.ES files are script files used exclusively by SageCRM. SageCRM is a Customer Relationship Management (CRM) solution used for managing business processes. .ES files may contain JavaScript-based code as well as eWare API calls. .ES files are used to script or install UI customization changes in am installation of the SageCRM application. ES files will typically be named "COMPONENT.ES" and must be saved within the "CRM\inf" directory of the SageCRM installation. An .ES file must be saved with its corresponding .ECF files.