As long as you can obtain a stream with the content of the file in a specific format, you can load it in the rich text box in the following way:
IDocumentFormatProvider formatProvider = DocumentFormatProvidersManager.GetProviderByExtension(
.editor.Document = formatProvider.Import(stream);
You can find more information on the format providers in this article
Please refer to this forum thread
for a demo project showing how a file can be loaded from the server using WebClient.
the Telerik team
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