| .SDC | Stardock Corporation | Backup Files | Stardock Central Download Archive | Apache OpenOffice | Apache Software Foundation |
| .SDD | Programming Sunrise | Data Files | Smart Diary Suite Data File | Apache OpenOffice | Apache Software Foundation |
| .SDI | Intuit, Inc. | Data Files | QuickBooks Data File | Apache OpenOffice | Apache Software Foundation |
| .SDP | Oracle Corporation | Data Files | StarOffice Presentation File | Apache OpenOffice | Apache Software Foundation |
| .SDS | Oracle Corporation | Data Files | OpenOffice.org Chart | Apache OpenOffice | Apache Software Foundation |
| .SDV | Pinnacle Systems Inc. | Video Files | Studio DV Project File | Apache OpenOffice | Apache Software Foundation |
| .SDW | LizardTech | GIS Files | MrSID World File | Apache OpenOffice | Apache Software Foundation |
| .SFS | Open Source | Compressed Files | Squashfs File Archive | Apache OpenOffice | Apache Software Foundation |
| .SILK | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Symbolic Link Format | Apache OpenOffice Calc | Apache Software Foundation |
| .SKI | Motorola | Settings Files | Motorola Phone Skin File | Apache OpenOffice | Apache Software Foundation |
| .SKV | Microsoft Corporation | Data Files | Semicolon Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .SMF | Oracle Corporation | Text Files | StarMath Formula File | Apache OpenOffice | Apache Software Foundation |
| .SMS | Sega | Game Files | Sega Master System ROM | Apache OpenOffice | Apache Software Foundation |
| .SOB | Apache Software Foundation | Raster Image Files | OpenOffice.org Impress Bimap Styles File | Apache OpenOffice | Apache Software Foundation |
| .SOC | Apache Software Foundation | Settings Files | OpenOffice.org Configuration File | Apache OpenOffice | Apache Software Foundation |
| .SOD | id Software | Game Files | Spear Of Destiny Data File | Apache OpenOffice | Apache Software Foundation |
| .SOF | Apache Software Foundation | Data Files | Colour Palettes And Various Style Elements File | Apache OpenOffice | Apache Software Foundation |
| .SOG | Apache Software Foundation | Data Files | Apache OpenOffice (OpenOffice.org) Colour Palettes | Apache OpenOffice | Apache Software Foundation |
| .SRS | Microsoft Corporation | Settings Files | Outlook Send/Receive Settings File | Apache OpenOffice | Apache Software Foundation |
| .STC | Adobe Systems Incorporated | Web Files | Contribute Connection Key File | Apache OpenOffice | Apache Software Foundation |
| .STD | Oracle Corporation | Vector Image Files | Apache OpenOffice Drawing Template | Apache OpenOffice | Apache Software Foundation |
| .STE | Adobe Systems Incorporated | Settings Files | Dreamweaver Site Settings File | OpenOffice Writer | Apache Software Foundation |
| .STI | Oracle Corporation | Data Files | StarOffice Presentation Template | Apache OpenOffice | Apache Software Foundation |
| .STM | Microsoft Corporation | Data Files | Exchange Streaming Media File | Apache OpenOffice Calc | Apache Software Foundation |
| .STW | Oracle Corporation | Text Files | StarOffice Document Template | Apache OpenOffice | Apache Software Foundation |
| .SVM | Star Division | Raster Image Files | StarView Metafile | Apache OpenOffice | Apache Software Foundation |
| .SVN | Apache Software Foundation | Data Files | Subversion Data File | Subversion | Apache Software Foundation |
| .SWX | Apache Software Foundation | Text Files | OpenOffice.org 1.0 Text Document | Apache OpenOffice | Apache Software Foundation |
| .SXC | Sun Microsystems | Spreadsheet Files | StarOffice Calc Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .SXD | ESRI | GIS Files | ArcScene Document | Apache OpenOffice | Apache Software Foundation |
| .SXG | Oracle Corporation | Text Files | Apache OpenOffice Master Document | Apache OpenOffice | Apache Software Foundation |
| .SXI | Oracle Corporation | Data Files | StarOffice Impress Presentation | Apache OpenOffice | Apache Software Foundation |
| .SXW | Oracle Corporation | Text Files | StarOffice Writer Document | Apache OpenOffice | Apache Software Foundation |
| .THM | Sony | Uncommon Files | Sony Ericsson Mobile Phone Theme File | Apache OpenOffice | Apache Software Foundation |
| .TIS | Acronis | Backup Files | True Image Script | Apache Lucene | Apache Software Foundation |
| .TML | Odetics Broadcast | Data Files | AIRO Timeline File Format | Apache Tapestry | Apache Software Foundation |
| .TSV | Unknown Developer | Data Files | Tab Separated Values File | Apache OpenOffice | Apache Software Foundation |
| .TVX | Doug Cutting | Uncommon Files | Apache Lucene Term Vector Index File | Apache Lucene | Apache Software Foundation |
| .UOF | The Document Foundation | Text Files | Uniform Office Document | Apache OpenOffice | Apache Software Foundation |
| .URD | Kinook Software, Inc. | Database Files | Ultra Recall Database File | Apache OpenOffice | Apache Software Foundation |
| .UZN | Apache Software Foundation | Data Files | Tesseract-Migneuzn Tool Output File | Tesseract-OCR | Apache Software Foundation |
| .VOR | Sun Microsystems | Uncommon Files | StarOffice Template | Apache OpenOffice | Apache Software Foundation |
| .VSDX | Microsoft Corporation | Vector Image Files | Visio Drawing | Apache OpenOffice | Apache Software Foundation |
| .WAR | Oracle Corporation | Compressed Files | Java Web Archive | Apache Tomcat | Apache Software Foundation |
| .WK! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .WK1 | IBM | Data Files | Lotus Worksheet | Apache OpenOffice Calc | Apache Software Foundation |
| .WKE | IBM | Spreadsheet Files | Lotus 1-2-3 Educational Version Worksheet | Apache OpenOffice | Apache Software Foundation |
| .WN | WN | Web Files | WN Web File | OpenOffice Writer | Apache Software Foundation |
| .WR! | IBM | Spreadsheet Files | Lotus 1-2-3 Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .XBA | Oracle Corporation | Plugin Files | OpenOffice.org Basic Module File | Apache OpenOffice | Apache Software Foundation |
| .XCU | Apache Software Foundation | Settings Files | OpenOffice.org Configuration File | Apache OpenOffice | Apache Software Foundation |
| .XLB | Microsoft Corporation | Settings Files | Excel Toolbars File | Apache OpenOffice | Apache Software Foundation |
| .XLS | Microsoft Corporation | Spreadsheet Files | Microsoft Excel 97 To 2003 Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .XLSB | Microsoft Corporation | Spreadsheet Files | Excel Binary Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .XLSM | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Macro-Enabled Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .XLSX | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Spreadsheet | Apache OpenOffice | Apache Software Foundation |
| .Y | Microsoft Corporation | Raster Image Files | Subsampled Raw YUV Image | OpenOffice Writer | Apache Software Foundation |
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