| 1 | AWS | Ability Plus Software | Ability Spreadsheet Format |
| 2 | CSVX | N/A | XML CSV |
| 3 | CWK | Apple | ClarisWorks Document |
| 4 | DIF | Microsoft | Data Interchange Format |
| 5 | ECSV | N/A | Encapsulated Comma Separated Value |
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| 6 | FODS | Oracle | OpenDocument Flat XML Spreadsheet |
| 7 | IIF | Intuit | Intuit Interchange Format |
| 8 | NMBTEMPLATE | Apple | Numbers Spreadsheet Template |
| 9 | NUMBERS | Apple | Numbers Spreadsheet Format |
| 10 | ODS | Oracle | OpenDocument Spreadsheet |
| 11 | OTS | OASIS | OpenDocument Spreadsheet Template |
| 12 | PMV | SoftMaker Software | PlanMaker Spreadsheet Template |
| 13 | PXL | Microsoft | Pocket Excel Format |
| 14 | QPW | Corel | Quattro Pro Spreadsheet |
| 15 | SDC | Oracle | Apache OpenOffice Calc Spreadsheet |
| 16 | SILK | Microsoft Corporation | Microsoft Excel Symbolic Link Format |
| 17 | SLK | Microsoft | Symbolic Link Format |
| 18 | SLS3 | Microsoft Corporation | Microsoft Excel 3 For Mac Template |
| 19 | SLS4 | Microsoft Corporation | Microsoft Excel 4 For Mac Template |
| 20 | SLS5 | Microsoft Corporation | Microsoft Excel 5 For Mac Template |
| 21 | SLS8 | Microsoft Corporation | Microsoft Excel 98 For Mac Template |
| 22 | STC | Adobe Systems | OpenOffice.org Calc Spreadsheet Template Format |
| 23 | SXC | Sun Microsystems | StarOffice Calc Spreadsheet |
| 24 | SYK | Microsoft Corporation | Microsoft Excel Symbolic Link Format |
| 25 | SYLK | Microsoft | Microsoft Symbolic Link Format |
| 26 | TDL | N/A | Tab Delineated Format |
| 27 | TSV | N/A | Tab Separated Values Format |
| 28 | UOS | N/A | Uniform Office Spreadsheet |
| 29 | WB0 | Corel Corporation | Corel Quattro Pro Spreadsheet |
| 30 | WB1 | AG Interactive | Webshots Picture Format |
| 31 | WB2 | Corel | Corel Quattro Pro Format |
| 32 | WB3 | Corel | Corel Quattro Pro 7 And 8 Format |
| 33 | WB? | N/A | Corel Quattro Pro spreadsheet file |
| 34 | WK! | IBM | Lotus 1-2-3 Spreadsheet |
| 35 | WK1 | IBM | Lotus Worksheet |
| 36 | WK2 | IBM | Lotus 2 Worksheet |
| 37 | WK3 | IBM | Lotus 3 Worksheet |
| 38 | WK4 | IBM | Lotus 4 Worksheet |
| 39 | WK5 | IBM | Lotus 5 Worksheet |
| 40 | WKE | IBM | Lotus 1-2-3 Educational Version Worksheet |
| 41 | WKI | IBM | Lotus 2 Worksheet |
| 42 | WKQ | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| 43 | WKS | Microsoft | Works Spreadsheet |
| 44 | WKU | IBM | Lotus 1-2-3 Spreadsheet |
| 45 | WQ! | Corel Corporation | Corel Quattro Pro Compressed Spreadsheet |
| 46 | WQ0 | Corel Corporation | Corel Quattro Pro For MS-DOS Spreadsheet |
| 47 | WQ1 | Corel | Quattro Pro For DOS Spreadsheet Format |
| 48 | WQ2 | Corel | Quattro Pro For DOS Spreadsheet Format |
| 49 | WR1 | IBM | Lotus Symphony Spreadsheet |
| 50 | XCEL | Microsoft Corporation | Microsoft Excel For Mac Spreadsheet |
| 51 | XL | Microsoft | Excel Spreadsheet |
| 52 | XLS | Microsoft | Excel Spreadsheet |
| 53 | XLS3 | Microsoft Corporation | Microsoft Excel 3 For Mac Spreadsheet |
| 54 | XLS4 | Microsoft Corporation | Microsoft Excel 4 For Mac Spreadsheet |
| 55 | XLS5 | Microsoft Corporation | Microsoft Excel 5 For Mac Spreadsheet |
| 56 | XLS8 | Microsoft Corporation | Microsoft Excel 98 For Mac Spreadsheet |
| 57 | XLSB | Microsoft | Excel Binary Spreadsheet |
| 58 | XLSM | Microsoft | Excel Open XML Macro-Enabled Spreadsheet |
| 59 | XLSMHTML | Microsoft | Microsoft Excel MIME HTML Spreadsheet |
| 60 | XLSX | Microsoft | Microsoft Excel Open XML Spreadsheet |
| 61 | XLS_ | Microsoft Corporation | Microsoft Excel For Mac Spreadsheet |
| 62 | XLT | Microsoft | Excel Template |
| 63 | XLTM | Microsoft | Excel Open XML Macro-Enabled Spreadsheet Template |
| 64 | XLTX | Microsoft | Excel Open XML Spreadsheet Template |
| 65 | XLW4 | Microsoft Corporation | Microsoft Excel 4 For Mac Workbook |
| 66 | XLW5 | Microsoft Corporation | Microsoft Excel 5 For Mac Workbook |
| 67 | XLW_ | Microsoft Corporation | Microsoft Excel 2 For Mac Workbook |
| 68 | XLXML | Microsoft Corporation | Microsoft Excel XML Worksheet |
| 69 | XMAP | XMind | XMind 2007/2008 Workbook |
| 70 | XMLX | Microsoft Corporation | Excel Spreadsheet |
| 71 | XSLB | N/A | Microsoft Excel data |
| 72 | _XLS | Microsoft Corporation | Microsoft Excel Workbook |