I don't know if this helps anyone, but as sumatrapdf.exe is being
discussed and because  I use the ESS distribution via Vincent's
distribution on Windows and it works great I will share my .emacs lines:

  (require 'sumatra-forward)
  (setq TeX-view-program-list'(("Sumatrapdf""sumatrapdf -reuse-instance
%o")))
  (setq TeX-view-program-selection '((output-pdf "Sumatrapdf")))


-- 
*Munawar Cheema *

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