If you need a computer on your network to automatically perform a file copy as soon as Windows loads -- such as to back up a particular file to your company's server -- the simplest method is to ...
XLS files are Excel workbook files created in Excel 97 or Excel 2003. The 2007, 2010 and 2013 versions of the program use the XLSX format by default to save workbooks, but can also use the XLS format.