How to Open an XLS File in Excel. 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 ...

Sending Excel files containing crucial financial and business data has risks. To add a layer of protection, you should learn to password protect an Excel file.

How to Open XLS Files in Mac OS X. Businesses that switch to Mac computers may encounter problems when attempting to open some file types, such as Excel Spreadsheet (XLS) files. Macs do not have a ...

Numbers has the ability to open Excel files so you can work on them. You can also export spreadsheets in Numbers so that they are compatible with Excel.

With the file open in Pages, Numbers, or Keynote, select File and then Set Password to choose and apply your password.