Based on a [url="http://mails.datawatch.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=1;t=001044#000000"]previous discussion here[/url], it looks like you won't be able to import Crystal's .rpt files directly into Monarch.
The file extenstion is quite misleading, as the file is not a readable report, but rather a set of instructions interpreted by Crystal.
Only by exporting a readable document from Crystal Reports will you be able to use Monarch in conjunction with Crystal Reports.
I've not used Crystal, so I cannot guide you further on this process. Perhaps someone else in the group can do this.