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XLSM is a spreadsheet file format used by Microsoft Excel that supports macros and advanced features. It is similar to XLSX but includes the ability to automate tasks and perform complex calculations through embedded macros. XLSM files are commonly used in business and financial analysis.
XLS is a file format used by Microsoft Excel for storing spreadsheet data. It supports a wide range of functions, including calculations, graphs, and formulas. XLS files are commonly used in business, finance, and data analysis. However, it has been replaced by XLSX in newer versions of Excel for better compatibility and file size.