Wild Cards:
Basic File Masks in the File Operations dialog use the same wildcard characters as the DOS dir command - the * and ? characters.
%n is an extended operator for renaming files that may be used in the Mask To field to reference wild cards in the Mask From field. E.g., Mask To: Win9?.* Mask To: %1Win9.%2.
# is another extended operator used for numbering files.