(require 'dired-open)
(setq dired-open-extensions
      '(("exe" . "wine") ("docx" . "libreoffice")
        ("doc" . "libreoffice") ("xlsx" . "libreoffice")
        ("xls" . "libreoffice")
        ("mp3" . "mpv")
        ("mp4" . "mpv")
        ("flv" . "mpv")
        ))