For WP 9 the file that you need is C:\windows\application data\corel\perfect expert\9\custom WP templates\wp9us.wpt. I believe that WP8US.wpt is the file in version 8. Once the file is restored, you will still need to go to tools, settings, customize and put a check in the appropriate toolbar. It may be a modified version of the WP8 toolbar or else one with a custom name.
Hope this helps, Don