| .SBL | Adobe Systems Incorporated | Pliki graficzny | Shockwave Flash Object | Apache OpenOffice | Apache Software Foundation |
| .SCRIPT | Unknown Developer | Pliki wykonywalne | Generic Script File | OpenOffice Writer | Apache Software Foundation |
| .SDA | Oracle Corporation | Pliki z grafiką wektorową | StarOffice Drawing | Apache OpenOffice | Apache Software Foundation |
| .SDC | Stardock Corporation | Pliki kopii zapasowej | Stardock Central Download Archive | Apache OpenOffice | Apache Software Foundation |
| .SDD | Programming Sunrise | Pliki z danymi | Smart Diary Suite Data File | Apache OpenOffice | Apache Software Foundation |
| .SDI | Intuit, Inc. | Pliki z danymi | QuickBooks Data File | Apache OpenOffice | Apache Software Foundation |
| .SDP | Oracle Corporation | Pliki z danymi | StarOffice Presentation File | Apache OpenOffice | Apache Software Foundation |
| .SDS | Oracle Corporation | Pliki z danymi | OpenOffice.org Chart | Apache OpenOffice | Apache Software Foundation |
| .SDV | Pinnacle Systems Inc. | Pliki wideo | Studio DV Project File | Apache OpenOffice | Apache Software Foundation |
| .SDW | LizardTech | Pliki GIS | MrSID World File | Apache OpenOffice | Apache Software Foundation |
| .SFS | Open Source | Pliki skompresowane | Squashfs File Archive | Apache OpenOffice | Apache Software Foundation |
| .SILK | Microsoft Corporation | Pliki z arkuszami kalkulacyjnymi | Microsoft Excel Symbolic Link Format | Apache OpenOffice Calc | Apache Software Foundation |
| .SKI | Motorola | Pliki konfiguracyjne | Motorola Phone Skin File | Apache OpenOffice | Apache Software Foundation |
| .SKV | Microsoft Corporation | Pliki z danymi | Semicolon Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .SMF | Oracle Corporation | Pliki tekstowe | StarMath Formula File | Apache OpenOffice | Apache Software Foundation |
| .SMS | Sega | Pliki gier | Sega Master System ROM | Apache OpenOffice | Apache Software Foundation |
| .SOB | Apache Software Foundation | Pliki z grafiką rasterową | OpenOffice.org Impress Bimap Styles File | Apache OpenOffice | Apache Software Foundation |
| .SOC | Apache Software Foundation | Pliki konfiguracyjne | OpenOffice.org Configuration File | Apache OpenOffice | Apache Software Foundation |
| .SOD | id Software | Pliki gier | Spear Of Destiny Data File | Apache OpenOffice | Apache Software Foundation |
| .SOF | Apache Software Foundation | Pliki z danymi | Colour Palettes And Various Style Elements File | Apache OpenOffice | Apache Software Foundation |
| .SOG | Apache Software Foundation | Pliki z danymi | Apache OpenOffice (OpenOffice.org) Colour Palettes | Apache OpenOffice | Apache Software Foundation |
| .SRS | Microsoft Corporation | Pliki konfiguracyjne | Outlook Send/Receive Settings File | Apache OpenOffice | Apache Software Foundation |
| .STC | Adobe Systems Incorporated | Plik Web | Contribute Connection Key File | Apache OpenOffice | Apache Software Foundation |
| .STD | Oracle Corporation | Pliki z grafiką wektorową | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STE | Adobe Systems Incorporated | Pliki konfiguracyjne | Dreamweaver Site Settings File | OpenOffice Writer | Apache Software Foundation |
| .STI | Oracle Corporation | Pliki z danymi | StarOffice Presentation Template | Apache OpenOffice | Apache Software Foundation |
| .STM | Microsoft Corporation | Pliki z danymi | Exchange Streaming Media File | Apache OpenOffice Calc | Apache Software Foundation |
| .STW | Oracle Corporation | Pliki tekstowe | StarOffice Document Template | Apache OpenOffice | Apache Software Foundation |
| .SVM | Star Division | Pliki z grafiką rasterową | StarView Metafile | Apache OpenOffice | Apache Software Foundation |
| .SVN | Apache Software Foundation | Pliki z danymi | Subversion Data File | Subversion | Apache Software Foundation |
| .SWX | Apache Software Foundation | Pliki tekstowe | OpenOffice.org 1.0 Text Document | Apache OpenOffice | Apache Software Foundation |
| .SXC | Sun Microsystems | Pliki z arkuszami kalkulacyjnymi | StarOffice Calc Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .SXD | ESRI | Pliki GIS | ArcScene Document | Apache OpenOffice | Apache Software Foundation |
| .SXG | Oracle Corporation | Pliki tekstowe | Apache OpenOffice Master Document | Apache OpenOffice | Apache Software Foundation |
| .SXI | Oracle Corporation | Pliki z danymi | StarOffice Impress Presentation | Apache OpenOffice | Apache Software Foundation |
| .SXW | Oracle Corporation | Pliki tekstowe | StarOffice Writer Document | Apache OpenOffice | Apache Software Foundation |
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