With CinEx HD Utility 1.6 you can also uninstall the database files out of the software.
CinEx HD Utility– Download and install the latest rendition of CinEx HD Utility
Step 1: Start CinEx HD Utility
Start CinEx HD Utility and select the movie you want to uninstall (1).
Step 2: Uninstall
Open the popup menu with clicking the right mouse button and click on “Uninstall” (2).