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Open file in specified window in emacs

How do I specify a window in emacs that will be used to open a new file / buffer for?

When I open a file, say when using a command o

, it opens in a new window. But I want this file to be opened in the window that I specified exactly.

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(defun dired-window () (window-at (frame-width) 1))

(eval-after-load 'dired
  '(define-key dired-mode-map (kbd "o")
     (lambda ()
       (interactive)
       (let ((dired-window (dired-window)))
         (set-window-buffer dired-window
                            (find-file-noselect 
                             (dired-get-file-for-visit)))
         (select-window dired-window)))))


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