Net Document Annotation API. View, tag, comment & annotate PDF Word DOCX, Excel XLSX, PPTX, EML EMLX, VSS VSD, OTP, Cad & image file formats....Outlook emails, images, metafiles, CAD drawing and various other formats...DICOM AutoCAD : DWG , DXF , CAD Other : HTM , HTML , CSV , DJVU...