Hi Subileau Pascal,
Telerik.Windows.Documents assembly is available for Silverlight 4 only
. Please make sure you've downloaded and istalled RadControls For Silverlight 4. The all Telerik assemblies, including Telerik.Windows.Documents should be located in Binaries\Silverlight folder in the installation or in the downloaded zip, e.g.:
C:\Program Files (x86)\Telerik\RadControls for Silverlight Q1 2010 SP1\Binaries\Silverlight
Let me know if this helped.
the Telerik team
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