diff --git a/data/en.mse-locale/locale b/data/en.mse-locale/locale
index 4055bc5f..2c1afdeb 100644
--- a/data/en.mse-locale/locale
+++ b/data/en.mse-locale/locale
@@ -444,6 +444,7 @@ label:
 	
 	# Preferences
 	language:			Language
+	windows:			Open sets
 	app language:		Language of the user interface:
 	card display:		Card Display
 	zoom:				&Zoom:
@@ -548,6 +549,7 @@ button:
 	last opened set:	Last opened set
 	
 	# Preferences
+	open sets in new window:	Open all sets in a new &window
 	select:				&Select...
 	browse:				&Browse...
 	high quality:		&High quality rendering
diff --git a/src/gui/preferences_window.cpp b/src/gui/preferences_window.cpp
index 151310bd..766d88d5 100644
--- a/src/gui/preferences_window.cpp
+++ b/src/gui/preferences_window.cpp
@@ -39,6 +39,7 @@ class GlobalPreferencesPage : public PreferencesPage {
 	
   private:
 	wxComboBox* language;
+	wxCheckBox* open_sets_in_new_window;
 };
 
 // Preferences page for card viewing related settings
@@ -137,6 +138,7 @@ GlobalPreferencesPage::GlobalPreferencesPage(Window* parent)
 {
 	// init controls
 	language = new wxComboBox(this, wxID_ANY, _(""), wxDefaultPosition, wxDefaultSize, 0, nullptr, wxCB_READONLY);
+	open_sets_in_new_window = new wxCheckBox(this, wxID_ANY, _BUTTON_("open sets in new window"));
 	// set values
 	vector<PackagedP> locales;
 	package_manager.findMatching(_("*.mse-locale"), locales);
@@ -149,23 +151,30 @@ GlobalPreferencesPage::GlobalPreferencesPage(Window* parent)
 		}
 		n++;
 	}
+	open_sets_in_new_window->SetValue(settings.open_sets_in_new_window);
 	// init sizer
 	wxSizer* s = new wxBoxSizer(wxVERTICAL);
 	s->SetSizeHints(this);
 		wxSizer* s2 = new wxStaticBoxSizer(wxVERTICAL, this, _LABEL_("language"));
 			s2->Add(new wxStaticText(this, wxID_ANY, _LABEL_("app language")), 0,            wxALL,          4);
 			s2->Add(language,                                                  0, wxEXPAND | wxALL & ~wxTOP, 4);
-			s2->Add(new wxStaticText(this, wxID_ANY, _HELP_( "app language")), 0,            wxALL & ~wxTOP, 4);
+			s2->Add(new wxStaticText(this, wxID_ANY, _HELP_( "app language")), 0,            wxALL,          4);
 		s->Add(s2, 0, wxALL | wxEXPAND, 8);
+		wxSizer* s3 = new wxStaticBoxSizer(wxVERTICAL, this, _LABEL_("windows"));
+			s3->Add(open_sets_in_new_window, 0, wxALL, 4);
+		s->Add(s3, 0, wxALL & ~wxTOP | wxEXPAND, 8);
 	SetSizer(s);
 }
 
 void GlobalPreferencesPage::store() {
+	// locale
 	int n = language->GetSelection();
 	if (n == wxNOT_FOUND) return;
 	Packaged* p = (Packaged*)language->GetClientData(n);
 	settings.locale = p->name();
 	// set the_locale?
+	// open_sets_in_new_window
+	settings.open_sets_in_new_window = open_sets_in_new_window->GetValue();
 }
 
 // ----------------------------------------------------------------------------- : Preferences page : display
diff --git a/src/resource/common/expected_locale_keys b/src/resource/common/expected_locale_keys
index 993e699c..57f2f04b 100644
--- a/src/resource/common/expected_locale_keys
+++ b/src/resource/common/expected_locale_keys
@@ -1,6 +1,6 @@
 # This file contains the keys expected to be in MSE locales
 # It was automatically generated by tools/locale/locale.pl
-# Generated on Sat Aug  9 19:00:54 2008
+# Generated on Wed Aug 27 13:54:25 2008
 
 action:
 	add control point:	0
@@ -70,6 +70,7 @@ button:
 	number:	0
 	number overwrite:	0
 	open set:	0
+	open sets in new window:	0
 	overwrite:	0
 	random seed:	0
 	refer parameter:	0
@@ -334,6 +335,7 @@ label:
 	total cards:	0
 	upgrade package:	0
 	uses:	0
+	windows:	0
 	zoom:	0
 	zoom %:	0
 	zoom amount:	0