Notes about the ER1 file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The ER1 file type is primarily associated with 'AllFusion ERwin' by Computer Associates International, Inc.. AllFusion ERwin Data Modeler is a data modeling solution that can help you create and maintain databases, data warehouses and enterprise data models.