I tried getting it to talk to my PC and using a network connection, but the super-long names on iMac that we used them from moving over (no idea why).
As you said, trying a portable HD failed because of the different formats.
FINALLY GOT I!
I bought a 64G USB drive.
No real formatting so the iMac read it fine.
Zipped everything and just moved them onto the USB drive.
Plugged it into the PC and moved the zipped files over.
One thing - as they unzipped there were questions about encryption.
I just said to ignore the problem and everything unzipped just fine!
Now to wipe the iMac's HD with a system restore and sell it....
I'm just not an Apple person.
A fun experiment, but...not for me.
Thanks again.