Opening CM Files

The CM file type is primarily associated with Grand Theft Auto: San Andreas.

CM	File extension: CM
	File type:	custom mission

What is a CM file?

CM files mostly belong to Grand Theft Auto: San Andreas by Rockstar. A CM file is a custom mission that can be added to Grand Theft Auto: San Andreas video game. This file is similar to a CLEO script (CS), however, it is saved as a mission using Sanny Builder game modification utility. A CM mission file can be imported into Grand Theft Auto: San Andreas by placing it in the CLEO\ subfolder of the game's installation directory. Another type of CM file is a puzzle used by the Puzzle game bundled with some versions of X-Window system. CM is also the filename extension of copy protection code files used by CopyMinder software protection/licensing software.

How to open CM files

You need a suitable software like Grand Theft Auto: San Andreas to open a CM file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your CM file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CM file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CM Text Viewer

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Programs that open and convert CM files:

Grand Theft Auto: San Andreas by Rockstar
See the previous paragraphs to learn more about the main application. CM files are often referred to as Grand Theft Auto: San Andreas games because this type of file is primarily created or used by this software.
CopyMinder (copy protection code) by Microcosm
CopyMinder is a software protection and licensing software package. It uses a CM file to save copy protection code. This file format is classified as Data.
Puzzle (puzzle) by X.Org Foundation
Puzzle is a 15-puzzle computer game bundled with some versions of X-Window system. It saves a puzzle an 8-bit bitmap in a CM file. This file format is classified as Game.
Sanny Builder (custom mission) by Seeman
Sanny Builder is a software package for modifying some aspects of Grand Theft Auto video game series. A custom mission created with Sanny Builder is saved in a CM file. This file format is classified as Game.

CM file format:

Each file has a definite file format, that is, how the stored data is arranged in the file. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. Knowledge is power - this also applies when dealing with unknown or faulty files. In the following you will find our evaluation of the CM files:

The CM file type is used by many programs, each with its own file format. However, the following two file formats are common:

10% of all CM files are The Chessmaster 2000 saved game files. These are binary files, so they do not contain words or text. The average file size is 9 MB with most files being between 460 bytes and 13 MB in size. The following keywords are characteristic: CMM1.
10% of all CM files start with the magic bytes 03 01 01, which are always the first bytes of this file format. These files are binary files, so they do not contain text, but only cryptic characters. CM files are between 76 bytes and 4 KB in size. The file name config.cm is typical for these files. These files can be linked to gims.

All the rest of the CM files (80%) have different formats, the following 9 formats can be found: JSON, config, ZIP, CUST, semaphore and echo. Tagged as record, digital, zenno, licen, amazonvip, recaptcha, arris, macro or model. If you want to find out what your CM file contains, drag and drop it onto this page.

Technical Data for CM File Extension

File classification:

Game

Related files:

cm0013, cm0012, cm_, crn, notd -, cm], cmdb, cmpp, txt, zip, ct, com, icm, wav, cs, z01, ctm, 1, pdf, json

Mime type:

application/octet-stream

The following listing is compiled from the database produced by the 'Associate This!' program, selected data from the main FILExt database and file extension information submitted by users.

ProgramID: PerfectScript
EXEFile: %ProgramFiles%\Corel\WordPerfect Office 2002\PROGRAMS\PS100.EXE /# /m

ProgramID: PerfectScript
EXEFile: %ProgramFiles%\WordPerfect Office 11\Programs\ps110.exe /# /m

ProgramID: Raw.pcm.audio.file
EXEFile: %ProgramFiles%\Adobe\Audition 1.5\Audition.exe %1

ProgramID: Raw.PCM.audio.file
EXEFile: %ProgramFiles%\coolpro2\coolpro2.exe %1

ProgramID: EasyContactManager.Document
EXEFile: %ProgramFiles%\EasyOffice\EASYWORD.EXE %1

ProgramID: EasyContactManager.Document
EXEFile: %ProgramFiles%\EasyOffice 2001\EASYWORD.EXE

ProgramID: EasyContactManager.Document
EXEFile: %ProgramFiles% PER UFFICIO\EASYWORD.EXE

Show all 7 listings To Top

a cm custom mission is a special file format by Rockstar and should only be edited and saved with the appropriate software.

How to solve problems with CM files

Associate the CM file extension with the correct application.
Update your software that should actually open custom missions. Because only the current version supports the latest CM file format. Search, therefore, e.g. on the Rockstar manufacturer website after an available Grand Theft Auto: San Andreas update.
To make sure that your CM file is not corrupted or virus-infected, get the file again and scan it with Google's virustotal.com.
Click here to open your .CM file online - secure, fast, and no downloads needed.