.ER1 File Extension

Verified information
Information about the file ER1
  • ERWin Entity Relationship Diagram
  • Data Files
  • Computer Associates

What is the ER1 file?

The ER1 file extension can be associated with several types of files. Most often, however, a file with such an extension is associated with the ERWin Entity Relationship Diagram format. ER1 files are supported by Windows operating systems. The ER1 file is one of the Data Files files, just like 1326 of the other files found in our file information database. The creator of ERWin Entity Relationship Diagram is Computer Associates.

A program that can open the ER1 file is e.g. CA ERWin Data Modeler. This software was released by CA Technologies.

Programs, that can open .ER1 files

CA Technologies
CA ERWin Data Modeler

How to open a .ER1 file?

If you have problems opening the file ER1, then in most cases the problem is only the lack of the proper application installed. Select one of the programs from the list and install it on your device. The operating system should automatically associate the ER1 file format with the installed program. If not, right click on your ER1 file and select from the menu "Open with" . Then select the installed program and confirm the operation. Now all ER1 files should automatically open with the selected program.

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