Hello Jean-Marie:
I had given this up for the day, but decided to make sure one more time. Tried with the modifier keys (again).
I got an error to the effect that "this document cannot be opened in this version of Quark".
I looked at the doc icons, I looked at info... realized the icons said "unix executable file", and the resource forks had been busted off.
So I dug around on the network for a quark doc that hadn't been busted (from OS9) and it converted perfectly (or close enough). No mod keys required.
Yes, imagine my panic running from machine to machine trying to find that SET of chapter files to a 436pp book that's due for it's 3rd edition and umpteenth printing.... LOL. Even funnier, some months ago we had to manually copy/paste and totally reformat text out of an ancient copy of "ReadySetGo" (if anyone remembers that!) and re-lay it all out in Quark. The layouts were done but for updated text, tweaks, photos and finalized data on new research.
I'm sure you can hear the insane and maniacal laugh from where you sit :)
All is well, the last edited set was found intact. I converted a couple of random docs and other than missing fonts (which, I have handy) it looks perfect (or close enough!)
Quark wins, InDesign goes on the back burner for now.
I know how to bust resource forks off of files the easy way. Just put them on a non-mac formatted SD card, and move them from an OS9 to an OSX machine...Not that I have any clue of what good that would do anyone!
Thanks for the reply that gave me the little "push" to try again and find the answer I needed :)