You can make Excel always open old spreadsheets in Protected View. Enable or disable Protected View using in-built setting, Group Policy, Registry.

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 ...

Learn how to open & view exported .TSV files on Windows PC using Excel. You can also use free TSV file viewer software or online tools.

If you want Excel to prompt for a password to open the file, enter a password in the "Password to open:" field.

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.

Microsoft Excel has several features designed to help you recover unsaved versions of files and prevent data loss.

Read next: How to open a .docx Word file on Mac, iPad & iPhone How to edit .xlsx files on Mac So, how do you edit an .xlsx file on a Mac? Due to the open file format used by Microsoft’s Excel ...