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....samples: auto msg = MapiMessage -> Load ( fileName ); msg -> get_Attachments...( u "New display name 1" ); msg -> get_Attachments [ 1 ] -> set_DisplayName...