The encoding used when opening textbased files or email messages such as CSVgroupdocs.viewer/filetype/csv TXTgroupdocs.viewer/filetype/txt and MSGgroupdocs.viewer/filetype/msg. Default value is UTF8....and image files Render text documents as HTML, PDF, and image files...namespace GroupDocs.Viewer.Options assembly GroupDocs.Viewer DetectEncoding...