diff --git a/contrib/translations/en/en_US.lng b/contrib/translations/en/en_US.lng
index 9c3f14c39..a3bd581ed 100644
--- a/contrib/translations/en/en_US.lng
+++ b/contrib/translations/en/en_US.lng
@@ -3114,6 +3114,9 @@ Mapper-defined
 :MENU:showdetails
 Show FPS and RT speed in title bar
 .
+:MENU:restartinst
+Re-run DOSBox-X instance
+.
 :MENU:restartconf
 Restart DOSBox-X with config file...
 .
diff --git a/contrib/translations/es/es_ES.lng b/contrib/translations/es/es_ES.lng
index 8e49d3ab9..926aaa55d 100644
--- a/contrib/translations/es/es_ES.lng
+++ b/contrib/translations/es/es_ES.lng
@@ -3095,6 +3095,9 @@ Definido por Mapeador: F11
 :MENU:showdetails
 Mostrar FPS y velocidad RT en barra de título
 .
+:MENU:restartinst
+Vuelva a ejecutar la instancia de DOSBox-X
+.
 :MENU:restartconf
 Reiniciar DOSBox-X con archivo config...
 .
diff --git a/contrib/translations/ja/ja_JP.lng b/contrib/translations/ja/ja_JP.lng
index 0f47d3a94..0a53045b2 100644
--- a/contrib/translations/ja/ja_JP.lng
+++ b/contrib/translations/ja/ja_JP.lng
@@ -3077,6 +3077,9 @@ Mapper-defined
 :MENU:showdetails
 FPS とRT スピードをタイトルバーに表示
 .
+:MENU:restartinst
+DOSBox-Xインスタンスを再実行します
+.
 :MENU:restartconf
 設定ファイルを用いてDOSBox-X を再起動 ...
 .
diff --git a/contrib/translations/zh/zh_CN.lng b/contrib/translations/zh/zh_CN.lng
index a2418bb5c..eebabc5af 100644
--- a/contrib/translations/zh/zh_CN.lng
+++ b/contrib/translations/zh/zh_CN.lng
@@ -3079,6 +3079,9 @@ DOS 命令
 :MENU:showdetails
 标题栏上显示速度
 .
+:MENU:restartinst
+重启 DOSBox-X 实例
+.
 :MENU:restartconf
 重启 DOSBox-X 并调用指定配置文件...
 .
diff --git a/contrib/translations/zh/zh_TW.lng b/contrib/translations/zh/zh_TW.lng
index 47d66ec56..a3d2bc968 100644
--- a/contrib/translations/zh/zh_TW.lng
+++ b/contrib/translations/zh/zh_TW.lng
@@ -3079,6 +3079,9 @@ DOS 命令
 :MENU:showdetails
 標題列上顯示速度
 .
+:MENU:restartinst
+重開 DOSBox-X 實例
+.
 :MENU:restartconf
 重開 DOSBox-X 並調用指定組態檔案...
 .
diff --git a/src/gui/menu.cpp b/src/gui/menu.cpp
index cf995e5be..44a79ec88 100644
--- a/src/gui/menu.cpp
+++ b/src/gui/menu.cpp
@@ -140,11 +140,7 @@ static const char *def_menu_main[] =
     "--",
     "mapper_reset",
     "mapper_reboot",
-#endif
-#if defined(MACOSX)
-    "mapper_newinst",
-#endif
-#if !defined(C_EMSCRIPTEN)//FIXME: Shutdown causes problems with Emscripten
+    "restartinst",
     "--",
     "restartconf",
     "restartlang",
diff --git a/src/gui/sdl_gui.cpp b/src/gui/sdl_gui.cpp
index 7d97c9cda..0f8390754 100644
--- a/src/gui/sdl_gui.cpp
+++ b/src/gui/sdl_gui.cpp
@@ -146,7 +146,7 @@ void RebootConfig(std::string filename, bool confirm=false) {
 }
 
 void RebootLanguage(std::string filename, bool confirm=false) {
-    std::string exepath=GetDOSBoxXPath(true), tmpconfig = "~dbxtemp.conf", para="-lang \""+filename+"\"";
+    std::string exepath=GetDOSBoxXPath(true), tmpconfig = "~dbxtemp.conf", para=filename.size()?"-lang \""+filename+"\"":"";
     struct stat st;
     if ((!confirm||CheckQuit())&&exepath.size()) {
         if (!stat(tmpconfig.c_str(), &st)) remove(tmpconfig.c_str());
@@ -1643,7 +1643,7 @@ public:
         ToplevelWindow(parent, x, y, 400, 150 + GUI::titlebar_y_stop, title) {
         new GUI::Label(this, 5, 10, MSG_Get("LANG_FILENAME"));
         name = new GUI::Input(this, 5, 30, width - 10 - border_left - border_right);
-        name->setText(control->opt_lang != "" ? control->opt_lang.c_str() : "messages.txt");
+        name->setText(control->opt_lang != "" ? control->opt_lang.c_str() : "messages.lng");
         new GUI::Label(this, 5, 60, MSG_Get("LANG_LANGNAME"));
         lang = new GUI::Input(this, 5, 80, width - 10 - border_left - border_right);
         lang->setText(langname.c_str());
diff --git a/src/gui/sdlmain.cpp b/src/gui/sdlmain.cpp
index 2cef4a6b8..54d44a000 100644
--- a/src/gui/sdlmain.cpp
+++ b/src/gui/sdlmain.cpp
@@ -303,6 +303,7 @@ unsigned int sendkeymap=0;
 std::string configfile = "";
 std::string strPasteBuffer = "";
 ScreenSizeInfo screen_size_info;
+void RebootLanguage(std::string filename, bool confirm=false);
 bool CodePageHostToGuestUTF16(char *d/*CROSS_LEN*/,const uint16_t *s/*CROSS_LEN*/);
 bool CodePageGuestToHostUTF16(uint16_t *d/*CROSS_LEN*/,const char *s/*CROSS_LEN*/);
 
@@ -5663,7 +5664,7 @@ static void GUI_StartUp() {
     item->set_text("Quick launch program...");
 #endif
 
-#if defined(MACOSX)
+#if defined(MACOSX) && 0
     MAPPER_AddHandler(NewInstanceEvent, MK_nothing, 0, "newinst", "Start new instance", &item);
     item->set_text("Start new instance");
     {
@@ -10939,10 +10940,7 @@ void Restart_language_file() {
             while (*name == CROSS_FILESPLIT) name++;
         }
 
-        if (*name) {
-            void RebootLanguage(std::string filename, bool confirm=false);
-            RebootLanguage(name, true);
-        }
+        if (*name) RebootLanguage(name, true);
     }
     if(chdir(Temp_CurrentDir) == -1) {
         LOG(LOG_GUI, LOG_ERROR)("Restart_language_file failed to change directories.");
@@ -12129,6 +12127,13 @@ bool showdetails_menu_callback(DOSBoxMenu * const xmenu, DOSBoxMenu::item * cons
     return true;
 }
 
+bool restartinst_menu_callback(DOSBoxMenu * const xmenu, DOSBoxMenu::item * const menuitem) {
+    (void)xmenu;//UNUSED
+    (void)menuitem;//UNUSED
+    RebootLanguage("", true);
+    return true;
+}
+
 bool restartconf_menu_callback(DOSBoxMenu * const xmenu, DOSBoxMenu::item * const menuitem) {
     (void)xmenu;//UNUSED
     (void)menuitem;//UNUSED
@@ -14434,6 +14439,7 @@ int main(int argc, char* argv[]) SDL_MAIN_NOEXCEPT {
         /* more */
         std::string doubleBufString = std::string("desktop.doublebuf");
         mainMenu.alloc_item(DOSBoxMenu::item_type_id,"showdetails").set_text("Show FPS and RT speed in title bar").set_callback_function(showdetails_menu_callback).check(!menu.hidecycles && menu.showrt);
+        mainMenu.alloc_item(DOSBoxMenu::item_type_id,"restartinst").set_text("Re-run DOSBox-X instance").set_callback_function(restartinst_menu_callback);
         mainMenu.alloc_item(DOSBoxMenu::item_type_id,"restartconf").set_text("Restart DOSBox-X with config file...").set_callback_function(restartconf_menu_callback);
         mainMenu.alloc_item(DOSBoxMenu::item_type_id,"restartlang").set_text("Restart DOSBox-X with language file...").set_callback_function(restartlang_menu_callback);
         mainMenu.alloc_item(DOSBoxMenu::item_type_id,"auto_lock_mouse").set_text("Autolock mouse").set_callback_function(autolock_mouse_menu_callback).check(sdl.mouse.autoenable);
diff --git a/src/misc/messages.cpp b/src/misc/messages.cpp
index 1d512d414..97f7399ae 100644
--- a/src/misc/messages.cpp
+++ b/src/misc/messages.cpp
@@ -281,6 +281,7 @@ void MSG_Init() {
 
 	if (control->opt_lang != "") {
 		LoadMessageFile(control->opt_lang.c_str());
+		SetVal("dosbox", "language", control->opt_lang.c_str());
 	}
 	else {
 		Prop_path* pathprop = section->Get_path("language");