A not so messy solution is to open the report in Impromptu and select Insert from the menu and choose more Objects, then select catalog file name from the dialog. Place this in the report header or footer and leave it dynamically sized. This puts the catalog file name with path into the report. You can also do this with the report file name, which can be a godsend when a user comes to you and says "I need THIS report", but doesn't know what the report file name is.
Regards,
Dave Griffin