Convert Old rpt files to never version

Currently we have VB6 viewer to view crystal reports in our product.But recently we decided to go for a Java Viewer.It works fine for new reports.But our customers have lots of report that are design from older version of designer(Version earlier than 9). For that reports it gives a error as follows,

>  com.crystaldecisions.sdk.occa.report.lib.ReportSDKClientDocException: Reports older than version 9 are not supported.---- Error code:-

Do we have a way to convert those older reports programmatically (java Code) to newer version.Since we have thousands of reports it will help to us.

Thanks.