| .wki |
Lotus 2 Worksheet |
| .wku |
Lotus 1-2-3 Spreadsheet |
| .wq1 |
Quattro Pro for DOS Spreadsheet File |
| .wq2 |
Quattro Pro for DOS Spreadsheet File |
| .wkq |
Quattro Pro for DOS Spreadsheet File |
| .xls |
Excel Spreadsheet |
| .xlsx |
Microsoft Excel Open XML Spreadsheet File |
| .xlr |
Works Spreadsheet |
| .xar |
Xara Xtreme Drawing |
| .xltx |
Excel Open XML Spreadsheet Template |
| .xltm |
Excel Open XML Macro-Enabled Spreadsheet Template |
| .xlsb |
Microsoft Excel Binary Workbook File |
| .xl |
Excel Spreadsheet |
| .xlshtml |
Microsoft Excel HTML Spreadsheet |
| .xlsmhtml |
Microsoft Excel MIME HTML Spreadsheet |
| .xlthtml |
Microsoft Excel HTML Spreadsheet Template |
| .xlc3 |
Microsoft Excel binary workbook file |
| .jnb |
SigmaPlot workbook |
| .excel |
Microsoft Excel spreadsheet |
| .xmlx |
Excel spreadsheet |
| .wk! |
Lotus 1-2-3 spreadsheet |
| .xls_ |
Microsoft Excel for Mac spreadsheet |
| .silk |
Microsoft Excel Symbolic Link format |
| .ksp |
Calligra Sheets spreadsheet |