Hi dear,
If you are looking for an easy solution to Crack the protection of Microsoft Excel Worksheet you are in the right place. Here I (Ripon Sarkar) discussed the very easy way to do your desired task. I am considering you use around excel 2016 of Microsoft Office Program where the openxml open-source specification is available.
As the method is also backward compatible, so you can use this method even in the older version of excel. Simply save-as from a .xls version to a .xlsx the version before you try it.