If you rename the extension of a DOCX file to ZIP and open the ZIP file using Windows Explorer (in order not to mess up the compression), you will see a folder named word.
Inside this word folder are other folders of interest:
The embeddings folder has the objects such as Excel tables or PowerPoint slides described in previous posts. The bitmap graphics or pictures are in the media folder, however:
The view inside the media folder above shows one bitmap graphic (the JPEG file) and various other files with images of the embedded objects (an equation, and Excel table and a PowerPoint slide). Only the bitmap files are of real interest. If other graphic files localized for the target language are named the same as the original files in the media folder and substituted there, when the ZIP files is renamed to have its original extension, the substituted graphics will appear in the document the next time it is opened.
This way, for example, screen shots for an entire file can be substituted quickly. One could, of course do this by a number of other means, but this way is fairly convenient and could probably be automated without much ado if your organization needs to make such substitutions a lot.
Addendum: I was curious about those other files in the media folder - the ones with the views of the embedded objects. So I deleted them to see if they would re-generate when the document is opened. Instead, this message was displayed at the location of each object:
Double-clicking the "broken" object display opened the object and restored the view. So clearly, refreshing object views involves updating the content of the media folder.
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