I found the path of PDR13_Action Theme on:
C:\Program Files\CyberLink\templates\PowerDirector Content Pack Essential\Styles\PDR13_Action_mp4
I can't change the background color in the theme designer because it's locked. So maybe there's an file where i can change the background image or the color code from black to any other color... But i can't find it! The theme is a bit boring in black...
Maybe you have any suggestions on where to find the file?
I need your help