Try this:
Outside of Sonar, navigate in Windows Explorer to the folder containing the project templates.
Once there, click once up in the navigation bar to highlight the path and copy it.
Now, go into Sonar Preferences File Locations and paste this path into the place for project templates.
Now give it a shot. (All the above does is remove any small typo you might have had).
If the above does not work, try this:
Open Sonar again, and close the Quick Start dialog box.
Now, go to File>Open, and navigate to the folder where all your project templates are.
If you see your project templates here, then that means they were saved with the CWP extension, rather than the CWT extension.
Bob Bone