At this point there are no immediate plans to implement a ASP.NET AJAX or Kendo UI solution which will be capable of importing XAML files exported from RadRichTextBox.
In terms of showing your documents, you could try exporting them to HTML with HtmlFormatProvider. However, this solution would strip the custom annotations you are using, so I am not sure how it fits your needs.
Let us know if you have additional comments or questions.
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