This is a format created in the Acorn Draw program, intended for image visualization by using vector lines. It’s used for storing information in the publishing business (brochures, logotypes, etc.). The main advantage is it’s high quality source images when printing. It’s been in use since 1980.
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.