| .TLS | AVG Technologies | Ikke Almindelige Filer | TuneUp Utilities Logon Screen | AVG TuneUp - Unlimited | AVG Technologies |
| .TMB | ARRIS | Ikke Almindelige Filer | Timbuktu Pro Connection Document | Timbuktu | ARRIS |
| .TML | Odetics Broadcast | Ikke Almindelige Filer | AIRO Timeline File Format | AIRO | Odetics Broadcast |
| .TMO | Yu Higuchi | Ikke Almindelige Filer | 3DCG Animation And Pose File | MikuMikuDance | Yu Higuchi |
| .TMPL | Xfire, Inc. | Ikke Almindelige Filer | Xfire User Interface Template | Xfire | Xfire, Inc. |
| .TNEF | Microsoft Corporation | Ikke Almindelige Filer | Transport Neutral Encapsulation Format | Microsoft Outlook Express | Microsoft Corporation |
| .TOAD | Unknown Developer | Ikke Almindelige Filer | FunkyToad System File | FunkyToad Network | Unknown Developer |
| .TOC | Sony | Ikke Almindelige Filer | Sony PlayStation Portable (PSP) Audio File | Exact Audio Copy for PSP Edition | Interscape |
| .TOO | DigiSoft Innovations | Ikke Almindelige Filer | Asm Objasm File | Golden Orchard | DigiSoft Innovations |
| .TORRENT | BitTorrent | Ikke Almindelige Filer | BitTorrent Information File | Shareaza | Open Source |
| .TR1 | IBM | Ikke Almindelige Filer | IBM Voice Type Languages Addword File | IBM Voice Type | IBM |
| .TRACE | VMware | Ikke Almindelige Filer | VMware ThinApp Trace Log File | VMware ThinApp 5 Suite | VMware |
| .TRANSFERIR | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .TRY | Microsoft Corporation | Ikke Almindelige Filer | SCCM 2012 R2 Despoolr.box | Microsoft system center configuration manager | Microsoft Corporation |
| .TSA | Symantec Corporation | Ikke Almindelige Filer | Jnana.tsa Malware | Avast Antivirus | Avast Software |
| .TSK | Microsoft Corporation | Ikke Almindelige Filer | Pocket PC Skin | Microsoft ActiveSync | Microsoft Corporation |
| .TSTREAM | Open Source | Ikke Almindelige Filer | SwarmPlayer Streaming Torrent | SwarmPlayer | Open Source |
| .TTI | Delphi Softwares | Ikke Almindelige Filer | Trojan File | Beast (Trojan Horse) | Delphi Softwares |
| .TTO | Unknown Developer | Ikke Almindelige Filer | Client Access Data Specification File | Unknown Software | Unknown Developer |
| .TTX | Simple DirectMedia Layer (SDL) | Ikke Almindelige Filer | Trados TagEditor File | SDL Trados | SDL Trados |
| .TVLINK | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TVT | IBM | Ikke Almindelige Filer | IBM Lenovo ThinkVantage Rescue And Recovery Data File | ThinkVantage Rescue and Recovery | IBM |
| .TVW | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TVX | Doug Cutting | Ikke Almindelige Filer | Apache Lucene Term Vector Index File | Apache Lucene | Apache Software Foundation |
| .TVZ | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .TWK | FileMaker Inc. | Ikke Almindelige Filer | T-Works Manager Data File | T-Works Manager | FileMaker Inc. |
| .TWR | Tripwire, Inc. | Ikke Almindelige Filer | Tripwire Report File | Tripwire Enterprise | Tripwire, Inc. |
| .TX2 | Typequick Pty Ltd | Ikke Almindelige Filer | Typequick File | Typequick | Typequick Pty Ltd |
| .TXG | ESRI | Ikke Almindelige Filer | Georeference Subobject File | ERDAS Imagine | Hexagon Geospatial |
| .TXM | CFP Software Limited | Ikke Almindelige Filer | CFPwinMan Document File | CFPwinMan | CFP Software Limited |
| .TXS | Delphi Softwares | Ikke Almindelige Filer | Beast (Trojan Horse) Data File | Beast (Trojan Horse) | Delphi Softwares |
| .TX_ | Microsoft Corporation | Ikke Almindelige Filer | Compressed TXT File | Microsoft Makecab | Microsoft Corporation |
| .TY2 | Unknown Developer | Ikke Almindelige Filer | Gualtieri Theme Maker File | Gualtieri Theme Maker | Unknown Developer |
| .TYP | Unknown Developer | Ikke Almindelige Filer | Thumbs32 File | Unknown Software | Unknown Developer |
| .TZD | AOL | Ikke Almindelige Filer | Netscape Communicator Locale File | Netscape Communicator | NetScape |
| .TZG | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .U2C | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .U2E | Unreal Software | Ikke Almindelige Filer | Unreal Game Translation | Unknown Software | Unknown Developer |
| .UAD | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .UBM | Apple | Ikke Almindelige Filer | IPhoto Mtwain Install File | Apple iPhoto | Apple |
| .UBS | Microsoft Corporation | Ikke Almindelige Filer | Tracesrv Bugslayer Utility File | Tracesrv Bugslayer Windows Utility Software | Microsoft Corporation |
| .UCA | Unknown Developer | Ikke Almindelige Filer | Unicode Collation Algorithm Data File | Unknown Software | Unknown Developer |
| .UDI | Pinnacle Systems Inc. | Ikke Almindelige Filer | Dazzle DVD Complete File | Dazzle DVD Complete | Pinnacle Systems Inc. |
| .UHS | Jason Strautman | Ikke Almindelige Filer | Universal Hint System Binary Data File | Universal Hint System | Jason Strautman |
| .UK_ | Unknown Developer | Ikke Almindelige Filer | Mcguiness File | Unknown Software | Unknown Developer |
| .UNIX BAR COMPRESSED FILE ARCHIVE | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .UNKNOWN | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .UNL | Garmin | Ikke Almindelige Filer | Garmin Unlock File | MapSource | Garmin |
| .UNM | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .UP2 | Ulead Systems | Ikke Almindelige Filer | Ulead Cool 3D Plugins Board File | MotionStudio 3D | Corel |
| .UPDATED | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .UPG | Unknown Developer | Ikke Almindelige Filer | Upgrade File | ANCILE uPerform Client | ANCILE Solutions |
| .USAGE | Unknown Developer | Ikke Almindelige Filer | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Atom | GitHub, Inc. |
| .USB | SiSoftware | Ikke Almindelige Filer | SiSoftware Sandra Data | SiSoftware Sandra | SiSoftware |
| .UVC | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .UXR | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .UXT | WaveMetrics | Ikke Almindelige Filer | IGOR Pro Unpacked Experiment Template File | IGOR Pro | WaveMetrics |
| .V11 | bexio AG | Ikke Almindelige Filer | ESR V11 Data | Einzahlungsschein mit Referenznummer (ESR) | bexio AG |
| .V48 | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .V50 | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .VAX | Unknown Developer | Ikke Almindelige Filer | Pbm Plus File | Unknown Software | Unknown Developer |
| .VCB | VMware | Ikke Almindelige Filer | VMware Consolidated Backup Archive | VMware Server | VMware |
| .VCMP | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VCY | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VC_ | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VDH | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VDI | Oracle Corporation | Ikke Almindelige Filer | VirtualBox Virtual Disk Image | Oracle VM VirtualBox | Oracle Corporation |
| .VDMPVF | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VHA | Macromedia | Ikke Almindelige Filer | Macromedia Sitespring File | Unknown Software | Unknown Developer |
| .VHDPMEM | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .VHP | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VIR | Symantec Corporation | Ikke Almindelige Filer | Virus Infected File | Avira Antivirus Pro 2016 | Avira Operations GmbH & Co. KG. |
| .VKL | Virtualedit | Ikke Almindelige Filer | Virtual Edit File | Virtual Edit | Virtualedit |
| .VLQ | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VMCZ | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .VMG | Nokia | Ikke Almindelige Filer | Nokia Text Message | Nokia PC Suite | Nokia |
| .VMSG | VMware | Ikke Almindelige Filer | VMware Application Message File | VMware Workstation | VMware |
| .VOR | Sun Microsystems | Ikke Almindelige Filer | StarOffice Template | Apache OpenOffice | Apache Software Foundation |
| .VPA | Halsoft.com, Inc | Ikke Almindelige Filer | VPchat Chat Gestures File | VPchat | Halsoft.com, Inc |
| .VPH | optikVerve Labs | Ikke Almindelige Filer | VirtualPhotographer Custom Settings | Adobe Photoshop | Adobe Systems Incorporated |
| .VRA | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VS | OpenGL | Ikke Almindelige Filer | Vertex Shader File | Microsoft DirectX SDK | Microsoft Corporation |
| .VSTEMPLATE | Microsoft Corporation | Ikke Almindelige Filer | Microsoft Visual Studio Project Template | Microsoft Visual Studio | Microsoft Corporation |
| .VUX | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .VYB | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .W | Progress Software Corporation | Ikke Almindelige Filer | OpenEdge Architect Source Code File | OpenEdge | Progress Software Corporation |
| .W2F | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .W73 | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .WAL | Nullsoft | Ikke Almindelige Filer | Winamp Modern Skin | Nullsoft Winamp | Nullsoft |
| .WBA | Stardock Corporation | Ikke Almindelige Filer | WindowBlinds Compressed Skin | WindowBlinds | Stardock Corporation |
| .WC4 | Unknown Developer | Ikke Almindelige Filer | WinCheckIt4 Settings File | Unknown Software | Unknown Developer |
| .WCINV | Microsoft Corporation | Ikke Almindelige Filer | Windows Meeting Space Invitation File | Windows Meeting Space | Microsoft Corporation |
| .WCM | Corel | Ikke Almindelige Filer | WordPerfect Macro | Corel WordPerfect X8 | Corel |
| .WCXF | PenPower | Ikke Almindelige Filer | WorldCard Exchange File | WorldCard Mobile | PenPower |
| .WDSEML | Mozilla | Ikke Almindelige Filer | Thunderbird Searchable Email File | Mozilla Thunderbird | Mozilla |
| .WEBARCHIV | Unknown Developer | Ikke Almindelige Filer | Unknown File Type | Unknown Software | Unknown Developer |
| .WEI | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .WER | Microsoft Corporation | Ikke Almindelige Filer | Windows Error Report File | Microsoft Notepad | Microsoft Corporation |
| .WF2 | Unknown Developer | Ikke Almindelige Filer | Uncommon File Extension | Unknown Software | Unknown Developer |
| .WGS | ChannelAdvisor | Ikke Almindelige Filer | Walk-Graph Segment File | RichFX Player | eHelp Corporation |
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