Hi Dirk,
If you are looking for search functionality, logon to Infoview and refer following snapshot to find any document.
If you want to list all the Crystal reports in your environment then logon to Query builder http://servername:8080/AdminTools and run following query.
select si_name from ci_infoobjects where si_kind = 'crystalreports'
Hope this helps.
Regards,
Sohel