This script is actually pretty nice at first glance. I used it to collect important data from clients and store it in the flatfile database.
However, I quickly realized that it doesn't work correctly. When you check entries for deletion, it's iffy at best whether they will actually be deleted. Also, upon refreshing the page, some entries might disappear, or the entire file might be wiped out.
Several emails (5 or 6) to the author of this program have gone unanswered.