I have worked for two weeks on a file, and all went perfect, until today.
My system Mac OS 10.11.6 Excel 14.7.5
I've never had such issue before. I have created a huge file, and worked on it for two weeks, as I am learning excel. I did add a few interesting features there, and it all worked nicely. But today, after a whole day of working on it, I have saved it and closed it, and then tried to reopen and got a message that "Excel couldn't open the file because some content is unreadable. Do you want to open and repair?". After hitting Open and repair, I get the message that This workbook cannot be opened and repaired because it is corrupt. I am shocked to say the least. So much work done.
I don't understand what's happening. The only thing that gives me a little hope is that when I look in my directory, and put a mouse on a file, I see that it does display some content, sort of a picture. See screenshots. So I do hope the data and all formulas, formatting, etc is not lost. I save the file in both formats .xlsx and .xlsm (I have macros only on one sheet).
I will be grateful for your help!