Files that contain the the .mml file extension are associated with the Adobe Maker Markup Language. This language is used by the Adobe FrameMaker publishing application.
Adobe FrameMaker is used to publish large structured documents. The MML files that are used by this software contain the formatting information for an associated FrameMaker document, such as the page layout, text, graphics and other FrameMaker page properties.
The MML files that are used by the Adobe FrameMaker program are stored in ASCII format.
The .mml file suffix is also used by the MolMol science software. These MML files contain molecule description files that are referenced during the use of the MolMol software application.
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If you have additional information about the MML file format or software that uses files with the MML suffix, please do get in touch - we would love hearing from you.