The OPEN command opens an existing internal file.

    Before you issue the OPEN command, you will most likely want
    to reserve your file. Reserving the file allows you read/write
    access. If you do not reserve the file, you have read-only
    access.

    Once you have issued the OPEN command, exit from CDO. Set default
    to the repository files directory that contains the file, and use
    the commands appropriate for your system to examine or edit it.

    After you have finished with the file, return to CDO and issue
    the CLOSE FILE_ELEMENT command at the CDO prompt.