In TIBCO Data Virtualization (TDV), typically the third-party adapter drivers are located under [TDV_Server_dir[\conf\adapters\system\[adapter_name]. However, for PostgreSQL 9.0 and 9.1 adapter there are no drivers place in this location, but the adapter does allow to connect to the PostgreSQL database:
This article provides details on the PostgreSQL driver that TDV adapters PostgreSQL 9.0 and 9.1 use to connect to the databases.