Hmm, you're right. If I copy the prefs.prop file, the dates, names, descriptions are all preserved.
I guess it's a toss-up then on copying that file. But for me, copying that file means some really WEIRD video behaviors when I start the game, depending on what my graphics settings in Windows were. But then I can just re-apply my graphics settings, and everything's okay.
I'll play around with it a little more, and wait for some more feedback - then I'll edit the original message to reflect all this.