You may want to check out the WID Scanner tool that is available for download here:
It examines the physical .wid file and parses out objects used in each report.
Otherwise, you can code something using the Report Engine SDK to pull this information, or trial a 3rd party product for this - System Profiler has canned reports that display objects used in reports…
crystal01 
(BOB member since 2006-08-30)