I think I spoke too soon.
Here's what happened:
New 1st time install (did not delete old .mdb from Program files)
Building database said:
12,684 files, leaving 10,824 songs (1,976KB)
(received dup ID message)
Where did 43 files go?
Deleted prior .mdb and .mdb from Program Files
Restarted Hoster, it started Building automatically:
Now it said there were only
12,641 files, but only 10,751 songs (3,824KB)
(did not receive any message about there being any dupes)
Before anyone asks, NO, I DIDN'T ADD, DELETE OR EVEN PLAY ANY SONGS, so there is NO REASON that the number of files I began with should be any different.