Opening password protected excel files

aruna105 wrote:

I've created a few excel files which I am unable to open on my Mac. I have tried the changing the .xls ending to .zip - but it says that it is unable to expand as it is in an unsupported format

please help - I will have lost so much work if I cannot open these

Excel is a Microsoft product, explain to their support what happens when you try to open it.

You can also do a search of your issue on Microsoft support page.

You'll get better troubleshooting tips from there.