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| Extension | File Type Developer | File Category | File Type Description | Software | Software Developer |
|---|---|---|---|---|---|
| .ODS | Oracle Corporation | Spreadsheet Files | OpenDocument Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .OOS | Apache Software Foundation | Spreadsheet Files | Apache OpenOffice (OpenOffice.org) Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .SILK | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Symbolic Link Format | Apache OpenOffice Calc | Apache Software Foundation |
| .STM | Microsoft Corporation | Data Files | Exchange Streaming Media File | Apache OpenOffice Calc | Apache Software Foundation |
| .SXC | Sun Microsystems | Spreadsheet Files | StarOffice Calc Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .WK1 | IBM | Data Files | Lotus Worksheet | Apache OpenOffice Calc | Apache Software Foundation |
| .XLS | Microsoft Corporation | Spreadsheet Files | Microsoft Excel 97 To 2003 Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
| .XLSM | Microsoft Corporation | Spreadsheet Files | Microsoft Excel Open XML Macro-Enabled Spreadsheet | Apache OpenOffice Calc | Apache Software Foundation |
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