| tsb | 3dMD 3D Image |
| tsce | TextShield Compressed RTF File |
| tse | Light Map Maker Scene |
| tst | Corel WordPerfect 5 Printer Test Document |
| ExamView Test File |
| tsv | Tab-Separated Values Data |
| ttax | Newton Dictate Transcription Document |
| ttl | Turtle Language Document |
| ttml | Timed Text Markup Language Document |
| tts | ToolBook Translation System Document |
| tvj | TrueView Job Ticket |
| twd | MindMapper Map |
| twdi | ThinkWise Document |
| twds | MindMapper Single File |
| twdx | MindMapper 12 XML Map |
| twiki | Eclipse IDE WikiText Document |
| txd | RenderWare Texture Data |
| txe | Enriched Text File |
| txh | Lightweight Markup Language Text |
| txlf | SDL Trados XLIFF Document |
| txm | CFPwinMan Document |
| txml | Wordfast TXML Document |
| txt | MilkShape 3D ASCII Data |
| Plain Text Document |
| u3d | Universal 3D File |
| ubz | Open-Sankore Document |
| OpenBoard Document |
| ucls | ObjectAid UML Explorer Class Diagram |
| udf | PI Expert Document |
| UYAP Editor Document |
| uez | Ulead COOL 3D Image |
| ufdl | Universal Forms Description Language Document |
| ug | Unigraphics Drawing |
| uga | Ulead GIF Animator File |
| uhtml | UC Browser Saved Page |
| uk | English Language Info File |
| unix | Unix Readme Document |
| unx | Unix Text |
| uof | Uniform Office Format Document |
| uop | Uniform Office Format Presentation |
| uos | Uniform Office Format Spreadsheet |
| uot | Uniform Office Format Text |
| up3 | UP! Printer 3D Model |
| updf | UltraPdf Publication Document |
| urdf | Universal Robotic Description Format Document |
| us | English Language Info File |
| utf | UTF-8 Encoded Text File |
| utf8 | Unicode UTF8 Encoded Text Document |
| utxt | Unicode Text File |
| uvl | UVLayout Document |
| uxdc | Microsoft Office XML Data Source |
| uxf | UML eXchange Format File |
| uxy | Orchida Embroidery System Design |
| uzed | Compressed Unicode GEDCOM Document |
| v2d | ViaCAD 2D Drawing |
| v3d | ViaCAD 3D Drawing |
| v3m | Vectric VCarve Pro 3D Model |
| v3v | Vector Art 3D Model |
| vbk | Visual CADD Backup |
| vbo | Microsoft Access Package Deployment References Data |
| vc | VisiCalc Spreadsheet |
| vc6 | Ashlar-Vellum Graphite Document |
| vcard | VCard Data |
| vcd | Visual CADD Drawing |
| vce | Visual CertExam Exam Data |
| vcf | VCard Data |
| vcg | VCG Graph |
| vclip | VinylMaster Clipart Data |
| vclipp | Vectric VCarve Pro Clipart Preview Document |
| vcp | ViaCAD Pro Drawing |
| vcs | vCalendar Document |
| vcx | VisiCalc Advanced Spreadsheet |
| vcz | Pictures by PC Compressed Drawing |
| vda | VDA-FS CAD Document |
| vdcl | VectorDraw Compressed Drawing |
| vdml | VectorDraw Drawing |
| vdoc | VinylMaster Cut Document |
| vdw | Microsoft Visio Web Drawing |
| vdx | Microsoft Visio Diagram XML |
| ve | Vinyl Express LXi Design |
