Add Large Object support to database programmatically

I have been working to create a VB6 program to automatically create a
PostgreSQL database, tables and triggers for an application I am updating. I
have everything working great, except one of my tables needs to store a
bitmap image. I am using the Large Object (lo) contrib module to do this.
Using pgAdmin III, I can run the Query Tool and load the lo.sql file from
the \share\contrib folder and execute it on my database and it succeeds.

What I need to be able to do is load this contrib module on the fly from VB6
after creating my database. Using the content of the lo.sql file, I created
the following code:

Private Function AddLargeObjectDataType(connConnection As ADODB.Connection)
As Boolean
Dim cmdCommand As New ADODB.Command

With cmdCommand
.ActiveConnection = conConnection
.CommandType = adCmdText
.CommandText = "SET search_path = public; CREATE DOMAIN lo AS
pg_catalog.oid;" _
& "CREATE FUNCTION lo_oid(lo) RETURNS pg_catalog.oid
AS" _
& "'SELECT $1::pg_catalog.oid' LANGUAGE SQL STRICT
IMMUTABLE;" _
& "CREATE FUNCTION lo_manage() RETURNS
pg_catalog.trigger" _
& "AS '$libdir/lo' LANGUAGE C;"
Call .Execute
End With
Set cmdCommand = Nothing
End Function

However, when I execute this code, I get a SQL "syntax error at or near
'$libdir/lo'" and the contrib module is not loaded. So I tried using a hard
coded path 'C:\Program Files\PostgreSQL\8.1\lib\lo' instead of '$libdir/lo'
and it also fails. I tried using double backslashes, same result. Forward
slashes, same result.

Any ideas?
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