Open M files

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    Objective-C Language Source Format
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Have you encountered a problem with a M file? Don’t you know which program opens a file with this extension? You will find all the information you need about working with a M file here. In the further part of this page we have added a list of programs that should open your M file. It is enough you choose a proper application for your operating system, download and install it.

What is M file?

The file extension M identifies so-called Desktop Color Separation (DCS) Specification files, the M file containing only the data for the magenta color layer. The DCS is a collection of EPS format based files for the different color layers. (In the CMYK color model, of course, these are c, y and k files in addition to the M file)

More info

DCS files are mainly used for data exchange of bitmap images between different prepress step applications, but sometimes also vector and text data are used.

The format developed by Quark exists until version 2.0, which was introduced in 1995. From version 2.0 it was possible to save all color layer files in a single file (extension dcs). Meanwhile, the DCS system is no longer recommended for use with CMYK due to better alternatives and common problems.

Programs which can open a M file

How to open file with M extension?

In order to open a file with M extension one of the following programs must be installed on user’s system. If a problem with opening M file occurred, it is highly possible that none of the listed programs is present on user’s system. Even if one or more said programs are installed, there may be issues related with given programs. In order to solve a problem with M files, follow the instructions below.
Install BBEdit or other program from the list

Most often resolving problems with opening M files is very simple. Just install an appropriate program that supports such files. All of the listed programs support M files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of M files or offer file conversion options, but may not be capable of editing such files.

Set BBEdit as the default program for opening M files

It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate M files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the BBEdit applications is not on the list, select "Browse" option in order to manually locate the directory where BBEdit has been installed.


Check the section that lists most common problems with M files

Sometimes problems with opening M files may not lie with the application itself, but can arise due to other causes, such as:

  • File data is corrupted
  • M files has been not been completely download from the internet (only a part of the data has been downloaded)
  • Currently used user account hasn’t been granted necessary privileges to open M files (should that be the case, please contact your system administrator or IT specialist)
  • M file was being copied from a corrupted storage device and is incomplete or data is corrupted. (Copying files from unknown or untrusted sources should be conducted with great care as such files may contain malicious software, which can damage your system)

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