| srq | Sybase PowerBuilder Query Object |
| srs | Sybase PowerBuilder Structure |
| sru | Sybase PowerBuilder User Object |
| srw | Sybase PowerBuilder Window |
| srz | DataFlex Source Code |
| ss | Scheme Source Code |
| SilverStripe Source Code |
| ss2 | SAS Stored Program |
| ss7 | SAS Stored Program |
| ssc | Esterel Sorted Circuit Code |
| Stellarium Script |
| Visual SourceSafe Status File |
| ssdl | Store Schema Definition Language Data |
| ssmssln | SQL Server Management Studio Solution |
| ssp | Scala Server Page |
| ssq | ODBC Script |
| SAS 6 Sequential Engine Stored Program |
| sss | Coda Style Sheet |
| ssv | Uniface Session Service Data |
| ssx | IBM Rational XDE SSX Data |
| VersaPro Smart Store Document |
| ssy | IBM Rational SDL Suite Diagram |
| st | LittleSmalltalk Source Code |
| OpenEdge ABL Structure Definition |
| stex | Godot Engine Stream Texture Data |
| stf | ISaGRAF Program Organization Unit |
| stl | Visual Studio C++ Standard Template Library |
| story | Indigo Studio Story Data |
| storyboard | Xcode Interface Builder Storyboard |
| stp | HTML Help Stop Words |
| Microsoft Sharepoint Site Template |
| strings | Mac OS X Strings Resource File |
| strl | Esterel Source Code |
| sts | Squeak Source Code |
| stub | Mac OS X Stub Library |
| sty | WinDev Style Data |
| styl | Stylus CSS Script |
| su2 | SAS Utility |
| su7 | SAS Utility |
| sum | Scilab Unit Operation Model |
| Stata Checksum File |
| summ | Clapack Blas Testing Data |
| suo | Visual Studio Solution User Options |
| sv | SystemVerilog File |
| svc | Microsoft IIS Special Content File |
| Uniface Service Data |
| svcinfo | Visual Studio WCF Service Information File |
| svclog | WCF Service Trace Viewer Log |
| svcmap | Visual Studio WCF Service Map File |
| svd | CMSIS System View Description Data |
| svdl | Security Validation Description Language Document |
| svelte | Svelte Source Code |
| svf | Xilinx ISE NetGen Assertion Data |
| svh | SystemVerilog Include File |
| svn | Subversion Data File |
| svn-base | Subversion Base Data |
| svn-work | Subversion Cache |
| svntmp | Subversion Temporary Data |
| svq | SAS 6 Sequential Engine View Data |
| sw | Free Pascal Assembler Data |
| swag | Swag Data |
| swc | Shockwave Flash Component Data |
| swd | Shockwave Flash Debug |
| swe | Siebel Web Engine Data |
| swift | Swift Source Code |
| swiftpm | Swift Package Manager Data |
| swp | Omron Syswin API Description |
| swt | Shockwave Flash Template |
| Visual Basic Setup Wizard Template |
| sxp | OpenOffice.org Script |
| syds | Essential Studio Data Sources Data |
| sydx | Syncfusion Dashboard Data |
| sym | Borland C++ Precompiled Header |
| syn | WinDev Synchronization Data |
| sync | Visual Studio Sync Data |
| syp | SYP Script |
| sysml | Systems Modeling Language Document |
| systag | Android System Tag Data |
| syt | Sytes Template File |
| syx | Modula-2 Software Development System SYX Data |
