From the Blog posting by Sergey Abakumoff...

General

This is the first in a series of posts that will highlight small and simple but useful undocumented features of Data Dynamics Reports and ActiveReports. I have several topics in mind and hope that more ideas about such features come soon. I will start with the answer to question we were recently asked - is that possible to export the report to CSV format using Data Dynamics Reports?


Tip: use Xml Rendering Extension to get CSV output.
That sounds weird, but it's really not. Let me explain. Data Dynamics Reports allows you to save the data that are shown by a report to XML format. The output XML content does not include the information about report items style, pagination, interactivity, etc., it only includes the data that are grouped, sorted, filtered and displayed in the report's data regions.

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Sergey Abakumoff.