Advice on unzipping

Example of pre

   **STOP since error during read from unit number 19.
      (IOSTAT value is 111.)
  
   (ERROR RETURN FROM ROUTINE: POSFIL)
   (E--READ ERROR)
   (ERROR RETURN FROM ROUTINE: TGSIM )
   (ERROR RETURN FROM ROUTINE: SSEQB)
   (ERROR RETURN FROM ROUTINE: Main Program)