Reopen_Count=n

    The Reopen_Count=n qualifier allows you to specify how many
    records are written to an output file. The output file will
    be re-created (that is, a new version of the file will be
    created) when the record count reaches the specified value.
    The Reopen_Count=n qualifier is only valid when used with the
    Record_Definition or Rms_Record_Def qualifiers.