In this example it will notice the files that match *filename* where filename is what they searched by:
on *:text:@find *:#:{
;; If they provided a valid search query then notice them files in C:\dir - change this to the directory you want them to be able to search through
if ($remove($2,*)) .echo -q $findfile(C:\dir,$+(*,$2-,*),.notice $nick - $nopath($1-))
}