Remove a rendering extension
To remove a Reporting Services rendering extension, remove the Extension element for your rendering extension from the rsreportserver.config file, located in the %ProgramFiles%\Microsoft SQL Server\MSRS10_50.\<Instance Name>\Reporting Services\ReportServer folder. If you made entries for a Report Designer and a report server, remove the Extension element from the RSReportDesigner configuration file as well. After the configuration information is removed, the rendering extension is no longer available to the component.