An Excel Workbook 2007 or 2010 business file enhanced with macros will have the XLSM file extension. If you have Excel 2007 or 2010, double-click the filename to open the file.

How to Convert Read-Only for Excel 2007 to Excel 2003 to Make Changes. When Microsoft rolled out Office 2007, the company made some fundamental changes to its file formats, updating them from ...