bug#16087: Setting HOME environment variable in Emacs on Windows has side effects

[SDS]

Package: emacs
Version: 24.3.1

When running "emacs.exe -Q" for precompiled Emacs binaries on Windows, 
and after setting the HOME environment variable to a path different than 
the registry's HKCU\SOFTWARE\GNU\Emacs\HOME, attempting to access the 
old HOME directory returns the new HOME directory.

The steps to reproduce the bug are as follows:
1) Set the registry key "HKCU\SOFTWARE\GNU\Emacs\HOME" to "C:\Old\Home"
2) Run "emacs.exe -Q"
3) In a scratch buffer, evaluate "(setenv "HOME" "C:/New/Home")"
4) Using Dired (C-x d), open "C:\Old\Home"
5) The directory in the new Dired buffer is "C:\New\Home"


Cheers,

SDS