HELPLIB.HLB  —  Ext File Specs, Using  Directory Specification Differences, Deep Directory Structures
    OpenVMS 7.2 and later supports deep nesting of up to 255
    directories with the restriction that the total directory
    specification must be no longer than 512 8-bit or 16-bit
    characters.

    For example, a user can create the following directories on an
    ODS-2 or ODS-5 volume:

    $ CREATE/DIRECTORY [a.b.c.d.e.f.g.h.i.j.k.l.m]

    A user can create the following directory with a long name on an
    ODS-5 volume:

    $ CREATE/DIRECTORY -
    [.AVeryLongDirectoryNameWhichHasNothingToDoWithAnythingInParticular]
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