-Designer Shape File | OpenEmu | Open Source |
| .VERSION | Open Source | Data Files | Linux GateD Daemon Data | Linux | Open Source |
| .VFK | Sublime HQ Pty Ltd | Text Files | Czech Cadastral Exchange Data Format | PSPad | Open Source |
| .VFW | Open Source | Video Files | Video For Windows | Eltima Elmedia Player | Open Source |
| .VGM | Richard Bannister | Audio Files | Video Game Music File | Audacious | Open Source |
| .VGZ | Various Developers | Audio Files | Video Game Music Compressed File | Cog | Open Source |
| .VIM | Bram Moolenaar | Settings Files | Vim Settings File | gVim | Open Source |
| .VLT | zilliondigits | Encoded Files | WinVault File Archive | VideoLAN VLC Skin Editor | Open Source |
| .VLW | Open Source | Font Files | Processing Font File | Processing | Open Source |
| .VM | Apache HTTP Project Management Committee | Developer Files | Velocity Template | Apache Velocity | Open Source |
| .VMD | Open Source | Audio Files | Covox Raw Sample | Covoxer | Open Source |
| .VMF | Valve | Game Files | Valve Map File | Covoxer | Open Source |
| .VMI | Sega | Game Files | Dreamcast Doiwnload Info File | Dream Explorer | Open Source |
| .VMS | Sega | Data Files | Dreamcast VMU Save File | Dream Explorer | Open Source |
| .VMT | VMware | Settings Files | VMware Configuration File | VTFEdit | Open Source |
| .VNT | Sony | Text Files | Sony Ericsson Mobile Phone vNote File | Notepad2 | Open Source |
| .VOB | The DVD Forum | Video Files | DVD Video Object File | Eltima Elmedia Player | Open Source |
| .VOC | Creative Technology Ltd. | Audio Files | Creative Labs Audio File | AGiliTy | Open Source |
| .VOL | Open Source | Game Files | Video Game Archive | Dragon UnPACKer | Open Source |
| .VP | Accellera Systems Initiative | Encoded Files | Verilog Encrypted Source Code File | Celestia | Open Source |
| .VPK | Valve | Game Files | Valve Pak | GCFScape | Open Source |
| .VPL | Unknown Developer | Audio Files | Karaoke Player Playlist | vanBasco's Karaoke Player | Open Source |
| .VPM | Garmin | Audio Files | Garmin Voice File | TTSVoiceEditor | Open Source |
| .VRL | Unknown Developer | 3D Image Files | VRML World | FreeWRL | Open Source |
| .VRML | Open Source | Web Files | Virtual Reality Modeling Language 3D World | FreeWRL | Open Source |
| .VRO | VideoLAN | Video Files | DVD Video Recording Format | Squared 5 MPEG Streamclip | Open Source |
| .VS | OpenGL | 3D Image Files | Vertex Shader File | GreekToMe | Open Source |
| .VST | Microsoft Corporation | Raster Image Files | Targa Bitmap Image File | Audacity | Open Source |
| .VSY | Open Source | Web Files | VNC Spy Log File | VNC Spy | Open Source |
| .VTF | Valve | Game Files | Valve Texture File | VTF Explorer | Open Source |
| .VTS | Intel Corporation | Text Files | Intel VTune Program Performance Monitor Project | ParaView | Open Source |
| .VTX | Richard Bannister | Audio Files | VTX Chiptune File | Audacious | Open Source |
| .VU | Sony | Developer Files | Playstation 2 VU Development Source Code | xfit | Open Source |
| .VVF | Open Source | Data Files | Voc Vocabulary File | Voc | Open Source |
| .WA | Open Source | Compressed Files | Windows Addon Archive | Win Toolkit | Open Source |
| .WA2 | Midnight Synergy | Game Files | Wonderland Adventures Custom Adventure File | Subspace Continuum | Open Source |
| .WAV | Microsoft Corporation | Audio Files | WAVE Audio File | ModPlug Player | Open Source |
| .WB | Electronic Arts | Game Files | FIFA 2000 Game Data | Freelang | Open Source |
| .WB2 | Threefold Photos, Inc. | Raster Image Files | Webshots Picture File | Ultimate Webshots Converter | Open Source |
| .WBC | Threefold Photos, Inc. | Raster Image Files | Webshots Collection File | Ultimate Webshots Converter | Open Source |
| .WBD | Threefold Photos, Inc. | Raster Image Files | Webshots Picture File | Ultimate Webshots Converter | Open Source |
| .WBF | Microsoft Corporation | Developer Files | Microsoft Windows Batch File | PSPad | Open Source |
| .WBZ | Threefold Photos, Inc. | Raster Image Files | Webshots Download Picture File | Ultimate Webshots Converter | Open Source |
| .WCR | Open Source | Settings Files | Ergane Configuration File | Ergane | Open Source |
| .WDF | Workshare | Data Files | Workshare Compare DeltaFile | WiiJManager | Open Source |
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