http://bugs.winehq.org/show_bug.cgi?id=58140
--- Comment #1 from Hans Leidekker hans@meelstraat.net --- What does your /etc/odbcinst.ini look like? That's where the ODBCINST.INI key is created from and it should list installed drivers with their files. Mine has these entries:
[PostgreSQL ANSI] Description=PostgreSQL ODBC driver (ANSI version) Driver=psqlodbca.so Setup=libodbcpsqlS.so Debug=0 CommLog=1 UsageCount=1
[PostgreSQL Unicode] Description=PostgreSQL ODBC driver (Unicode version) Driver=psqlodbcw.so Setup=libodbcpsqlS.so Debug=0 CommLog=1 UsageCount=1