Hi there,
As per your instruction above, I think I am capable to help since I play around with VBA and C# a lot.
Beside the dialog box for asking the beginning code and inserting textbook with the valid picture.
I think that exporting all pictures, with the assigned name, into a folder under the same location of the word file may be a better way for you, instead of decompress the file and get the pictures manually.
Once you are ok with the suggestion above and the code developed, you can copy and paste the code into the file VBA window and use it directly.
Please let me know if it is good enough.
regards,
Patrick