| sqt | Compiled SQR Script |
| src | ProWorx NXT Search Data |
| src | General Source Code File |
| srd | Sybase PowerBuilder DataWindow |
| sre | Windows CE Embedded Rom Image |
| srm | Sybase PowerBuilder Menu |
| srq | Sybase PowerBuilder Query Object |
| srs | Sybase PowerBuilder Structure |
| sru | Sybase PowerBuilder User Object |
| srw | Sybase PowerBuilder Window |
| srz | DataFlex Source Code |
| ss2 | SAS Stored Program |
| ss7 | SAS Stored Program |
| ssc | Visual SourceSafe Status File |
| ssc | Esterel Sorted Circuit Code |
| ssmssln | SQL Server Management Studio Solution |
| ssq | ODBC Script |
| ssx | VersaPro Smart Store Document |
| ssy | IBM Rational SDL Suite Diagram |
| storyboard | Xcode Interface Builder Storyboard |
| stp | Microsoft Sharepoint Site Template |
| stp | HTML Help Stop Words |
| strings | Mac OS X Strings Resource File |
| strl | Esterel Source Code |
| sts | Squeak Source Code |
| stub | Mac OS X Stub Library |
| su2 | SAS Utility |
| su7 | SAS Utility |
| sum | Stata Checksum File |
| suo | Visual Studio Solution User Options |
| sv | SystemVerilog File |
| svc | Microsoft IIS Special Content File |
| svcinfo | Visual Studio WCF Service Information File |
| svclog | WCF Service Trace Viewer Log |
| svcmap | Visual Studio WCF Service Map File |
