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Details of the .er1 file extension

The table below provides useful information about the .er1 file extension. It answers questions such as:

  • What is the .er1 file?
  • What program do I need to open a .er1 file?
  • How can the .er1 file be opened, edited or printed?
  • Where can I find the specifications for .er1?
  • Which MIME-type is associated with the .er1 extension?
  • How can I convert .er1 files to another format?
  • What are other, similar filename extensions to .er1?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

.er1 file extension details

CA ERwin 4.x Diagram

CA ERwin 4.x Diagram .er1 file icon
ER1 file is a CA ERwin 4.x Diagram. CA ERwin Data Modeler (ERwin) is a software tool for data modeling (data requirements analysis, database design etc) of custom developed information systems, including databases of transactional systems and data marts.
Category: Document files
Application: CA ERwin Data Modeler
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
ER1 aliases:
ER1 related links:
ER1 related extensions:
Microsoft Visio Diagram

CA ERwin Diagram

CA ERwin Document

CA ERwin Template

CA Report Template Builder Document

CA ERwin Exported Data Model

Other types of files may also use the .er1 file extension.

.er1 file extension error

The .er1 file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

erl, r1

Is it possible that the filename extension is misspelled?

We found the following similar file extensions in our database:

Erlang Source Code
Lotus Symphony Spreadsheet
open .er1 file

Can't open a .er1 file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .er1 file association, check the FAQ.

.er1 file extension

Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .er1 file extension, write to us!

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