Files that contain the .xlsm file extension are files that contain macro-enabled spreadsheet files that have been created with the Microsoft Excel spreadsheet application.
XLSM worksheets contain cells that are arranged in columns and rows. The spreadsheets with the .xlsm file extension also use embedded macros that have been programmed into the worksheet contained in the file.
The XLSM file format can only be used with the 2007 and later versions of Microsoft Excel. These versions of Excel use the Open XML format, which allows the creation of the XLSM files. Previous versions of Excel were unable to create XLSM macro-enabled worksheets.
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