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| Extension | File Type Developer | File Category | File Type Description | Primary Software | Primary Software Developer |
|---|---|---|---|---|---|
| .SDC | Stardock Corporation | Spreadsheet Files | Stardock Central Download Archive | Stardock Central | Stardock Corporation |
| .SHT | The Document Foundation | Spreadsheet Files | HTML File With Server Side Includes | LibreOffice | The Document Foundation |
| .SILK | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Symbolic Link Format | Microsoft Excel | Microsoft Corporation |
| .SMX | MakeMusic, Inc. | Spreadsheet Files | SmartMusic XML File | SmartMusic | MakeMusic, Inc. |
| .SPW | Quantitative Software Management, Inc. | Spreadsheet Files | SLIM-Master Plan Workbook File | SLIM Suite | Quantitative Software Management, Inc. |
| .STC | Adobe Systems Incorporated | Spreadsheet Files | Contribute Connection Key File | Adobe Contribute 6.5 | Adobe Systems Incorporated |
| .SXC | Sun Microsystems | Spreadsheet Files | StarOffice Calc Spreadsheet | NeoOffice | Planamesa Software Inc. |
| .SXLS | Oracle Corporation | Spreadsheet Files | Sealed Excel Spreadsheet | Oracle IRM Desktop | Oracle Corporation |
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