| .SCRIPT | Unknown Developer | Ficheiros Executáveis | Generic Script File | LibreOffice | The Document Foundation |
| .SDA | Oracle Corporation | Ficheiros de Imagem de Vetor | StarOffice Drawing | LibreOffice | The Document Foundation |
| .SDC | Stardock Corporation | Ficheiros de Cópia de Segurança | Stardock Central Download Archive | LibreOffice | The Document Foundation |
| .SDD | Programming Sunrise | Ficheiros de Dados | Smart Diary Suite Data File | LibreOffice | The Document Foundation |
| .SDP | Oracle Corporation | Ficheiros de Dados | StarOffice Presentation File | LibreOffice | The Document Foundation |
| .SDV | Pinnacle Systems Inc. | Ficheiros de Vídeo | Studio DV Project File | LibreOffice | The Document Foundation |
| .SDW | LizardTech | Ficheiros GIS | MrSID World File | LibreOffice | The Document Foundation |
| .SHT | The Document Foundation | Ficheiros Web | HTML File With Server Side Includes | LibreOffice | The Document Foundation |
| .SMF | Oracle Corporation | Ficheiros de Texto | StarMath Formula File | LibreOffice | The Document Foundation |
| .SMS | Sega | Ficheiros de Jogo | Sega Master System ROM | LibreOffice | The Document Foundation |
| .SSC | Microsoft Corporation | Ficheiros de Desenvolvedor | SourceSafe Status File | LibreOffice | The Document Foundation |
| .STC | Adobe Systems Incorporated | Ficheiros Web | Contribute Connection Key File | LibreOffice | The Document Foundation |
| .STD | Oracle Corporation | Ficheiros de Imagem de Vetor | Apache OpenOffice Drawing Template | LibreOffice | The Document Foundation |
| .STI | Oracle Corporation | Ficheiros de Dados | StarOffice Presentation Template | LibreOffice | The Document Foundation |
| .STM | Microsoft Corporation | Ficheiros de Dados | Exchange Streaming Media File | LibreOffice Calc | The Document Foundation |
| .STW | Oracle Corporation | Ficheiros de Texto | StarOffice Document Template | LibreOffice | The Document Foundation |
| .SVM | Star Division | Ficheiros de Imagem Raster | StarView Metafile | LibreOffice | The Document Foundation |
| .SXC | Sun Microsystems | Ficheiros de Folha de Cálculo | StarOffice Calc Spreadsheet | LibreOffice Calc | The Document Foundation |
| .SXD | ESRI | Ficheiros GIS | ArcScene Document | LibreOffice | The Document Foundation |
| .SXG | Oracle Corporation | Ficheiros de Texto | Apache OpenOffice Master Document | LibreOffice | The Document Foundation |
| .SXI | Oracle Corporation | Ficheiros de Dados | StarOffice Impress Presentation | LibreOffice | The Document Foundation |
| .SXW | Oracle Corporation | Ficheiros de Texto | StarOffice Writer Document | LibreOffice | The Document Foundation |
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