The first thing you should do here is to close all programs that are using the Excel file you are attempting to open. Please ensure the .xls file is not opened in other workbooks, add-ins, or apps.

Right-click the Excel file that you cannot open and select Properties. When the Properties dialog shows up, switch to the Security tab. Hit the Edit button to change permissions.

Resolve the "Cannot Be Opened Because the Developer Cannot Be Verified" issue on Mac effortlessly with expert tips and tricks. Get your system running smoothly again.

Microsoft on Thursday released a pair of updates to fix a problem with Open XL documents: Microsoft Office 2008 for Mac 12.2.1 Update and Microsoft Office Open XML File Format Converter 1.1.1 ...

If you use Microsoft Excel on your Mac, you can save the spreadsheets you create and open them in Numbers, Apple’s spreadsheet app. It’s a handy feature to use in case you can’t access ...

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 ...