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.

Fix Cannot open the Clipboard in Excel. ... Try a third-party tool to repair the Excel file. 1] Run Excel in Safe mode and disable add-ins.

This month's monster security patch for Office breaks Excel when it tries to open HTML files, and it seems unlikely Microsoft will fix the problem Excel users are reporting an odd bug in the way ...

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 ...