Frame 8-compatible file format?

[Lise Bible]

Framers,
A little googling did not clarify anything for me, so I thought I'd ask
here.
I'm on Frame 8; none of the added features in subsequent releases seemed
relevant enough to me to justify upgrading (and it works fine for me on
Windows 7).
The issue I have is that I need to send some manuals out for quote to be
translated, and I want to make sure that the files they send back to me,
can be opened in Frame 8. (I figured it's better to clarify upfront, rather
than chance running into issues later. I have no idea what the translation
companies are able to provide, but Murphy dictates that if I don't clarify,
I'll run into issues.)

Now, I know you can't save a file opened in Frame 12 directly as a Frame
8-compatible file, but it looks like you can save as .mif--can that be
opened in Frame 8?
According to this thread, https://forums.adobe.com/thread/1379901, there
are two different MIF versions?
What format do I need to request they return, so that I can open the
translated files, once translated?

Thanks,
Lise
-- 
*Save the earth.* It's the only planet with chocolate.
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