When you want to customize the default template that Excel uses for new workbooks, you use the template in your XLSTART folder on your hard drive. This is the template that Excel automatically opens whenever you launch the application. Here's another good tip: You can also use the XLSTART folder to automatically open any workbook(s) you want when Excel starts. In fact, there are two folders that Excel checks for workbooks when you start the program. If any files are found in these folders, Excel opens them.