NUMBER:  26

  ERROR CODE:  F

  MESSAGE TEXT:  OPEN or DEFINE FILE required for keyed or direct
  access

  EXPLANATION:  One of the following conditions occurred:

   o  A direct access READ, WRITE, FIND, or DELETE statement
      specified a file that was not opened with a DEFINE FILE
      statement or with an OPEN statement specifying ACCESS='DIRECT'.

   o  A keyed access READ statement specified a file that was not
      opened with an OPEN statement specifying ACCESS='KEYED'.