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....xls" ) puts "Sheet added successfully...sysopen ( @data_dir + 'book1.xls' , "w" ) # Instantiating a Workbook...