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  Function 13H (decimal 19) deletes all files that match the name specified
  in the FCB pointed to by the register pair DS:DX. The filename in the FCB
  can contain wildcard characters so that multiple files can be deleted with
  a single call to function 13H. The function returns AL = 00H if the
  operation is a success and all matching file directory entries are
  deleted. AL = FFH if the operation is a failure, meaning that no directory
  entries matched.