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How to open .ER1 file extension?

File Type : Unknown Apple II File (found on Golden Orchard Apple II CD Rom)
Compatible with (WinXP,Vista,Win7,Win8 and Win10)

Looking for a program to open .ER1 files?

"Windows unable to open a file!" is probably the most common error faced by millions every day. This is either because the program required to open a file is not available on your system or there may be other issues.

We recommend that you run a free scan to check for missing drivers.



What is .ER1 file extension?

.ER1 file extension is a known file type. This section of tells you everything you need to know about this extension.
Entity relationship diagram created by ERWin, a data modeling program published by Computer Associates (CA); used for visualizing data structures and managing data complexities. CA ERWin Data Modeler was previous known as AllFusion ERwin Data Modeler.
You can see a list of software programs here on that can open this file type so that you don’t need to search for it on the web. You can then open your file with this extension using a software listed below.

Software that can be used to open .ER1 files:

Microsoft Windows:
  • CA ERWin Data Modeler