leave the search box empty, but fill in a match string in the field "File Names to match" at the bottom right, just above the results pane. The click the search button.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
leave the search box empty, but fill in a match string in the field "File Names to match" at the bottom right, just above the results pane. The click the search button.