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diff --git a/logic/LegacyInstance.h b/logic/LegacyInstance.h
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+/* Copyright 2013 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 "BaseInstance.h"
+
+class ModList;
+class Task;
+
+class LegacyInstance : public BaseInstance
+{
+	Q_OBJECT
+public:
+
+	explicit LegacyInstance(const QString &rootDir, SettingsObject *settings,
+							QObject *parent = 0);
+
+	/// Path to the instance's minecraft.jar
+	QString runnableJar() const;
+
+	//! Path to the instance's modlist file.
+	QString modListFile() const;
+
+	//////  Mod Lists  //////
+	std::shared_ptr<ModList> jarModList();
+	std::shared_ptr<ModList> coreModList();
+	std::shared_ptr<ModList> loaderModList();
+	std::shared_ptr<ModList> texturePackList();
+
+	////// Directories //////
+	QString savesDir() const;
+	QString texturePacksDir() const;
+	QString jarModsDir() const;
+	QString binDir() const;
+	QString loaderModsDir() const;
+	QString coreModsDir() const;
+	QString resourceDir() const;
+	virtual QString instanceConfigFolder() const override;
+
+	/*!
+	 * Whether or not the instance's minecraft.jar needs to be rebuilt.
+	 * If this is true, when the instance launches, its jar mods will be
+	 * re-added to a fresh minecraft.jar file.
+	 */
+	bool shouldRebuild() const;
+	void setShouldRebuild(bool val);
+
+	virtual QString currentVersionId() const override;
+
+	//! The version of LWJGL that this instance uses.
+	QString lwjglVersion() const;
+	/// st the version of LWJGL libs this instance will use
+	void setLWJGLVersion(QString val);
+
+	virtual QString intendedVersionId() const override;
+	virtual bool setIntendedVersionId(QString version) override;
+	// the `version' of Legacy instances is defined by the launcher code.
+	// in contrast with OneSix, where `version' is described in a json file
+	virtual bool versionIsCustom() override
+	{
+		return false;
+	}
+
+	virtual bool shouldUpdate() const override;
+	virtual void setShouldUpdate(bool val) override;
+	virtual std::shared_ptr<Task> doUpdate() override;
+
+	virtual MinecraftProcess *prepareForLaunch(AuthSessionPtr account) override;
+	virtual void cleanupAfterRun() override;
+	virtual QDialog *createModEditDialog(QWidget *parent) override;
+
+	virtual QString defaultBaseJar() const override;
+	virtual QString defaultCustomBaseJar() const override;
+
+	bool menuActionEnabled(QString action_name) const;
+	virtual QString getStatusbarDescription() override;
+
+protected
+slots:
+	virtual void jarModsChanged();
+};