A family of Microsoft word processing software products for creating web, email, and print documents.
Add .zip to the end of the file name. That "converts" it into a zip format that Explorer will recognize. Then you can double click on the zip to explore the underlying file structure. Go into the Word folder then the Media folder to see the inserted image files.
That won't tell you the original filename - they simply get given names like image1.jpeg, image2.jpeg, etc.
Unless the images have been inserted as links to the original files, there is no direct way of retrieve the original filenames in a docx file. An indirect way is to do the zip conversion then look in the document.xml file. Original picture names will be within tags looking like:
<pic:cNvPr name="MyPic.JPG" id="0"/>
If the images have been inserted as Links, you can circumvent all that circumlocution by going to File|Info>Edit Links to view the filenames there.