| .RESW | Microsoft Corporation | Arquivos de desenvolvedor | Microsoft Windows 8 Resources File | Microsoft Windows 8 | Microsoft Corporation |
| .RESX | Microsoft Corporation | Arquivos de desenvolvedor | .NET Managed Resources File | Microsoft Visual Studio | Microsoft Corporation |
| .REX | Propellerhead | Arquivos de desenvolvedor | ReCycle Loop File | Avid Pro Tools | Avid Technology |
| .REXX | SourceForge | Arquivos de desenvolvedor | Rexx Source | Regina Rexx Interpreter | SourceForge |
| .RH | Microsoft Corporation | Arquivos de desenvolvedor | C++ Resource Header Data | Microsoft Visual C++ | Microsoft Corporation |
| .RLS | Nokia | Arquivos de desenvolvedor | Symbian Localization File | Symbian SDK | Nokia |
| .RNW | Friedrich Leisch | Arquivos de desenvolvedor | Sweave Source File | Sweave | Friedrich Leisch |
| .RPJ | Uni Comp | Arquivos de desenvolvedor | Real Pac Batch Job File | Real Pac | Uni Comp |
| .RPTLIBRARY | The Eclipse Foundation | Arquivos de desenvolvedor | Report Design Library File | BIRT | Open Source |
| .RPY | Team Shanghai Alice | Arquivos de desenvolvedor | Touhou Project Replay File | Touhou Project | Team Shanghai Alice |
| .RQB | William Yu | Arquivos de desenvolvedor | RapidQ Quellcode File | PSPad | Open Source |
| .RS | Pierre-Emmanuel Gougelet | Arquivos de desenvolvedor | Sun Raster Bitmap Image | XnView MP | XnSoft |
| .RSRC | Apple | Arquivos de desenvolvedor | Macintosh Resource File | Mathemaesthetics Resorcerer | Mathemaesthetics |
| .RSS | Various Developers | Arquivos de desenvolvedor | Rich Site Summary | Mozilla Firefox | Mozilla |
| .RTS | Heaventools Software | Arquivos de desenvolvedor | Resource Tuner Console Script | Resource Tuner Console | Heaventools Software |
| .RU | Microsoft Corporation | Arquivos de desenvolvedor | Russian Text Or Localization File | Microsoft Notepad | Microsoft Corporation |
| .RUL | Flexera Software | Arquivos de desenvolvedor | InstallShield Rules File | InstallShield | Flexera Software |
| .RVB | McNeel | Arquivos de desenvolvedor | Rhino 3D Visucal Basic Script File | McNeel Rhino | McNeel |
| .S | Unknown Developer | Arquivos de desenvolvedor | Source Code File | Microsoft Notepad | Microsoft Corporation |
| .S19 | Motorola | Arquivos de desenvolvedor | Motorola EEPROM Programming Data | Sublime Text | Sublime HQ Pty Ltd |
| .S43 | IAR Systems | Arquivos de desenvolvedor | IAR Assembly Source | IAR Embedded Workbench | IAR Systems |
| .S4E | GMO Cloud KK | Arquivos de desenvolvedor | Airplay SDK Header File | Marmalade SDK | GMO Cloud KK |
| .SAL | Oracle Corporation | Arquivos de desenvolvedor | SQL Application Language Source Code | MySQL | Oracle Corporation |
| .SANTEM | ifu Hamburg GmbH | Arquivos de desenvolvedor | e!Sankey Template File | e!Sankey | ifu Hamburg GmbH |
| .SAS | SAS Institute Inc. | Arquivos de desenvolvedor | SAS Program File | SAS | SAS Institute Inc. |
| .SASF | NASA | Arquivos de desenvolvedor | NASA Spacecraft Activity Sequence | Unknown Software | Unknown Developer |
| .SAX | Open Source | Arquivos de desenvolvedor | Sedona Framework XML Application | Sedona Framework | Open Source |
| .SB | MIT Media Lab | Arquivos de desenvolvedor | Scratch Project File | MIT Scratch | MIT Media Lab |
| .SB2 | MIT Media Lab | Arquivos de desenvolvedor | Scratch 2.0 Project File | MIT Scratch | MIT Media Lab |
| .SB5 | Lindersoft | Arquivos de desenvolvedor | SetupBuilder 5 Installation Script | SetupBuilder | Lindersoft |
| .SBI | Creative Technology Ltd. | Arquivos de desenvolvedor | Sound Blaster Instrument | Virtual Sound Blaster | Creative Technology Ltd. |
| .SBR | Microsoft Corporation | Arquivos de desenvolvedor | Visual Studio Source Browser Intermediate File | Microsoft Visual Studio | Microsoft Corporation |
| .SC | Vladimir Romanyuk | Arquivos de desenvolvedor | Space Engine Script | Space Engine | Vladimir Romanyuk |
| .SCALA | Scala | Arquivos de desenvolvedor | Scala Source Code File | Scala IDE for Eclipse | Scala |
| .SCC | Microsoft Corporation | Arquivos de desenvolvedor | SourceSafe Source Code Control File | Microsoft Visual Studio | Microsoft Corporation |
| .SCX | RIX SoftWorks, Inc. | Arquivos de desenvolvedor | ColoRIX Bitmap Graphic File | XnView MP | XnSoft |
| .SDEF | Apple | Arquivos de desenvolvedor | AppleScript Dictionary Document | Apple Xcode | Apple |
| .SDI | Intuit, Inc. | Arquivos de desenvolvedor | QuickBooks Data File | Intuit QuickBooks Pro | Intuit, Inc. |
| .SDL | Microsoft Corporation | Arquivos de desenvolvedor | Service Description Language File | Safari | Apple |
| .SED | Microsoft Corporation | Arquivos de desenvolvedor | IExpress Self Extraction Directive File | Microsoft IExpress Wizard | Microsoft Corporation |
| .SEM | Alpha Software | Arquivos de desenvolvedor | Alpha Five Set Data Dictionary Memo File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SET | Xerox | Arquivos de desenvolvedor | Document Library Property Set File | Xerox Library Administration Tool | Fuji Xerox |
| .SETUP | Crytek | Arquivos de desenvolvedor | CryENGINE Character Setup File | Crytek CryENGINE SDK | Crytek |
| .SEX | Alpha Software | Arquivos de desenvolvedor | Alpha Five Set Data Dictionary Index File | Alpha Anywhere - Alpha Software | Alpha Software |
| .SF | Institut de Recherche et de Coordination Acoustique/Musique (IRCAM) | Arquivos de desenvolvedor | IRCAM Sound File | Awave Studio | FMJ-Software |
| .SH | Unknown Developer | Arquivos de desenvolvedor | Bash Shell Script | Notepad++ | Don Ho |
| .SHPROJ | Microsoft Corporation | Arquivos de desenvolvedor | Visual Studio Code Sharing App Project File | Microsoft Visual Studio | Microsoft Corporation |
| .SLL | ShopTalk Systems | Arquivos de desenvolvedor | Static Link Library | Shoptalk Systems Just BASIC | ShopTalk Systems |
| .SLN | Microsoft Corporation | Arquivos de desenvolvedor | Microsoft Visual Studio Solution File | VSoft Technologies FinalBuilder | VSoft Technologies |
| .SM | Open Source | Arquivos de desenvolvedor | StepMania Song File | StepMania | Open Source |
| .SMA | Don Ho | Arquivos de desenvolvedor | C/C++ Source Code File | MacroMates TextMate | MacroMates |
| .SMF | Oracle Corporation | Arquivos de desenvolvedor | StarMath Formula File | Apache OpenOffice | Apache Software Foundation |
| .SML | ESRI | Arquivos de desenvolvedor | ARC/INFO Simple Macro Language File | ESRI ArcGIS for Desktop | ESRI (Environmental Systems Research Institute) |
| .SMW | Crestron Electronics | Arquivos de desenvolvedor | SIMPL Windows Source File | SIMPL Windows | Crestron Electronics |
| .SNIPPET | Microsoft Corporation | Arquivos de desenvolvedor | Visual Studio IntelliSense Code Snippet | Microsoft Visual Studio | Microsoft Corporation |
| .SO | GNU Project | Arquivos de desenvolvedor | Shared Library | GNU Compiler Collection (GCC) | GNU Project |
| .SPEC | Open Source | Arquivos de desenvolvedor | RPM Specification File | Notepad++ | Don Ho |
| .SPT | Interactive Data Visualization, Inc. | Arquivos de desenvolvedor | SpeedTree Tree Data File | SpeedTree Architect | Interactive Data Visualization, Inc. |
| .SPYX | Sage | Arquivos de desenvolvedor | Sage Compiled Source Code | Sage One | Sage |
| .SQC | SAP | Arquivos de desenvolvedor | SQL Common Code Data | SQL Anywhere | SAP |
| .SQLPROJ | Microsoft Corporation | Arquivos de desenvolvedor | Microsoft Visual Studio SQL Server Project | Microsoft Visual Studio | Microsoft Corporation |
| .SQML | Open Source | Arquivos de desenvolvedor | Standard Query Markup Language Document | SQML | Open Source |
| .SRA | Sybase, Inc | Arquivos de desenvolvedor | PowerBuilder Application | PowerBuilder | SAP |
| .SRC | Unknown Developer | Arquivos de desenvolvedor | Source Code File | Microsoft Notepad | Microsoft Corporation |
| .SRJ | Sybase, Inc | Arquivos de desenvolvedor | PowerBuilder Extension File | PowerBuilder | SAP |
| .SRQ | Microsoft Corporation | Arquivos de desenvolvedor | Microsoft Windows Server Unprocessed Request File | Microsoft Windows Server 2016 | Microsoft Corporation |
| .SRU | Sybase, Inc | Arquivos de desenvolvedor | PowerBuilder User Object | PowerBuilder | SAP |
| .SRZ | Data Access Worldwide | Arquivos de desenvolvedor | DataFlex Source Code | DataFlex | Data Access Worldwide |
| .SS | Open Source | Arquivos de desenvolvedor | SilverStripe Source Code File | SilverStripe | Open Source |
| .SSC | Microsoft Corporation | Arquivos de desenvolvedor | SourceSafe Status File | Microsoft Visual Studio | Microsoft Corporation |
| .SSI | Adobe Systems Incorporated | Arquivos de desenvolvedor | Adobe Dreamweaver Server Side Include File | Adobe Dreamweaver | Adobe Systems Incorporated |
| .SSQ | Microsoft Corporation | Arquivos de desenvolvedor | ODBC Script File | Microsoft ODBC Data Source Administrator | Microsoft Corporation |
| .STS | DuoS DSEMU | Arquivos de desenvolvedor | DuoS DSEMU Saved State File | DuoS DSEMU | Unknown Developer |
| .SUBLIME-BUILD | Sublime HQ Pty Ltd | Arquivos de desenvolvedor | Sublime Text Build Data | Sublime Text | Sublime HQ Pty Ltd |
| .SUD | Aivosto Oy | Arquivos de desenvolvedor | Super Project Analyzer Data File | Super Project Analyzer | Aivosto Oy |
| .SUO | Microsoft Corporation | Arquivos de desenvolvedor | Visual Studio Solution User Options File | Microsoft Visual Studio | Microsoft Corporation |
| .SUP | Unknown Developer | Arquivos de desenvolvedor | Subtitle Bitmap File | IfoEdit | Open Source |
| .SUS | SAP | Arquivos de desenvolvedor | SAP Transactionware GM POS Xpress Suspended Data | SAP BusinessObjects Business Intelligence | SAP |
| .SVB | StatSoft, Inc. | Arquivos de desenvolvedor | Statistica Macro File | STATISTICA | StatSoft, Inc. |
| .SVH | IEEE Xplore | Arquivos de desenvolvedor | SystemVerilog Source Code Header File | Microsoft Notepad | Microsoft Corporation |
| .SVX | The Survex Project | Arquivos de desenvolvedor | Survex Cavern Data File | Microsoft Notepad | Microsoft Corporation |
| .SWC | Adobe Systems Incorporated | Arquivos de desenvolvedor | Flex Components Archive | Adobe Animate CC 2017 | Adobe Systems Incorporated |
| .SWD | Adobe Systems Incorporated | Arquivos de desenvolvedor | Flash Debug File | Adobe Flash Player | Adobe Systems Incorporated |
| .SXS | SAS Institute Inc. | Arquivos de desenvolvedor | SAS Stat Studio Module Source Code File | SAS | SAS Institute Inc. |
| .SYM | The Eclipse Foundation | Arquivos de desenvolvedor | Symbols File | Eclipse CDT | The Eclipse Foundation |
| .T | Holt Software | Arquivos de desenvolvedor | Turing Source Code File | Holt Software Turing | Holt Software |
| .TAL | Adobe Systems Incorporated | Arquivos de desenvolvedor | Adobe TypeAlign Text Illustration File | Adobe TypeAlign | Adobe Systems Incorporated |
| .TCL | Open Source | Arquivos de desenvolvedor | Tcl Script | MacroMates TextMate | MacroMates |
| .TDS | Borland | Arquivos de desenvolvedor | Turbo Debugger Symbols File | Borland Turbo Debugger | Borland |
| .TESTSETTINGS | Microsoft Corporation | Arquivos de desenvolvedor | Visual Studio Test Settings File | Microsoft Visual Studio | Microsoft Corporation |
| .TEXINFO | GNU Project | Arquivos de desenvolvedor | Texinfo Source Data | LaTex | Leslie Lamport |
| .TFP | Schneider Electric | Arquivos de desenvolvedor | ProWORX Nxt Full Page Data File | ProWORX | Schneider Electric |
| .TGML | Unknown Developer | Arquivos de desenvolvedor | Tecumseh Group Markup Language Source Code | Microsoft Notepad | Microsoft Corporation |
| .THML | Unknown Developer | Arquivos de desenvolvedor | Theological HTML Document | Theological Markup Language (ThML) | Unknown Developer |
| .THOR | Sublime HQ Pty Ltd | Arquivos de desenvolvedor | Thor Source Code | Notepad++ | Don Ho |
| .TI | timber-lang.org | Arquivos de desenvolvedor | Timber Compiler | Timber | timber-lang.org |
| .TIG | Texas Instruments, Inc. | Arquivos de desenvolvedor | TI Connect Backup File | Smith Micro StuffIt Deluxe | Smith Micro Software |
| .TIK | Unknown Developer | Arquivos de desenvolvedor | Script File For Game Textures | Unknown Software | Unknown Developer |
| .TK | Procedimientos-Uno, S.L. | Arquivos de desenvolvedor | TeKton3D Project | TeKton3D | Procedimientos-Uno, S.L. |
| .TKN | ShopTalk Systems | Arquivos de desenvolvedor | Liberty BASIC Application Distribution | Liberty Basic | ShopTalk Systems |
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