Indeed, the Telerik.Windows.Documents.Flow.FormatProviders.Docx.DocxFormatProvider class is used to import/export RadFlowDocument instances. The class is related to the functionality of the RadWordsProcessing library
and would not work with RadRichTextBox.
In order to create a RadDocument, you need to use the format provider located in the Telerik.Windows.Documents.FormatProviders.OpenXml.dll
in the Telerik.Windows.Documents.FormatProviders.OpenXml.Docx
namespace. Please note that a reference to the Telerik.Windows.Zip.dll is required as well to ensure the provider works properly.
I hope this helps.
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