| str | Altair FEKO Solution Vector Data |
| Avantes Avasoft v8 Single Data |
| DataPerfect Structural Information Data |
| dBASE Structure Object |
| eSignal Story Data |
| Ribbons STR Data |
| STATISTICA Report File |
| STELLA Runtime |
| Surpac Vision Data Repository |
| ZENworks Client Inventory Data |
| string | UltraEdit String Data |
| Zoom Player General Text Data |
| strn | HyperCard Stack Converter Data |
| sts | #TASK Script |
| AdriPSX Save State |
| DuoS DSEMU Saved State |
| MemMaker Status Information File |
| Nimbus 7 SAMS Status Data |
| stsp | ScanTango Scanner Plug-in |
| stt | Kaspersky Anti-virus Statistics Data |
| SPSS Table Template |
| Streets & Trips Map Template |
| stu | xyAlgebra STU Data |
| stuffittask | StuffIt Scheduler Task Data |
| stv | SofTV Author File |
| stw | SampleTank User Sample Data |
| STATISTICA Workbook Data |
| stx | EditPlus Syntax Data |
| SAS XPORT Transport File |
| Scream Tracker Music Interface Kit |
| SimplexNumerica Template |
| SPOT Satellite Image Statistics Data |
| Stitch Vista Expanded Data |
| StockChartX Data |
| sty | Aegisub Subtitle Styles Data |
| Band-in-a-Box Styles Data |
| Micrografx Picture Publisher Print Style |
| Microsoft Word for DOS Style Sheet Data |
| Tecplot 360 Style Data |
| styk | Stykz Stick Figure |
| stykz | Stykz Animation File |
| style | Genetica Visual Style Data |
| SketchUp Style Data |
| styles | Steam Client GUI Resources Data |
| styx | ChordWizard Songtrix Style Data |
| styxml | Autodesk Inventor Exported Style Data |
| su2 | I2P Software Update File |
| su3 | I2P Software Update File |
| Su3De Data |
| sua | Tim Newport-Peace Special Use Airspace Format File |
| sub | IBM Rational Rose Component Package |
| Insight II Subset Definition |
| SWAT Subbasin Input Data |
| WRAP SIMD Sub-monthly Time Step Simulation Data |
| sublime-build | Sublime Text Build Data |
| sublime-keymap | Sublime Text Keymap Data |
| sublime-menu | Sublime Text Menu Data |
| sublime-options | Sublime Text Options Data |
| sublime-package | Sublime Text Package Data |
| sublime-session | Sublime Text Session Data |
| sublime-settings | Sublime Text Settings Data |
| sublime-snippet | Sublime Text Snippet Data |
| sublime-theme | Sublime Text Theme Data |
| subs | AvantGo Subscription Data |
| substvar | TIBCO BusinessWorks Substitution Variable Data |
| subtitle | TMPGEnc DVD Author Subtitle Data |
| suc | Softrans Hello Engines! Data |
| sucatalog | Mac OS X Software Update Catalog |
| success | WOW! Diagnostic Log Data |
| sud | Carlson 2016 Super Elevation Diagram Data |
| I2P Software Update File |
| Scream SUD Data |
| Super Project Data |
| suf | ZENworks Endpoint Security Management Import File |
| sug | Vim Spelling SUG Data |
| sui | StarSplatter User Interface |
| suite | Theme Manager Data |
| suj | Stacker Unlimited Job |
| sum | BSL Sum Data |
| sump | Easy Palette Library |
