How to repair excel file in here, I have totally no idea

Hi guys!
I had no idea why my excel file need a repair and my mac doesn’t save it in excel file, instead, it led me to this app, which I have never use this app before.

Please help me how to repair my excel file in here. Its a work file, so I hope anyone can help me ASAP please.

Thank you so much

I do not have a Mac but I would try Mac tools first