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diff --git a/meshmc/launcher/ui/InstanceWindow.h b/meshmc/launcher/ui/InstanceWindow.h
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+++ b/meshmc/launcher/ui/InstanceWindow.h
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+/* SPDX-FileCopyrightText: 2026 Project Tick
+ * SPDX-FileContributor: Project Tick
+ * SPDX-License-Identifier: GPL-3.0-or-later
+ *
+ *   MeshMC - A Custom Launcher for Minecraft
+ *   Copyright (C) 2026 Project Tick
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ *  This file incorporates work covered by the following copyright and
+ *  permission notice:
+ *
+ * Copyright 2013-2021 MultiMC Contributors
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <QMainWindow>
+#include <QSystemTrayIcon>
+
+#include "LaunchController.h"
+#include "launch/LaunchTask.h"
+
+#include "ui/pages/BasePageContainer.h"
+
+#include "QObjectPtr.h"
+
+class QPushButton;
+class PageContainer;
+class InstanceWindow : public QMainWindow, public BasePageContainer
+{
+	Q_OBJECT
+
+  public:
+	explicit InstanceWindow(InstancePtr proc, QWidget* parent = 0);
+	virtual ~InstanceWindow();
+
+	bool selectPage(QString pageId) override;
+	void refreshContainer() override;
+
+	QString instanceId();
+
+	// save all settings and changes (prepare for launch)
+	bool saveAll();
+
+	// request closing the window (from a page)
+	bool requestClose() override;
+
+  signals:
+	void isClosing();
+
+  private slots:
+	void on_closeButton_clicked();
+	void on_btnKillMinecraft_clicked();
+	void on_btnLaunchMinecraftOffline_clicked();
+
+	void on_InstanceLaunchTask_changed(shared_qobject_ptr<LaunchTask> proc);
+	void on_RunningState_changed(bool running);
+	void on_instanceStatusChanged(BaseInstance::Status,
+								  BaseInstance::Status newStatus);
+
+  protected:
+	void closeEvent(QCloseEvent*) override;
+
+  private:
+	void updateLaunchButtons();
+
+  private:
+	shared_qobject_ptr<LaunchTask> m_proc;
+	InstancePtr m_instance;
+	bool m_doNotSave = false;
+	PageContainer* m_container = nullptr;
+	QPushButton* m_closeButton = nullptr;
+	QPushButton* m_killButton = nullptr;
+	QPushButton* m_launchOfflineButton = nullptr;
+};