Incorrect File Specification

  The file name you have provided is not valid.  Retype it using
  valid characters:

          A  -  Z       0  -  9
          a  -  z       underscore  (_)
          hyphen  (-)    dollar  sign  ($)

  A file name is a 1- to 39-character string that provides a
  name for a file.

  A file type is a 1- to 39-character string that usually
  identifies the file in terms of its contents.  File types
  must be preceded by a period.  For example, if you had a

  Calendar file containing appointments, you might name it
  APPOINTMENTS.DWC.