installable ISAM

I need to link to another MDB table from an Access MDB.

This has to be done at runtime, so I think I have to
use 'Connect', but there is an error:

Runtime error 3170
Couldn't find installable ISAM

Code:
Set dbs = CurrentDb
strTable = "JetTable"
strConnect = "MDBpath"
strSourceTable = "tblTable"
Set tdfLinked = dbs.CreateTableDef(strTable)
tdfLinked.Connect = strConnect
tdfLinked.SourceTableName = strSourceTable
dbs.TableDefs.Append tdfLinked

It works when linking from the database window
so surely the above should be OK??

Any ideas

Cheers