Opens the file for writing. The following restrictions apply to
    the /WRITE qualifier:

    o  Use the /WRITE qualifier to open and create a new, sequential
       file. If the file specification on an OPEN/WRITE command does
       not include a file version number, and if a file with the
       specified file name and file type already exists, a new file
       with a version number one greater than the existing file is
       created.

    o  Use the /READ qualifier with the /WRITE qualifier to open an
       existing file. While the file is open, no other user will have
       access to it. When the file is first opened, the pointer is
       positioned to the beginning of the file. (This differs from
       OPEN/APPEND, which positions the pointer at the end of the
       file.) You cannot use OPEN/READ/WRITE to create a new file.

    o  The /WRITE and the /APPEND qualifiers are mutually exclusive.