I have only tested this on Powerpoint, but I read that it works on other files as well. Essentially, if you get a file with a lot of pictures and you want to extract them easily, follow this method to either delete the files to shrink the file size, or extract them separately:
control folders=> Show file extensions
Make a copy of the file in case you mess it up beyond repair.
Rename the file extension to
Delete the files in the “embedded” folder.
Rename extension back to
Open the file.