The Question is:
Will a compiled v7.1 FORTRAN .EXE run on v6.2
The Answer is :
Downward (or backward) compatibility of images is not officially
supported, and is known to not operate in various cases.
The official support for application image compatibility is upward
only -- you must compile and link on the oldest version that will be
supported. User-mode applications and code constructs -- barring any
latent errors, of course -- are expected to operate successfully on
later OpenVMS versions.
There are various unsupported approaches that have been attempted
over the years including redirection of the LINK at older RTL images,
but these approaches all have a similar limitation: without testing
on the target version, it is difficult to predict if the images will
work in the target (older) environment. And once a target testing
environment is available, you might as well build there, too...
Please see topics (3761), (5192), and (6829).
Related topics include (173), (866), (1052), (1171), (1904), (2738),
(2932), (4336), and (6049).