The "M" of DOCM stands for macro. Macros are programs embedded in Office documents used to automate different tasks. Staring from Word 2007, DOCX documents that contain macros are saved with the DOCM extension.
DOCX is an XML based word processing file developed by Microsoft. DOCX files are different than DOC files as DOCX files store data in separate compressed files and folders. Earlier versions of Microsoft Office (earlier than Office 2007) do not support DOCX files because DOCX is XML based where the earlier versions save DOC file as a single binary file.
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