| sct | Visual FoxPro Form Memo |
| scurl | Curl Source Code |
| scx | Microsoft Visual FoxPro Form |
| sdcl | SharpDevelop Control Library |
| sdef | AppleScript Dictionary Document |
| sdff | IBM SDK for Java System Dump |
| sdm | System Definition Model |
| sdq | SAS Data |
| sdt | IBM Rational SDL Suite Data |
| se | Shuttle Source |
| seam | Seam Framework Java Servlet |
| seestyle | Coda Style Sheet |
| seexpl | Spec Explorer Data |
| sem | Alpha Five Set Object |
| servoy | Servoy Archive |
| set | Alpha Five Set Data Dictionary |
| sex | Alpha Five Set Index |
| sexi | Alpha Five Set Index |
| sfd | µVision Intermediary Pseudo-XML Data |
| sfla | MATLAB Shuffled Frog-Leaping Algorithm Data |
| sflb | Sitefinity Library |
| sfr | µVision System Viewer Binary Data |
| sfr | IAR System Special Function Register Definitions Data |
| sfsm | SPLat Tabula File |
| sgd | VT Pro-e Smart Graphics Definitions Data |
| sgpbpr | SGP Baltie Program |
| sgpsc | SGP Baltie Scene |
| sh | Unix Shell Script |
| sho | Alpha Four Sort List |
| sig | Uniface Component Signature Data |
