C# .NET Document Comparison API. Compare & merge PDF Word DOC DOCX, Excel Spreadsheet, PPT, PPTX, HTML, EMLX MSG, VSDX, DXF DWG & image file formats...., DOT , DOTX , DOTM , RTF , TXT Excel: XLS , XLSX , XLSM , XLSB..., MOBI AutoCAD : DXF , DWG Email : EML , EMLX , MSG Images :...