I would be using it to notify others of updated files so that I don't have to go around telling everyone 'check your directory for new files' or relying on them to check for updates. Has nothing to do with viruses or such. I suspect that once past the initial code of the directory structure. That it could easily scale to several directories. If it monitors a directory and it's subdirectories then all I would need is 1. If it didn't do subdirectories then I would need to monitor 6 individual directories.
Back in the 'Old' days when I ran a BBS that received files from a satellite system, I had written a program that did this in order to initiate other actions... zip/unzip, create a message to notify users of file availability & automatically re-distribute files to other BBS's. I was one of the area hubs for fidonet mail & file distribution. But that was a Dos based environment, I haven't done any windows programming.
Thanks, I'll check it out.