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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .REZCODE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RGB | Silicon Graphics, Inc. | Raster Image Files | RGB Bitmap | Apple QuickTime Player | Apple |
| .RHTML | Yukihiro “Matz” Matsumoto | Web Files | Ruby HTML Web Page | Apple Safari | Apple |
| .RL4 | Various Developers | Raster Image Files | Bitmap Image File | Apple Photos | Apple |
| .RLELZW | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .RMI | Open Source | Audio Files | RMID MIDI File | Apple QuickTime Player | Apple |
| .RMP | RealNetworks | Video Files | RealPlayer Metadata Package File | Apple iTunes | Apple |
| .RMT | The Catalina Group | System Files | Router Firmware File | Apple Safari | Apple |
| .RMVB | RealNetworks | Video Files | RealMedia Variable Bit Rate File | olimsoft OPlayer | Apple |
| .ROUT | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROUTINES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .ROY | Apple | Font Files | TrueType File | TrueType | Apple |
| .RPT | SAP | Data Files | Crystal Reports File | Apple Pages | Apple |
| .RST | David Goodger | Text Files | ReStructuredText File | Apple TextEdit | Apple |
| .RTF | Microsoft Corporation | Text Files | Rich Text Format File | Apple Pages | Apple |
| .RTFD | Apple | Text Files | Rich Text Format Directory File | Apple TextEdit | Apple |
| .RTS | Heaventools Software | Developer Files | Resource Tuner Console Script | Apple QuickTime Player | Apple |
| .RTSP | Apple | Audio Files | Apple QuickTime Real-Time Streaming Protocol File | Apple QuickTime Player | Apple |
| .RTX | The Document Foundation | Text Files | Rich Text Document | Apple TextEdit | Apple |
| .RU | Microsoft Corporation | Text Files | Russian Text Or Localization File | Apple TextEdit | Apple |
| .S7Z | Igor Pavlov | Compressed Files | 7-Zip Compressed File | Sixty Five 7zX | Apple |
| .SAVER | Apple | System Files | Mac OS X Screen Saver | Apple OS X | Apple |
| .SB | MIT Media Lab | Developer Files | Scratch Project File | Apple QuickTime Player | Apple |
| .SCC | Microsoft Corporation | Developer Files | SourceSafe Source Code Control File | Apple DVD Studio Pro | Apple |
| .SCORES | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .SCRIPT | Unknown Developer | Executable Files | Generic Script File | Apple Pages | Apple |
| .SCSS | Sublime HQ Pty Ltd | Web Files | Syntactically Awesome Stylesheets Syntax Data | Apple TextEdit | Apple |
| .SCT | Scitex | Raster Image Files | Scitex Continuous Tone File | Apple TextEdit | Apple |
| .SD2 | Avid Technology | Audio Files | Sound Designer II File | Apple iTunes | Apple |
| .SD2F | Avid Technology | Audio Files | Sound Designer II File | Apple iTunes | Apple |
| .SDEF | Apple | Developer Files | AppleScript Dictionary Document | Apple Xcode | Apple |
| .SDL | Microsoft Corporation | Developer Files | Service Description Language File | Safari | Apple |
| .SDP | Oracle Corporation | Data Files | StarOffice Presentation File | Apple QuickTime Player | Apple |
| .SDS | Oracle Corporation | Data Files | OpenOffice.org Chart | Apple QuickTime Player | Apple |
| .SDX | Kivuto | Uncommon Files | Kivuto Secure Download Manager File | Apple QuickTime Player | Apple |
| .SERIAL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SETUP | Crytek | Developer Files | CryENGINE Character Setup File | Apple OS X | Apple |
| .SGI | Silicon Graphics, Inc. | Raster Image Files | Silicon Graphics Image File | Apple Preview | Apple |
| .SH | Unknown Developer | Developer Files | Bash Shell Script | Apple Terminal | Apple |
| .SHELL | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SHOP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SHT | The Document Foundation | Web Files | HTML File With Server Side Includes | Apple TextEdit | Apple |
| .SHTM | Opera Software | Video Files | HTML Server Side Include File | Apple TextEdit | Apple |
| .SIGNUP | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .SK | Apple | Uncommon Files | Safari History Index File | Apple Safari | Apple |
| .SLAP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SMART2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SMF | Oracle Corporation | Text Files | StarMath Formula File | Apple QuickTime Player | Apple |
| .SMI | Apple | Disk Image Files | Self-Mounting Disk Image | Apple Disk Utility | Apple |
| .SMIL | "Synchronized Multimedia" Working Group (SYMM WG) | Video Files | SMIL(Synchronized Multimedia Integration Language) Presentation File | Apple QuickTime Player | Apple |
| .SML | ESRI | Developer Files | ARC/INFO Simple Macro Language File | Apple QuickTime Player | Apple |
| .SML2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SND | Open Source | Audio Files | Sound File | Apple QuickTime Player | Apple |
| .SNG | Korg | Audio Files | Korg Trinity Song File | Apple QuickTime Player | Apple |
| .SOFTWARE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SON | Open Source | Audio Files | Notator SL Audio File | Apple Logic Pro | Apple |
| .SOUND | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .SOUNDS | id Software | Game Files | Quake 3 Engine Sound Definition File | Apple TextEdit | Apple |
| .SOURCE | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .SPADES | Unknown Developer | Data Files | Unknown Apple II File. (found On Golden Orchard Apple II CD Rom) | Apple IIGS | Apple |
| .SPARSE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SPK | Atari Corporation | Game Files | Deer Hunter Map File | Apple Archive Utility | Apple |
| .SPRITES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SPS | IBM | Data Files | SPSS Program File | Apple TextEdit | Apple |
| .SPX | Xiph.Org | Audio Files | Ogg Vorbis Speex File | Apple QuickTime Player | Apple |
| .SQL | Various Developers | Database Files | Structured Query Language Data File | Apple TextEdit | Apple |
| .SS | Open Source | Developer Files | SilverStripe Source Code File | Apple TextEdit | Apple |
| .SSC | Microsoft Corporation | Developer Files | SourceSafe Status File | Apple TextEdit | Apple |
| .SSQ | Microsoft Corporation | Developer Files | ODBC Script File | Apple ODBC Administrator | Apple |
| .STACK | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .STAGE1 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .STAR | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .STARTUP | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .STC | Adobe Systems Incorporated | Web Files | Contribute Connection Key File | Apple Pages | Apple |
| .STE | Adobe Systems Incorporated | Settings Files | Dreamweaver Site Settings File | Apple Pages | Apple |
| .STL | 3D Systems | CAD Files | Stereolithography File | Apple Final Cut Pro | Apple |
| .STORAGE | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .STRINGS | Apple | Text Files | Text Strings File | Apple TextEdit | Apple |
| .SUB | URUWORKS | Text Files | Subtitle File | olimsoft OPlayer | Apple |
| .SUI | Sean Maxwell | Data Files | StarSplatter User Interface File | macOS | Apple |
| .SUIT | Apple | Font Files | Macintosh Font Suitcase | Apple OS X | Apple |
| .SUPP | Apple | Data Files | iOS Data File | Apple iOS | Apple |
| .SVR | Superscape | Web Files | Compressed Virtual World | Safari | Apple |
| .SVX | The Survex Project | GIS Files | Survex Cavern Data File | Apple TextEdit | Apple |
| .SWAP | Microsoft Corporation | System Files | Swap File | Apple OS X | Apple |
| .SWP | Microsoft Corporation | System Files | Swap File | Apple OS X | Apple |
| .SYMBOLS | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SYNC | Apple | Data Files | Apple ColorSync File | Apple OS X | Apple |
| .SYNTAX | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SYSLOG | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .SYSTEM | Open Source | Game Files | Vega Strike Virtual System File | Apple TextEdit | Apple |
| .T2 | RM Education | Data Files | Textease 2000 File | macOS | Apple |
| .TABLE1 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TABLES | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TALK2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TAR | Jean-loup Gailly and Mark Adler | Data Files | Consolidated Unix File Archive | Apple Archive Utility | Apple |
| .TBZ2 | Winrar | Compressed Files | Tar BZip 2 Compressed File | Apple Archive Utility | Apple |
| .TDF | DVD Copy | Settings Files | Title Definition Format File | Apple Xserve Diagnostics | Apple |
| .TEASERS2 | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
| .TECH | Apple | Data Files | Golden Orchard Apple II CD Rom File | Apple OS X | Apple |
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