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MsRichTextBoxXamlFormatProvider is capable of importing/exporting XAML content from/to system's RichTextBox. However, the two models are not completely compatible that’s why you experienced some formatting loss during the conversion.
RadRichTextBox not only gives you the ability to display rich text content, but also helps you to export the same to different file formats and you can save it to file or database. This is done by different format providers which are in different assemblies. Please take a look at this article
for more information.
Please, do not hesitate to ask any questions!
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