NotePad++ helps me find details in files everyday; the filter wildcard function does not stop all the files I want turning up in the list. Some times that is good so it is ok as it is.
However I would like the option to close files in the returned list that are not required; so I can concentrate on getting the list correct and not inadvertently walk through the wrong file.
Just select the header for the file you don't care about ahd hit Delete. I haven't tried clearing several files in a single sweep though.