C# .NET API to load, edit, save PDF & extract PDF metainfo. Edit XPS, AZW3, PST, MSG, EML, MBOX. Auto-detect file formats. Supports ABBR, HGROUP, HTML elements....C# .NET API to load, edit, save PDF & extract PDF metainfo. Edit XPS, AZW3, PST, MSG, EML, MBOX. Auto-detect file formats. Supports ABBR, HGROUP, HTML elements.