How to Open an ER1 File

Written by tammy clevenger
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An ER1 file is an Entity Relationship Diagram data file for the AllFusion ERWIN Data Modeling application distributed by Computer Associates. AllFusion ERWIN is similar to Microsoft Visio but it has the functionality to not only graph and chart, but to model data extracted from databases and data warehouses. ERWIN is often used for modelling relationships in business diagramming and analysis. ERWIN is also used for designing and diagramming database relationships. An ER1 file is a saved relational diagram data file.

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Things you need

  • AllFusion ERWIN installed

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  1. 1

    Right-click on the ER1 file to show the Windows context menu.

  2. 2

    Click the "Open With" option from the context menu.

  3. 3

    Click the "AllFusion ERWIN" link to open the ER1 data file in ERWIN.

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