Next time you have trouble importing a legacy Word .doc, try
this:
In Word, create a new file using the New command and the
default .dot.
Insert the contents of the legacy .doc from the menu command
(not by cutting and pasting).
In Word 7, they moved the "insert file" command to Insert
> Object > Text from File . . .
I'd think "insert text from file" would mean pasting
something that doesn't include graphics. However, Word will bring
in everything from the legacy .doc including formatting and styles.
Save As . . . the new document as .doc or .docx. I don't
think RH 7 cares. In our experience, jpegs and gifs sometimes were
missing until we created the new Word file.
Another wrinkle: In Explorer view, with a folder open, File
> New allows you to create an empty Word document right there.
We had some trouble using one of these for importing and saving the
legacy .doc.
Didn't have time to track it down. Was the legacy .doc
created in Word 2003, and the conversion to .docx in 2007 glitched
some images? In your case, it just happened to the .png files? As
you previously speculated, images may have been handled differently
in creating the original .doc.
My hypothesis here is, whatever the reason for images getting
lost in the import to Word, everything gets fixed -- even for pngs
-- when you start with a clean slate in a new Word document created
from the New menu in Word.
Harvey