CMU File - opening and understanding

Did your computer fail to open a CMU file? We explain what they are used for and recommend software that we know can open or otherwise handle your .CMU files.

What is a CMU file?

A .CMU file is an Andrew Toolkit Document file. These CMU files are documents created in Andrew Toolkit, a set of tools used to create documents. Andrew Project was one of the first distributed computing solutions, and it provided students and teachers access to various software on computers placed on the university campus. It was developed by Carnegie Mellon University and IBM in the 1980s.

How to open CMU files

You will need a program compatible with the specific file you are trying to open, as different programs may use files with file extension CMU for different purposes.

While we have not verified the apps ourselves yet, our users have suggested 3 different CMU openers which you will find listed below.

Other file formats using extension .CMU

While Andrew Toolkit Document is a popular type of CMU-file, we know of 2 different uses of the .CMU extension.

The CMU file extension indicates to your device which app can open the file. However, different apps may use the same file extension for different types of data. So a CMU opener may not be able to open all kinds of CMU files. In this case, look through both formats to make sure you find the best suited CMU viewer.

CMU Window Manager bitmap

Through our analysis of CMU files, we know that one use of the format is CMU Window Manager bitmap. 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.

While we have not verified the apps ourselves yet, our users have suggested 3 different CMU openers which you will find listed below.

Various viewers for this file format

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

CSMCSMUser submitted
ZaZ GP4 ToolsZaZ GP4 ToolsUser submitted
Techsoft PixEditTechsoft PixEditUser submitted
We have not verified any software that we know for certain will work with CMU-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 CMU-files. If you know one, please use the 'Suggest a program' link below and tell us about it!