Support_Guidelines

   Under Extended File Specifications, existing applications and
   layered products that are coded to documented interfaces, as well
   as most DCL command procedures, should continue to work without
   modification.

   However, applications that are coded to undocumented interfaces,
   or include any of the following, may need to be modified in order
   to function as expected on an ODS-5 volume:

   o  Internal knowledge of the file system, including knowledge
      of:

         The data layout on disk
         The contents of file headers
         The contents of directory files

   o  File parsing tailored to a particular on-disk structure.

   o  Assumptions about the syntax of file specifications, such as
      the placement of delimiters and legal characters.

   o  Assumptions about the case of file specifications. Mixed
      and lowercase file specifications will not be converted to
      uppercase, which can affect string matching operations.

   o  Assumptions that file specifications are identical between RMS
      and the file system.

                                  NOTE

      All unmodified XQP applications running on an OpenVMS
      VAX or Alpha system that access an ODS-5 volume will see
      pseudonames returned in place of Unicode or ISO Latin-
      1 names that are not ODS-2 compliant. This can cause
      applications to act in an unpredictable manner.

      Applications that specify or retrieve filenames with the
      XQP interface using ODS-5 disks must be modified in order to
      access files with extended names.