Open pdf with preview default

How open pdf with preview default I preview PDF files of Adobe and other Images? PDF preview is possible when Adobe Acrobat Reader 7.

As proof a nice preview picture! Q-Dir uses extensions of the system d! FAQ Windows 8 and 8. Where is the difference between favorites and Quick links?

The column settings are not saved. How do i transfer the settings of columns in Q-Dir? You might not have enough rights! How can i transfer the folder from View-1 to View-2? How can i manage or delete the favorites? Problems with Vista and favorites or desktop shortcuts!