Android Cloud SDK & REST APIs to build apps for rendering & viewing images, HTML, PDF, Word, Excel, Email, Visio, Project & CAD file formats....DOC, DOCX, DOCM, DOT, DOTX, DOTM Excel: XLS, XLSX, XLSM, XLSB...SXC CGM SML EML NSF VIM DXF DOTM PPT RTF H VTX NUMBERS PDF XLS...