how to tell whether current OS is Windows 7?

Drew Adams <[email protected]>
Newsgroups gmane.emacs.windows
Message-ID <af20151c-d96d-4494-89dc-ae9b9ad2c7ab@default>
Certain things do not work in certain Emacs versions with Windows 7
(and perhaps Vista and Windows 8; dunno).

Can one detect, from Emacs Lisp, whether the current Windows version
is Windows 7 (or whatever)?  If so, how?
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