A file to store text created using free software based on OpenOffice. It’s used to store books, reports, notes, and other textual information. The file has an XML structure, is used as an alternative DOC format and has an open source code.
A file with the DOCM file extension is a Word Open XML Macro-Enabled Document file used in Microsoft Word. It was introduced in Microsoft Office 2007. DOCM files are just like DOCX files except that they can execute macros, which lets you automate repetitive tasks in Word.