The file extension most commonly used for Excel workbooks is .xlsx. This is the default and standard format for Microsoft Excel workbooks created in Excel 2007 and later versions.
Understanding Excel File Extensions
The .xlsx extension denotes an Excel Workbook, which is an XML-based file format that does not support macros. It's the most common format for general data storage and analysis in Excel.
Microsoft provides a clear overview of supported file formats in Excel. The reference from Microsoft Support on Excel file formats lists several key extensions:
| Format | Extension |
|---|---|
| Excel Workbook | .xlsx |
| Excel Macro-Enabled Workbook | .xlsm |
| Excel Binary Workbook | .xlsb |
| Template | .xltx |
.xlsx(Excel Workbook): As the primary format,.xlsxfiles are open-standard, XML-based, and ideal for most spreadsheet tasks where macros are not required. They generally offer good compatibility and smaller file sizes compared to older binary formats..xlsm(Excel Macro-Enabled Workbook): If your Excel file includes Visual Basic for Applications (VBA) macros or XLM macro sheets, it must be saved with the.xlsmextension. This format ensures that any automation or custom code within the workbook is preserved and functional..xlsb(Excel Binary Workbook): This is a binary file format primarily used for very large Excel workbooks or when faster saving and loading times are critical. While it doesn't offer the same level of interoperability as XML-based formats, it can significantly improve performance for complex or massive datasets..xltx(Excel Template): For creating new workbooks based on a predefined structure, styles, and content, the.xltxextension is used for Excel templates. These files serve as blueprints for new.xlsxworkbooks.
Choosing the appropriate file extension is crucial depending on whether your workbook contains macros, its size, or its intended use as a template. For everyday use without macros, .xlsx remains the widely adopted standard.
