We have an ODBC driver from LIANT SOFTWARE CORPORATION, but it's the old Windows 98 version. Works under NT but not tested with Win2000. Newer versions are very expensive for what we're doing (over £1000, $1500) and the COBOL application is due to be phased out 3 months ago.
There is also a related DBA program which sets up the control files necessary to link the virtual table and field names to the Cobol data files.
Their new product is called Relativity ...
http://www.liant.com/products/relativity/