.CG4 File

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.