1. How to Save a File as .xlsm To save your file as .xlsm, go to "File" > "Save As" and select "Excel Macro-Enabled Workbook" from the file type dropdown menu. 2. Advantages of the .xlsm Format The .xlsm format allows you to save macros and VBA code, which is essential for complex spreadsheets. 3. Security Risks It is important to note that .xlsm files can contain malicious macros, so it is important to take precautions when opening files from unknown sources.