You can use the Job Browser open all preview files for a job, can be fronts and backs of multiple impositions

1. Choose Job Browser from the File menu or select the toolbar icon 
2. Launch the Job Browser dialog box using either the File/Job Browser menu item or the Job Browser icon  in the toolbar 
   • In the Open dialog select a folder containing a set of job separations (can be fronts and backs of multiple impositions) and press the Select button.  
   • The Job Browser dialog opens and allows you to preview the number of signatures, imposition style and colors contained in the separations
   • Click Open to open all the imposition separations, or expand the top level folder to show all the available signatures, check the checkbox of each signature you wish to view, and then click Open
3. This dialog box displays the contents of the last folder selected. Press Rescan scan to select another folder for viewing.