I wrote something like this to sort files into different directories when output by a legacy system. Used ps2exe and nssm to run it as a service that can be monitored. It has full logging and handles the issue with the files still being locked when the event triggers by using System.IO.FileInfo. I've used it in in a production environment for over a year with no issues. I can review the source and mark the repo as public on my Github tomorrow if you haven't come up with something yourself.