The File Extensions Database


.CG4 File Extension

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

What is an .CG4 file?

.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).

This cg4 file type entry was marked as obsolete and no longer supported file format.

This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their 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 solve problems with CG4 files

  • Associate the CG4 file extension with the correct application. On :
    Windows: Right click on any CG4 file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.CG4 files". Mac: Right click (or Ctrl-click) the CG4 file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .CG4 is CALS Group IV bitmap graphics. Because only the current version supports the latest CG4 file format. Search, therefore, e.g. on the Corel Corporation manufacturer website after an available .CG4 is CALS Group IV bitmap graphics update.
  • To make sure that your CG4 file is not corrupted or virus-infected, get the file again and scan it with antivirus software.