diff --git a/src/lang/dutch.txt b/src/lang/dutch.txt
--- a/src/lang/dutch.txt
+++ b/src/lang/dutch.txt
@@ -1807,18 +1807,9 @@ STR_INTRO_TRANSLATION                   
 
 # Quit window
 STR_QUIT_CAPTION                                                :{WHITE}Afsluiten
-STR_QUIT_ARE_YOU_SURE_YOU_WANT_TO_EXIT_OPENTTD                  :{YELLOW}Weet je zeker dat je OpenTTD wilt verlaten en terug wilt keren naar {STRING}?
 STR_QUIT_YES                                                    :{BLACK}Ja
 STR_QUIT_NO                                                     :{BLACK}Nee
 
-# Supported OSes
-STR_OSNAME_WINDOWS                                              :Windows
-STR_OSNAME_UNIX                                                 :Unix
-STR_OSNAME_OSX                                                  :OS{NBSP}X
-STR_OSNAME_HAIKU                                                :Haiku
-STR_OSNAME_OS2                                                  :OS/2
-STR_OSNAME_SUNOS                                                :SunOS
-
 # Abandon game
 STR_ABANDON_GAME_CAPTION                                        :{WHITE}Spel sluiten
 STR_ABANDON_GAME_QUERY                                          :{YELLOW}Weet je zeker dat je dit spel wilt sluiten?