File Extension Library


.ER1 File Extension

  • Developer by: Computer Associates
  • Category: Data Files

What is an .ER1 file?

.ER1 file extension is created by Computer Associates. .ER1 has been classified as Data Files.

.ER1 is ERWin Entity Relationship Diagram

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.

How to Open .ER1 file on different platforms

Open .ER1 File on Windows

  • Right-click a .ER1
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .ER1 file and Select check box "Always use this app to open .ER1 files" Press "Ok"

Open .ER1 File on Mac

  • Right-click (or Ctrl + Left-click) the .ER1 file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .ER1 File on Linux

Right click on the .ER1 file, choose "Open with" and select a program from the list above

Open .ER1 File on iPhone

Select a file. If you don't see an application to open the .ER1 file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .ER1 File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .ER1 files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .ER1 files

  1. You need to update the application that you normally use to open .ER1 files. Only the latest version of the software supports the current .ER1 file format
  2. You need to check the .ER1 file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)