Does extproc for Oracle 64-bit 11.1.0.7 on Win 2003 64-bit load 32 bit DLL?

Question

Hello
Background:
We had Oracle 11.1.0.7.0 32-bit EE on Windows 2003 32-bit EE and now migrated to 64-bit (both OS and DB) and everything worked brilliantly ok except...
Problem:
We used to be able to connect to an external application (Postcode Plus from AFD) via extproc to search postcodes / addresses etc. However, after the migration getting the error:
ORA-06520: PL/SQL: Error loading external library
ORA-06522: Unable to load DLL
The listener.ora and tnsnames.ora configuration as exactly same as what we had on 32-bit machine (except the host name).
For convenience, I've attached both here:
listener.ora (on 32-bit machine):
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\Oracle\product\11.1.0\db_1)
(PROGRAM = extproc)
(ENVS="EXTPROC_DLLS=C:\Oracle\product\11.1.0\db_1\LIB\pcpOracle.dll:C:\Oracle\product\11.1.0\db_1\LIB\afdutl32.dll")
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\Oracle\product\11.1.0\db_1)
(PROGRAM = extproc)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.30.241)(PORT = 1521))
tnsnames.ora (on 32-bit machine):
MYDB32 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.30.241)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = MYDB32)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
listener.ora (on 64-bit machine):
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.30.247)(PORT = 1521))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\Oracle\product\11.1.0\db_1)
(PROGRAM = extproc)
(ENVS="EXTPROC_DLLS=C:\Oracle\product\11.1.0\db_1\LIB\pcpOracle.dll:C:\Oracle\product\11.1.0\db_1\LIB\afdutl32.dll")
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\Oracle\product\11.1.0\db_1)
(PROGRAM = extproc)
tnsnames.ora (on 64-bit machine):
MYDB64 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.30.247)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = MYDB64)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
Questions:
1. Does extproc for Oracle 64-bit 11.1.0.7 on Win 2003 64-bit load 32 bit DLL?
2. When searched got a quite of lot link about extproc32 (for all versions of UNIX), but not for Windows and found this link Extproc32 installation Does that mean it is not possible to load 32-bit DLL on 64-bit Windows installation?
3. Is there any workarounds? Or am I stumped so I should now go back and reinstate the 32-bit installation?
Any input / recommendation is appreciated!!
Regards
Kannan

Answer 1

Does that mean it is not possible to load 32-bit DLL on 64-bit Windows installation?Yes,it's not possible,refer to MOS/metalink:
Is It Possible To Call 32Bit Libraries Using External Procedure Agent Extproc On Windows 64Bit ? [ID 372512.1]
Werner