OK. Trying to resume old incompletes would not be a good idea then or in the future, once the downloads.dat file is suspect or deleted.

So, anyone with really old incompletes should just be advised to save themselves and others grief--remove them.
. . . and to ignore any search results that start with the Tnumber?

I guess I was thinking PFS might also mean additional PF recovery. Of all p2p programs I've tried, LW is the best at resuming incomplete files. It's so easy to forget what a pain interrupted downloads used to be less than a year ago!