Before using the Windows Registry as a directory service, review your SAP ASE products.
SAP ASE only – you can deploy an application on multiple clients and enter the network information once in the Registry on the SAP ASE computer without creating and maintaining a sql.ini file on every client.
SAP ASE and its bundled applications – the client applications that are bundled with SAP ASE require a sql.ini file. Even if you are using the Registry for your own applications, you must maintain a sql.ini file if users are to connect from any of the SAP ASE client applications, such as SAP Central.