A universal document viewer in ASP.NET Core MVC for 140+ file formats. For the document rendering at the backend, the application uses GroupDocs.Viewer for .NET API – a powerful file viewer API which supports over 140 document types including PDF, Word, Excel, PowerPoint, Visio, CAD, Outlook, and many other popular formats. Complete step-by-stpe guide: Created Document Viewer in ASP.NET Core MVC