To repair corrupted Excel Files, try Open and Repair function of MS Excel first. It is built-in repair function that helps me fix my corrupt .xlsx files and open them. As it is a built-in feature, it has a drawback. It might not work in severe corruption issues. In such situation, we can try a third-party Excel Recovery Tool software which to recover data from corrupt XLSX files that helps helps you repair corrupt .xlsx files and recovers your maximum possible data from them.Download its free trail demo version, visit: http://www.softmagnat.com/excel-recovery.html