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....Microsoft Excel 95/97 - 2003, SpreadsheetML, Opening Microsoft Excel...XLS, XLSX, XLSM, XLSB, SpreadsheetML, TabDelimited or TSV, CSV...