Here’s a great wee tip which I discovered here, solving an issue which has bugged me for years.
If you need to extract images from a Word file that someone has supplied, at their original full resolution, just:
Open then Save it from a current version of Word as a .docx file
Duplicate and rename the Word file, changing the extension from .docx to .zip
Open the unzipped directory and navigate to /filename/word/media/
Voilà! There they are.