It says 'the file might have been damaged or modified from its original format'. 'Hello, I have an excel file that cannot be opened for some reason. Is there any suggestions? Thank you for your advice.' I not only lost data but also lose the time I invested in making the whole report. 'I was working on my Excel file for last 15 days but today after making so many recent changes, I accidentally clicked NOT to save it. 'I was using Excel, I hit the save button and Excel crashed, and now I can't find my file, is there any way to recover my file.