M4 File Type

- The quick facts

What are M4 files and how to open them

Are you having problems opening a M4 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 M4 file?

A .M4 file is a m4 preprocessor / macro source file.

We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

How to open M4 files

Important: Different programs may use files with the M4 file extension for different purposes, so unless you are sure which format your M4 file is, you may need to try a few different programs.

While we have not verified the apps ourselves yet, our users have suggested 4 different M4 openers which you will find listed below.

Last updated: September 2, 2014

Suggest another file format using extension M4

While we know of one file format using the .M4 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 .M4 file.

Various apps that use files with this extension

These apps are known to open certain types of M4 files. Remember, different programs may use M4 files for different purposes, so you may need to try out a few of them to be able to open your specific file.