How to get package `dired-icon` to show icon images in Dired?

Question

I installed the package dired-icon and restarted Emacs. I then ran

M-x dired-icon-mode

But no icon shows up in Dired mode and in the minibuffer the following message is shown:

Opened text-plain.png in external program

In my init.el file:

(add-to-list 'load-path "~/.emacs.d/elpa/openwith")
;; https://github.com/emacsmirror/openwith
(require 'openwith)
;; Settings for package "openwith"
(when (require 'openwith nil 'noerror)
  (setq openwith-associations
        (list 
     (list (openwith-make-extension-regexp '("doc" "docx" "rtf")) "word" '(file))
     (list (openwith-make-extension-regexp '("mpg" "mpeg" "mp3" "mp4" "avi" "wmv" "wav" "mov" "mkv")) "vlc" '(file))
     (list (openwith-make-extension-regexp '("pdf")) "FoxitReader" '(file))
     (list (openwith-make-extension-regexp '("bmp" "gif" "jpeg" "jpg" "png" "tif")) "xnview" '(file))
     (list (openwith-make-extension-regexp '("rdp")) "Remote Desctop Connection" '(file))
     (list (openwith-make-extension-regexp '("xls" "xlsx")) "excel" '(file))
         ))
  (openwith-mode 1))

Versions

Linux Mint 20

Emacs 26.3

What do I need to do, to see icons in Dired?

Answer 1

The issue is that openwith is set to open any .png file with the external program xnview.

Remove "png" from the fourth openwith-make-extension-regexp list and reload. Now emacs will handle the .pngfile natively if it can.