Need to alert on 0K files with varying file name

We have an ftp application which pulls in files from a credit card vendor. A file comes in each night. We need to alert on whether there is a 0K file in the directory preferably based on date. Just a 0K file would be fine. However, the file name changes so we need to use a wild card.

Is this possible. It seems the file size monitor does not accept wild cards. There was a post with a VB script but it didn't return the right information for the monitor to produce a status according to the post.