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....$customProp3 , "Source" , array ()); //Save the file with added properties...$ptr -> Call ( $workbook , "Save" , array ( $dataDir . "/Test_Workbook...