JDBC Driver for Progress Database

Hi experts,

We need to connect our SAP PI 7.0 which is running on Windows 2003 Server x64 bit Standard/Enterprise Edition SP1 to a progress database 9.1D version on Unix. The problems are

1. What JDBC driver should I use?

2. We tried to copy progress JDBC driver jar files from the progress database installation directory into my windows machine and tried to run it, it fails to run. It gives the following error

Error during database connection to the database URL 'jdbc:JdbcProgress:T:' using the JDBC driver 'com.progress.sql.jdbc.JdbcProgressDriver': 'com.sap.aii.adapter.jdbc.sql.DriverManagerException: Unable to locate a suitable JDBC driver to establish a connection to URL 'jdbc:JdbcProgress:T:''

3. Does anyone know what connection architecture should I use to run under such environment?