CG4 file format description

Many people often share .cg4 files without providing instructions on how to use them. This can make it difficult for users to determine which program is compatible for editing, converting, or printing .cg4 files. To address this issue, we have created this page to offer assistance and guidance on handling .cg4 files. We provide information on compatible software, editing instructions and conversion options to help users effectively interact with .cg4 files.

Our aim is to simplify the process and promote seamless use of the .cg4 file format.

1 filename extension(s) found in our database.

.cg4 - CALS Group 4 Bitmap

The CG4 graphic files are related to reaConverter. The CG4 file is a CALS Group 4 Bitmap. CG4 is a raster format associated with CALS (Continuous Acquisition and Life-Cycle Support) program.

Graphic files
- / -
CALS Group 4 Bitmap related extensions:
CALS Group 4 Type 2 Bitmap
Apple QuickTake Picture

Naturally, other applications may also use the .cg4 file extension. Even harmful programs can create .cg4 files. Be especially cautious with .cg4 files coming from an unknown source!

Can't open a .cg4 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 can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .cg4 file extension is often given incorrectly!

Based on searches conducted on our site in the past year, we have compiled a list of the most common misspellings. These frequent misspellings can cause confusion and hinder search accuracy. By providing this list, we aim to assist users in finding the correct information more easily and improving their overall search experience on our site.

These misspellings were the most common in the past year:

c4, c4g, cb4, cf4, cg, cgr, cgt, ch4, cr4, ct4, cv4, g4, sg4, xg4

Is it possible that the filename extension is misspelled?

There is a possibility that the .cg4 filename extension is misspelled. To assist users in identifying potential errors, we provide a list of similar file extensions in our database.

Filename extensions similar to .cg4:

Catfish File Manager Support Data
STABCAL Calculation Data
CaseMap 4 Template
SmartCAM Code Generation Template
Corel Paradox Index File
Guitar Chord Groover Chord

Operating systems

At, we strive to provide a seamless user experience by ensuring compatibility with a wide range of operating systems. The following is a comprehensive list of the operating systems currently supported by

Windows XP/Vista, Windows 7/8/10, Windows 11, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, macOS, Mac OS X, iOS, Android

If you find the information on this page useful, please feel free to link to this page.

If you have useful information about the .cg4 file format, then write to us! >> CG4 file