Coloque em .emacs
este trecho de código
(defun restore-saved-window-size()
(unless (load "~/.emacs.d/whsettings" t nil t)
(setq saved-window-size '(80 30)))
(nconc default-frame-alist '((width . ,(car saved-window-size))
(height . ,(cadr saved-window-size)))))
(restore-saved-window-size)
(defun save-window-size-if-changed (&optional unused)
(let ((original-window-size '(,(frame-width) ,(frame-height))))
(unless (equal original-window-size saved-window-size)
(with-temp-buffer
(setq saved-window-size original-window-size)
(insert (concat "(setq saved-window-size '"
(prin1-to-string saved-window-size) ")"))
(write-file "~/.emacs.d/whsettings")))))
(add-hook 'window-size-change-functions 'save-window-size-if-changed)
Funciona muito bem no meu Windows XP
Para atalho, pode criar o arquivo chamado emacs.cmd
in %system32%
folder com o seguinte conteúdo: C:\
path-to-emacs
\bin\runemacs.exe %*
para poder iniciá-lo a partir do cmd em qualquer lugar.