When using Open DataBase Connectivity (ODBC) with a 64-bit version of Windows, there are two versions of ODBC within Windows, 32-bit ODBC and 64-bit ODBC. If you have installed a 64-bit version of Genstat, the client menus can only work with the 64-bit ODBC control panel and drivers. If you concurrently also have a 32-bit version of Genstat installed, this will work with the 32-bit ODBC control panel and drivers.
If working with Microsoft Office, the default installation of the Office is 32-bit, and consequentially only the 32-bit ODBC drivers for Excel, Access, etc., will be available. It is not possible to have both 32-bit and 64-bit versions of Office concurrently installed. If you are using matching versions of Genstat and Office (i.e. both 32-bit versions or both 64-bit versions), then the connection should work as expected. However if you are using 64-bit Genstat with 32-bit Office or another 32-bit application with an 32-bit ODBC driver, this may require data source names to be configured through the 32-bit ODBC control panel.