Can you call external code from XE?

Hi,
I have an application that uses external code, called via extproc. During a standard Oracle installation, I need to modify the listener configuration to allow it to do so. This is done by modifying listener.ora like follows:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\ora10_2)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ANY")
without the 'ENVS' entry, the listener security prohibits the loading of our code.
The touble I have on XE is that attempting to restart the listener after this change gives an error:
TNS-01155: Incorrectly specified SID_LIST_LISTENER parameter in LISTENER.ORA
NL-00303: syntax error in NV string
Does this mean that external code cannot be used? or does anyone know a workaround?
Thanks in advance,
Jim

One obvious problem is the missing close paren, seen when you reformat as follows:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\ora10_2)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ANY")
) <--- this is missing

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