| .S11 | Interplay Entertainment | Pelitiedostot | Descent 2 Game Data | Unsealer | Oracle Corporation |
| .S1A | Oracle Corporation | Koodatut tiedostot | Sealed Acrobat Document | Unsealer | Oracle Corporation |
| .S1E | SealedMedia | Koodatut tiedostot | Sealed Excel Worksheet File | Unsealer | Oracle Corporation |
| .S1M | Yamaha Corporation | Äänitiedostot | Yamaha EX5 Waveform Data | Unsealer | Oracle Corporation |
| .S1N | SealedMedia | Salatut Tiedostot | Sealed PNG Graphic File | Unsealer | Oracle Corporation |
| .SAL | Oracle Corporation | Sovelluskehittäjän tiedostot | SQL Application Language Source Code | MySQL | Oracle Corporation |
| .SDA | Oracle Corporation | Vektorikuvatiedostot | StarOffice Drawing | StarOffice | Oracle Corporation |
| .SDD | Programming Sunrise | Datatiedostot | Smart Diary Suite Data File | StarOffice | Oracle Corporation |
| .SDG | Golden Software LLC | CAD-tiedostot | Strater Project File | StarOffice | Oracle Corporation |
| .SDM | Oracle Corporation | Tekstitiedostot | StarOffice Mail Message | StarOffice | Oracle Corporation |
| .SDOC | Samsung Electronics | Datatiedostot | Samsung Memo File | Oracle IRM Desktop | Oracle Corporation |
| .SDP | Oracle Corporation | Datatiedostot | StarOffice Presentation File | StarOffice | Oracle Corporation |
| .SDS | Oracle Corporation | Datatiedostot | OpenOffice.org Chart | StarOffice | Oracle Corporation |
| .SECURITY | Oracle Corporation | Datatiedostot | Javasoft Jre 1.3 Lib Security Data | Java | Oracle Corporation |
| .SEM | Alpha Software | Sovelluskehittäjän tiedostot | Alpha Five Set Data Dictionary Memo File | Unsealer | Oracle Corporation |
| .SEML | Oracle Corporation | Harvinaiset Tiedostot | Sealed EML Document | Oracle IRM Desktop | Oracle Corporation |
| .SFS | Open Source | Pakatut tiedostot | Squashfs File Archive | StarOffice | Oracle Corporation |
| .SGV | Oracle Corporation | Graafiset Tiedostot | StarOffice StarDraw 2.0 Picture Image File | StarOffice | Oracle Corporation |
| .SIZ | Oracle Corporation | Asetustiedostot | Oracle 7 Configuration File | Oracle Database | Oracle Corporation |
| .SJP | Oracle Corporation | Koodatut tiedostot | Sealed JPG File | Oracle IRM Desktop | Oracle Corporation |
| .SJPG | Oracle Corporation | Koodatut tiedostot | Sealed JPG File | Oracle IRM Desktop | Oracle Corporation |
| .SMH | Oracle Corporation | Tekstitiedostot | Sealed MHT Document | Unsealer | Oracle Corporation |
| .SPD | AutoDesSys, Inc. | Harvinaiset Tiedostot | Form-Z Suspended Render Data | Unsealer | Oracle Corporation |
| .SPDF | Oracle Corporation | Koodatut tiedostot | Sealed PDF File | Oracle IRM Desktop | Oracle Corporation |
| .SPN | Corel | Asetustiedostot | Corel WordPerfect Distribution Definition | Unsealer | Oracle Corporation |
| .SPP | Serif | Rasterikuvatiedostot | Serif PhotoPlus Picture File | Unsealer | Oracle Corporation |
| .SPS | IBM | Datatiedostot | SPSS Program File | Oracle Database | Oracle Corporation |
| .SQL | Various Developers | Tietokantatiedostot | Structured Query Language Data File | MySQL | Oracle Corporation |
| .SQR | Oracle Corporation | Datatiedostot | SQL Program File | MySQL | Oracle Corporation |
| .SR | Sun Microsystems | Rasterikuvatiedostot | Sun Raster Image File | Sun Operating System | Oracle Corporation |
| .SSW | Sony Mobile Communications | Harvinaiset Tiedostot | Sony Ericsson Firmware File | Unsealer | Oracle Corporation |
| .STD | Oracle Corporation | Vektorikuvatiedostot | Apache OpenOffice Drawing Template | StarOffice | Oracle Corporation |
| .STI | Oracle Corporation | Datatiedostot | StarOffice Presentation Template | StarOffice | Oracle Corporation |
| .SUN | Sun Microsystems | Rasterikuvatiedostot | Sun Raster Graphic File | Sun Operating System | Oracle Corporation |
| .SXD | ESRI | GIS-tiedostot | ArcScene Document | StarOffice | Oracle Corporation |
| .SXG | Oracle Corporation | Tekstitiedostot | Apache OpenOffice Master Document | StarOffice | Oracle Corporation |
| .SXL | SealedMedia | Koodatut tiedostot | Sealed Excel Worksheet File | Unsealer | Oracle Corporation |
| .SXLS | Oracle Corporation | Työkirjatiedostot | Sealed Excel Spreadsheet | Oracle IRM Desktop | Oracle Corporation |
| .SXML | Oracle Corporation | Koodatut tiedostot | Sealed XML File | Oracle IRM Desktop | Oracle Corporation |
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