Ok, you can see the hour, as the weekend went to finish the project of the week. Do not ask 
I redid the swap of 16-version for 9-version 7zip.exe and .dll, in the expected place. I used the 32-bit versions for your reasons, while all work done on a 64-bit Win10 fatally up-to-date system. Actually, that last Win update seems very good, and I have excellent stability.
Then, I’ve imported several different kinds of exports from a pretty complicated InDesign paper. Especially docx, doc, and rtf. I’m aware I think that you’re interested in output from Scrivener, rather than import, but seemed a decent way also to get complex text. I couldn’t do it straightforwardly without buying plugins, so I exported to HTML, then had Word 2013 read that and export to a handful of formats, which it seemed to do reasonably well.
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the imports to Scrivener pretty much lost embedded pictures. This probably is not at all Scrivener’s fault, rather Word’s importing a particular flavor of html. There were warnings about it, and I didn’t have time to look into those or make better. So, I embedded a fresh pic or two straight into Scrivener, in appropriate positions, and resized in Scrivener so as tofit the margins.
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then, I exported to docx, doc, and rtf.
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The basic thing to say is that it seems everything came through that’s expected. See what you think from these items.
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all text looks all there and correct over a 20-page-plus formal paper. That includes Chinese, Korean, and Japanese characters, in addition to standard and fairly English English.
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fonts in the text are correct, both Roman and Asian, for example proper Myriad and Minion on titles and body text.
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there’s no connection to Word Styles, but from Windows Scrivener at this point I don’t think we expect any, unless I remember vaguely a pretty manual procedure, or redoing them with reasonable efficiency after the fact. In short, I think no problems here.
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the images I put in came out well. Some different sizing between doc, docx, and rtf, but iwithin any margins, and I don’t think that’s what you’re interested in.
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Rulers and their margins came through on both doc and docx, when there were any on the original, so again I think you’re ok there also.
Jennifer, I hope for usefulness here to the point that it sounds like doing your own tests.
I hadn’t time to look into why zip is involved, but I guess it may be a basis for keeping down the size of the MS protocols, binary/html or xml for docx. If that’s it, a general compression, I think results look confidence-inspiring.
Trying some other documents to beat it up should give some closure. Very easy to get the zip parts using 7zip on its own installer; I zipped up the old ones in a separate folder to hide them but keep around.
Hope this helps, and apologies time’s so limited…
Clive
p.s. and Scrivener’s backups seem to reopen fine; not sue if this 7zip is what’s used for those, and from what you asked, think not.