RadRichTextBox provides several export formats out of the box - XAML, DOCX, HTML, RTF, PDF and Plain text. The functionality utilizes by the respective for each format format provider
. In order to export to a custom format you would need to create a custom format provider as well. For this purpose you'd have to implement the IDocumentFormatProvider interface. Please note that creating a custom format provider is not a trivial task.
I hope this helps!
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