| .SBL | Adobe Systems Incorporated | Ficheiros Gráficos | Shockwave Flash Object | Apache OpenOffice | Apache Software Foundation |
| .SDA | Oracle Corporation | Ficheiros de Imagem de Vetor | StarOffice Drawing | Apache OpenOffice | Apache Software Foundation |
| .SDC | Stardock Corporation | Ficheiros de Cópia de Segurança | Stardock Central Download Archive | Apache OpenOffice | Apache Software Foundation |
| .SDD | Programming Sunrise | Ficheiros de Dados | Smart Diary Suite Data File | Apache OpenOffice | Apache Software Foundation |
| .SDI | Intuit, Inc. | Ficheiros de Dados | QuickBooks Data File | Apache OpenOffice | Apache Software Foundation |
| .SDP | Oracle Corporation | Ficheiros de Dados | StarOffice Presentation File | Apache OpenOffice | Apache Software Foundation |
| .SDS | Oracle Corporation | Ficheiros de Dados | OpenOffice.org Chart | Apache OpenOffice | Apache Software Foundation |
| .SDV | Pinnacle Systems Inc. | Ficheiros de Vídeo | Studio DV Project File | Apache OpenOffice | Apache Software Foundation |
| .SDW | LizardTech | Ficheiros GIS | MrSID World File | Apache OpenOffice | Apache Software Foundation |
| .SFS | Open Source | Ficheiros Compactados | Squashfs File Archive | Apache OpenOffice | Apache Software Foundation |
| .SKI | Motorola | Ficheiros de Configurações | Motorola Phone Skin File | Apache OpenOffice | Apache Software Foundation |
| .SKV | Microsoft Corporation | Ficheiros de Dados | Semicolon Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .SMF | Oracle Corporation | Ficheiros de Texto | StarMath Formula File | Apache OpenOffice | Apache Software Foundation |
| .SMS | Sega | Ficheiros de Jogo | Sega Master System ROM | Apache OpenOffice | Apache Software Foundation |
| .SOB | Apache Software Foundation | Ficheiros de Imagem Raster | OpenOffice.org Impress Bimap Styles File | Apache OpenOffice | Apache Software Foundation |
| .SOC | Apache Software Foundation | Ficheiros de Configurações | OpenOffice.org Configuration File | Apache OpenOffice | Apache Software Foundation |
| .SOD | id Software | Ficheiros de Jogo | Spear Of Destiny Data File | Apache OpenOffice | Apache Software Foundation |
| .SOF | Apache Software Foundation | Ficheiros de Dados | Colour Palettes And Various Style Elements File | Apache OpenOffice | Apache Software Foundation |
| .SOG | Apache Software Foundation | Ficheiros de Dados | Apache OpenOffice (OpenOffice.org) Colour Palettes | Apache OpenOffice | Apache Software Foundation |
| .SRS | Microsoft Corporation | Ficheiros de Configurações | Outlook Send/Receive Settings File | Apache OpenOffice | Apache Software Foundation |
| .STC | Adobe Systems Incorporated | Ficheiros Web | Contribute Connection Key File | Apache OpenOffice | Apache Software Foundation |
| .STD | Oracle Corporation | Ficheiros de Imagem de Vetor | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STI | Oracle Corporation | Ficheiros de Dados | StarOffice Presentation Template | Apache OpenOffice | Apache Software Foundation |
| .STW | Oracle Corporation | Ficheiros de Texto | StarOffice Document Template | Apache OpenOffice | Apache Software Foundation |
| .SVM | Star Division | Ficheiros de Imagem Raster | StarView Metafile | Apache OpenOffice | Apache Software Foundation |
| .SWX | Apache Software Foundation | Ficheiros de Texto | OpenOffice.org 1.0 Text Document | Apache OpenOffice | Apache Software Foundation |
| .SXD | ESRI | Ficheiros GIS | ArcScene Document | Apache OpenOffice | Apache Software Foundation |
| .SXG | Oracle Corporation | Ficheiros de Texto | Apache OpenOffice Master Document | Apache OpenOffice | Apache Software Foundation |
| .SXI | Oracle Corporation | Ficheiros de Dados | StarOffice Impress Presentation | Apache OpenOffice | Apache Software Foundation |
| .SXW | Oracle Corporation | Ficheiros de Texto | StarOffice Writer Document | Apache OpenOffice | Apache Software Foundation |
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