Not sure about your original request based on size but below is an alternative if no other found:
If you can place xxx after each image then you can open the word doc with the images, press F11 to open vb editor and run the macro below in the worksheet.
xxx - represents the string to seperate each image and can be changed in the top of the sub.
Images - is the name each file with start with followed by 001 and higher based on the number of files.
You will also get a Message Box count of the number of files with the option to proceed or not.