Thanks, all.

So I've been confused by my knowledge of the way the ancient WPDOS did it?
It's just a mirror of the Windows fileopen dialogue, with extra buttons on
top? It looked much more complete, on cursory (and ignorant, and only five
seconds) inspection - and didn't have the usual useless favorite buttons on
the left.

The user says the ringers do NOT appear in Explorer. I'll check on his
veracity when next I visit (g).