File Extension Library


.CG4 File Extension

  • Developer by: Corel Corporation
  • Category: Bitmap image Files

What are .CG4 files and how to open them?

Can't open .CG4 file? Are you wondering what it contains? On our site we will explain to you what this file is, what it is used for and what software opens the .CG4 file.

What is a .CG4 file extension?

.CG4 file extension is created by Corel Corporation. .CG4 has been classified as Bitmap image Files.

.CG4 is CALS Group IV bitmap graphics

The cg4 file extension is associated with the CALS GROUP IV bitmap graphics format.

The cg4 file stores bitmap image. Most likely some very old file format, but still can be viewed in the CorelDraw Graphics Suite for Windows.

CALS means Continuous Acquisition and Life-Cycle Support and was developer by United States Department of Defense (DoD).

.CG4 file format is deprecated and this file format is no longer supported.

Currently, .CG4 file type is not actively used and is obsolete. This usually happens with system files in older operating systems, files from long-discontinued software, or with previous versions of some file types (documents, projects, images, etc.) that were replaced in later versions of the original programs.


How to open:

Some graphics editors support this format and are capable of its viewing or editting.

How to convert:

Much like any other images, it should be possible to export or convert these files to various image format.

How to fix problems with .CG4 files

  1. You need to update the application that you normally use to open .CG4 files. Only the latest version of the software supports the current .CG4 file format
  2. You need to check the .CG4 file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)