4    DBCMD/1010     Illegal characters in alias (USE command)
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      Problem: An attempt was made to create an alias
      that was not a valid identifier. This occurs if the
      system creates a default alias based on the file
      name and the file name contains illegal characters
      (i.e., TEST$.DBF) or is otherwise an invalid
      identifier (i.e., 123FILE.DBF).

      Solution: Provide a valid alias identifier via
      the ALIAS clause.

      Note: A legal identifier can contain alphabetic
      characters, numbers, or the underscore symbol (_);
      but must begin with an alphabetic character.