Access report via HTTP?

When using com.crystaldecisions.reports.sdk.ReportClientDocument.open(Object, int) (i.e. when using thick client setup), is it possible to refer to a remote file (located either on a HTTP server or directly on a remote machine) or must the *.rpt be located on the local machine where the report is constructed?

When I try anything other than a local file path, I get a file not found error.