.xlsm
Excel workbook with macros
An Excel workbook that also carries VBA macros, small programs that automate work inside the file. Apart from the macro code, its XML layout matches a normal workbook.
Workbooks that rely on recorded or written macros, such as automated reports and data-entry forms.
Opens in Excel; LibreOffice Calc and Google Sheets (macros may not run)
About XLSM files