CMG File Type

- The quick facts

What are CMG files and how to open them

Are you having problems opening a CMG file or just wondering what they contain? We explain what these files are used for and show you software that we know can open or otherwise handle your files.

What is a CMG file?

A .CMG file is a Cramfs ROM filesystem package file. Through our analysis of CMG files, we know that one use of the format is Cramfs ROM filesystem package. We have not yet described in detail what these files contain and what they are used for, but our team is working tiredlessly through thousands of file formats. We'd love hearing from you if you have information about the format.

How to open CMG files

Important: Different programs may use files with the CMG file extension for different purposes, so unless you are sure which format your CMG file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 2 different CMG openers which you will find listed below.

Last updated: March 25, 2012

Suggest another file format using extension CMG

While we know of one file format using the .CMG file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .CMG file.

Various apps that use files with this extension

These apps are known to open certain types of CMG files. Remember, different programs may use CMG files for different purposes, so you may need to try out a few of them to be able to open your specific file.

HxD Hex EditorHxD Hex EditorUser submitted
Sublime TextSublime TextUser submitted
We have not verified any software that we know for certain will work with CMG-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with CMG-files. If you know one, please use the 'Suggest a program' link below and tell us about it!