Hi, I’m unable to open a specific excel file. I can open other files, but not one specific file. The error message states that the file format or file extension is not valid, and that I should verify that the file has not been corrupted and that the file extension matches the format of the file.
MacBook Air 13″
I keep a current copy of LibreOffice Suite on my Mac for those rare occasions when a Microsoft document gets bent and cannot be opened by Microsoft Excel or Apple's Numbers. I find if I open it in LibreOffice and immediately save it as the corresponding .xlsx spreadsheet, that the previous applications will open it correctly.
Back in ancient times, I was using the Applix Office suite on my Sun Solaris workstation and it couldn't open a customer Word document. I installed StarOffice (LibreOffice's grandparent) and opened and saved the Word document so it could be opened properly in the Applix software.
Are you using MS Office? Try to open the file in Numbers our LibreOffice.
Thank you for responding. That worked. I had to open in Numbers and could obtain an earlier version I could access. Many thanks for your help.
Can’t open excel file that I could open previously
