Let me give you more details. To export to XLSX you need to add new references to the Silverlight project:
- Telerik.Reporting.OpenXmlRendering.dll and DocumentFormat.OpenXml.dll versions 2.0.5022.0 and 2.5.5631.0
- Telerik.Reporting.OpenXmlRendering.2.7.2.dll and DocumentFormat.OpenXml.dll version 184.108.40.206 and later.
The DLLs can be fount at the installation folder of Telerik Reporting: C:\Program Files (x86)\Telerik\Reporting <Version>\Bin. Note that you don't need to add any dependencies sections.
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