Class Libraries & REST APIs for the developers to manipulate & process Files from Word, Excel, PowerPoint, Visio, PDF, CAD & several other categories in Web, Desktop or Mobile apps. Develop & deploy on Windows, Linux, MacOS & Android platforms.... string myPath = @"d:\test\My_Book1.xls" ; //Open the excel...ActiveWorkbook . SaveCopyAs ( @"d:\test\out_My_Book1.xls" ); //Quit...