Add open folder button to open currently selected tournament

osu.Game.Tournament/Screens/Setup/TournamentSwitcher.cs

@@ -11,6 +11,7 @@ namespace osu.Game.Tournament.Screens.Setup
     internal class TournamentSwitcher : ActionableInfo
     {
         private OsuDropdown<string> dropdown;
+        private OsuButton folderButton;
 
         [Resolved]
         private TournamentGameBase game { get; set; }
@@ -25,6 +26,7 @@ namespace osu.Game.Tournament.Screens.Setup
             dropdown.Current.BindValueChanged(v => Button.Enabled.Value = v.NewValue != startupTournament, true);
 
             Action = () => game.GracefullyExit();
+            folderButton.Action = storage.PresentExternally;
 
             ButtonText = "Close osu!";
         }
@@ -38,6 +40,12 @@ namespace osu.Game.Tournament.Screens.Setup
                 Width = 510
             });
 
+            FlowContainer.Insert(-2, folderButton = new TriangleButton
+            {
+                Text = "Open folder",
+                Width = 100
+            });
+
             return drawable;
         }
     }