Opening a CML File

The CML file type is primarily associated with Avogadro.

CMLFile Extension CML
 File extension: CML
File type:  document

What is a CML file?

CML files mostly belong to Avogadro by Avogadro. CML stands for Chemical Markup Language. CML format, developed by Murray-Rust, and Rzepa, is the standard format used for storing chemical information linked to molecules.

  • Main Use: CML format has been developed with the view of effectively managing molecular data with popular tools such as XML and Java. The popularity of XML has been to use to aid CML developers in creating interoperable documents that can be shared across various software without causing compatibility issues. CML files consist of a variety of data covering molecules, chemical reactions, spectra, and analytical information, computational chemistry, and chemical crystallography.
  • Other Uses: CML also stands for Compressed Markup Language format and stores HTML information in a compact binary form for use in Palm OS web clipping applications. The CML data in the Palm OS devices can then be grouped with image-based web content and then further compressed to output the data in PQA (Palm Query Applications) format. CML file extension is also used by Crazy Machines, a puzzle game, to store game data and facilitates users in grouping levels together. CryptoMailer application also uses CML files in sending secure email attachments using encryption. GIS applications such as gvSIG and WMC Client for ArcGIS store layers and other details of a web map project in XML format as a CML file.

How to open CML files

You need a suitable software like Avogadro to open a CML 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 CML file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a CML file directly in the browser:. Just drag the file onto this browser window and drop it.

Online CML Text Viewer

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Programs that open and convert CML files:

  1. Avogadro by Avogadro
    See the previous paragraphs to learn more about the main application. CML files are often referred to as Avogadro simple text files because this type of file is primarily created or used by this software.
  2. Cheat Machine Library (library file) by Cheat Engine
    Cheat Engine is a tool which is designed to assist in modifying and changing games, independent an internet connection. Additionally, this tool contains other implementations to help debug games, set up system analytics/system inspections and helps protect the system through inspecting memory modifications. This file format is classified as Data. Related links: Cheat Machine Github Library repository
  3. Crazy Machines (saved laboratory file) by DTP Entertainment
    A game to test logic and inventive talent through innovative puzzle-style gameplay. Within Crazy Machines, the player is given various mechanical components and parts, with the objective to complete a Rube Goldberg-style machine in order to advance to the next state within the game. This game uses a physics engine in order to simulate real-world variables such as air pressure, electricity, and gravity. This file format is classified as Game. Related links: Game history Wikipedia:
  4. CryptoMailer (page layout) by CryptoMailer
    CryptoMailer is a secured email alternative which is utilized for sending encrypted files as email attachments from one user to another. Once sent, these files are able to be decrypted by the receiving user if they also have the CryptoMailer program on their machine. Furthermore, CryptoMailer can be integrated with many email services such as Microsoft Outlook, Windows Live Mail or other webmail applications. This file format is classified as Encoded.
  5. Filetopia (collection manager list file) by Filetopia
    Binary format - .CMA is ASCII format. Filetopia is an open-source platform which allows users to share files, chat, and send instant messages while maintaining peer-to-peer encryption using several different cyphers. Furthermore, when sending and sharing files IP addresses are not visible, however, it is noted that the Filetopia software makes little to no effort in maintaining the anonymity of each user. This file format is classified as Encoded. Related links: Filetopia Wikipedia page
  6. PADGen (company info file) by PADGen
    PAD is the Portable Application Description, and it helps authors provide product descriptions and specifications to online sources in a standard way, using a standard database format that will allow webmasters and program librarians to automate program listings. This file format is classified as Simple text file. Related links: ASP PAD Page
  7. ProWORX Nxt (comment data file) by Schneider Electric
    Long - Found in the NxT directory. ProWORX Nxt is an easy to pick up cross-program programming software utilized for Modicon range PLCs. Through this, the user is able to manage their IO subsystems and analyze their plant's activity in real-time all from their familiar and personal Windows environment. However, ProWORX Nxt is largely obsolete rarely utilized within modern applications. This file format is classified as Developer. Related links: Extended user guide

CML file format:

Every file has a defined file format, i.e. how the data is arranged in the file. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). However, different programs can use the same file extension. Furthermore, a file extension can be renamed incorrectly and double-clicking on it will then display an error when it is opened. Exact knowledge of the format is therefore important in order to solve problems occurring in files. Our evaluation of the CML files is as follows:

The CML file extension is rather rarely used and does not have a uniform file format. The two most popular formats are as follows:

All the rest of the CML files (75%) have different formats, frequently e.g. Chemical Markup Language XML document, xzX and wLA. Often described as char, data or save. Just click the "Choose your .cml file to analyze" button on this page to find out what your CML file is.

Technical Data for CML File Extension

File classification:
Simple text file
Related files:
cmldocument, cmml, clm, zip, mol2, eml, xml, ris, docx, sdoc
Related links:
Chemical Markup Language Wikipedia page
Mime type:
chemical/x-cml, text/xml

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: cmlfile, FileType: Chemical Markup Language
ProgramID: CM_WIN.Document
EXEFile: %ProgramFiles%\AFORES~1\CHEATM~1\CM_WIN.EXE

a cml document is a special file format by Avogadro and should only be edited and saved with the appropriate software.

How to solve problems with CML files

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