Removing a Rendering Extension
To remove a Reporting Services rendering extension, simply remove the Extension element for your rendering extension from the ReportServer.config file, located in C:\Program Files\Microsoft SQL Server\MSRS10.<Instance Name>\Reporting Services\ReportServer\Bin folder. If you made entries for a Report Designer as well as 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.