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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .TELL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEMPLATE | Apple | Text Files | Apple Pages Template | Apple Pages | Apple |
| .TESTING | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TEXT | Sublime HQ Pty Ltd | Text Files | Plain Text File | Apple TextEdit | Apple |
| .TEXTCLIPPING | Apple | Text Files | Mac OS X Text Clipping File | Apple Finder | Apple |
| .TGA | Avid Technology | Raster Image Files | Targa Graphic | Apple QuickTime Player | Apple |
| .TGZ | Various Developers | Compressed Files | Gzipped Tar File | Apple Archive Utility | Apple |
| .THM | Sony | Uncommon Files | Sony Ericsson Mobile Phone Theme File | Apple Photos | Apple |
| .TICKET | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TIF | XnSoft | Raster Image Files | Tagged Image File Format | Apple Photos | Apple |
| .TIFF | XnSoft | Raster Image Files | Tagged Image File Format | Apple Photos | Apple |
| .TIM | Sierra Entertainment | Game Files | The Incredible Machine Level | Apple Photos | Apple |
| .TIPS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TITLE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .TLB | Various Developers | Text Files | VAX Text Library | Apple TextEdit | Apple |
| .TLD | The Eclipse Foundation | Developer Files | Tag Library Descriptor File | Apple TextEdit | Apple |
| .TMP | Mozilla | Backup Files | General Temporary File | Apple Safari | Apple |
| .TNEF | Microsoft Corporation | Uncommon Files | Transport Neutral Encapsulation Format | Apple Mail | Apple |
| .TO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TOD | JVCKenwood Group | Video Files | JVC Everio Video Capture File | iMovie | Apple |
| .TOOL | Apple | Data Files | Apple Terminal Data | Apple Terminal | Apple |
| .TRACK0 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .TRACKS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRAVEL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRI | Singular Inversions | 3D Image Files | FaceGen Polygonal Model File | Apple TextEdit | Apple |
| .TRIAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TRUETYPE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TS | Various Developers | Video Files | Video Transport Stream File | Apple DVD Player | Apple |
| .TSQ | Microsoft Corporation | Developer Files | ODBC Script File | Apple ODBC Administrator | Apple |
| .TTC | Various Developers | Font Files | TrueType Font Collection | Font Book | Apple |
| .TTF | Apple | Font Files | TrueType Font | Font Book | Apple |
| .TTS | SumTotal Systems | Data Files | ToolBook Translation System File | Apple QuickTime Player | Apple |
| .TUR | Holt Software | Developer Files | Turing Program Source File | Apple TextEdit | Apple |
| .TWO | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TXE | Open Source | Text Files | Enriched Text File | Apple TextEdit | Apple |
| .TXT | Sublime HQ Pty Ltd | Text Files | Plain Text File | Apple TextEdit | Apple |
| .U | Epic Games | Game Files | Unreal Tournament Class Package | Apple QuickTime Player | Apple |
| .UB | Waveform Software | Audio Files | Unsigned Byte Audio File | Apple QuickTime Player | Apple |
| .UBM | Apple | Uncommon Files | IPhoto Mtwain Install File | Apple iPhoto | Apple |
| .UG | Autodesk, Inc. | Vector Image Files | Drawing File | Apple AppleWorks | Apple |
| .UM | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UNIVERSAL3 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UNLOCK | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UNX | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .UPI | Ulead Systems | Graphic Files | Ulead PhotoImpact Plugin | Apple iPhoto | Apple |
| .URL | Microsoft Corporation | Web Files | Internet Shortcut | Apple TextEdit | Apple |
| .USAGE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .USE | Unknown Developer | Text Files | Log File | Apple TextEdit | Apple |
| .USER | Microsoft Corporation | Settings Files | Visual Studio Project User Options File | Apple TextEdit | Apple |
| .UTILITY | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UTMP | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .UU | Open Source | Encoded Files | Uuencoded File | Apple Archive Utility | Apple |
| .UUE | Open Source | Encoded Files | Uuencoded File | Apple Archive Utility | Apple |
| .UW | Apple | Audio Files | Unsigned Word Audio File | Apple QuickTime Player | Apple |
| .V | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | Apple QuickTime Player | Apple |
| .V5 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .V6 | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .VAC | Ipswitch, Inc. | Data Files | IMail Server Vacation Message File | macOS | Apple |
| .VB | Microsoft Corporation | Developer Files | Visual Basic Project Item File | Apple TextEdit | Apple |
| .VBD | Microsoft Corporation | Web Files | Visual Basic ActiveX Document | Apple Safari | Apple |
| .VBR | Microsoft Corporation | Developer Files | Visual Basic Remote Automation Registration | macOS | Apple |
| .VC4 | Microsoft Corporation | Developer Files | Visual C++ 4 File | Apple TextEdit | Apple |
| .VCF | Palm | Data Files | VCard File | Apple Contacts | Apple |
| .VCS | Microsoft Corporation | Data Files | vCalendar Event File | Apple Calendar | Apple |
| .VFW | Open Source | Video Files | Video For Windows | Apple QuickTime Player | Apple |
| .VID | Unknown Developer | Video Files | Generic Video File | Apple QuickTime Player | Apple |
| .VIEWER | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .VNT | Sony | Text Files | Sony Ericsson Mobile Phone vNote File | Apple TextEdit | Apple |
| .VOB | The DVD Forum | Video Files | DVD Video Object File | Apple DVD Player | Apple |
| .VOICE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .VOL | Open Source | Game Files | Video Game Archive | macOS | Apple |
| .VP | Accellera Systems Initiative | Encoded Files | Verilog Encrypted Source Code File | OpenGL | Apple |
| .VP3 | On2 Technologies | Video Files | On2 Streaming Video File | Apple QuickTime Player | Apple |
| .VRO | VideoLAN | Video Files | DVD Video Recording Format | Apple QuickTime Player | Apple |
| .VXML | Voxeo Corporation | Data Files | VoiceXML File | Apple TextEdit | Apple |
| .WALKER | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .WAV | Microsoft Corporation | Audio Files | WAVE Audio File | Apple iTunes | Apple |
| .WB | Electronic Arts | Game Files | FIFA 2000 Game Data | Apple Logic Studio | Apple |
| .WDGT | Opera Software | Web Files | Opera Widget File | Apple OS X | Apple |
| .WEBARCHIVE | Apple | Web Files | Safari Web Archive | Apple TextEdit | Apple |
| .WEBARCHIVE FILE EXTENSION | Apple | Web Files | Apple Safari Web Archive | Safari | Apple |
| .WEBLOC | Apple | Web Files | Mac OS X Website Location | Apple Safari | Apple |
| .WEBM | Video Files | WebM Video File | olimsoft OPlayer | Apple | |
| .WESTERN | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .WFC | Microsoft Corporation | Settings Files | Windows Wireless Network Settings File | Apple TextEdit | Apple |
| .WFLOW | Apple | Data Files | Apple Automator Workflow Data | Apple Automator | Apple |
| .WIDGET | Microsoft Corporation | Executable Files | Microsoft Windows Mobile Widget | Apple Archive Utility | Apple |
| .WMA | Microsoft Corporation | Audio Files | Windows Media Audio File | Apple QuickTime Player | Apple |
| .WMV | Microsoft Corporation | Video Files | Windows Media Video File | Apple QuickTime Player | Apple |
| .WMZ | Microsoft Corporation | Settings Files | Compressed Windows Media Player Skin | Apple Archive Utility | Apple |
| .WOA | Apple | Web Files | WebObjects Application | Apple Safari | Apple |
| .WOD | Apple | Developer Files | WebObjects Declaration File | WebObjects | Apple |
| .WOMEN | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .WORKFLOW | Apple | Executable Files | Automator Workflow | Apple Automator | Apple |
| .WP | Corel | Text Files | WordPerfect Document | Universal Document Viewer Pro | Apple |
| .WPD | Corel | Text Files | WordPerfect Document | Universal Document Viewer Pro | Apple |
| .WPR | Apple | Plugin Files | Apple Logic Studio WaveBurner Plug-in Preset File | Logic Pro X | Apple |
| .WS | MicroPro International Corp. | Text Files | WordStar Document | Apple TextEdit | Apple |
| .WWF | World Wide Fund (WWF) | Page Layout Files | World Wide Fund Non-Printable Document | Apple Preview | Apple |
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