The figures/images/shapes, not the captions or any other text. Word can store figures in several ways (they can be created within Word, it can be a copy-paste from somewhere, it can be an OLE object), it seems like InlineShape object type picks out the ones I am interested in. And these will then have to be replaced with the contents of the .png files (given the title of the thread, and with .png being an image format, I thought it was pretty obvious that I wanted to replace the images themselves, not the captions or any other textual stuff... images/figures only) in a sequential order.

Like I stated in my original post, the tool I am working with does not import all Word figures, but if I replace all figures with the ones exported to .png, all get imported. However, manually replacing all figures in a few hundred documents is something I am hoping to avoid...