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diff --git a/tools/pet/particlesystemdefinitionbrowser.h b/tools/pet/particlesystemdefinitionbrowser.h
new file mode 100644
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+++ b/tools/pet/particlesystemdefinitionbrowser.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+//===========================================================================//
+
+#ifndef PARTICLESYSTEMDEFINITIONBROWSER_H
+#define PARTICLESYSTEMDEFINITIONBROWSER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "vgui_controls/editablepanel.h"
+#include "tier1/utlstring.h"
+#include "particles/particles.h"
+
+
+//-----------------------------------------------------------------------------
+// Forward declarations
+//-----------------------------------------------------------------------------
+class CPetDoc;
+class CDmeParticleSystemDefinition;
+class CUndoScopeGuard;
+namespace vgui
+{
+	class ComboBox;
+	class Button;
+	class TextEntry;
+	class ListPanel;
+	class CheckButton;
+	class RadioButton;
+}
+
+
+//-----------------------------------------------------------------------------
+// Panel that shows all entities in the level
+//-----------------------------------------------------------------------------
+class CParticleSystemDefinitionBrowser : public vgui::EditablePanel
+{
+	DECLARE_CLASS_SIMPLE( CParticleSystemDefinitionBrowser, vgui::EditablePanel );
+
+public:
+	CParticleSystemDefinitionBrowser( CPetDoc *pDoc, vgui::Panel* pParent, const char *pName );   // standard constructor
+	virtual ~CParticleSystemDefinitionBrowser();
+
+	// Inherited from Panel
+	virtual void OnCommand( const char *pCommand );
+	virtual void OnKeyCodeTyped( vgui::KeyCode code );
+	MESSAGE_FUNC_CHARPTR( OnFileSelected, "FileSelected", fullpath );
+	// Methods related to updating the listpanel
+	void UpdateParticleSystemList();
+
+	// Select a particular node
+	void SelectParticleSystem( CDmeParticleSystemDefinition *pParticleSystem );
+
+	// Copy, paste.
+	void CopyToClipboard( );
+	void PasteFromClipboard( );
+
+private:
+	// Messages handled
+	MESSAGE_FUNC( OnItemDeselected, "ItemDeselected" );
+	MESSAGE_FUNC( OnItemSelected, "ItemSelected" );
+	MESSAGE_FUNC_PARAMS( OnInputCompleted, "InputCompleted", kv );
+
+	void ReplaceDef_r( CUndoScopeGuard& guard, CDmeParticleSystemDefinition *pDef );
+
+	// Gets the ith selected particle system
+	CDmeParticleSystemDefinition* GetSelectedParticleSystem( int i );
+
+	// Called when the selection changes
+	void UpdateParticleSystemSelection();
+
+	// Deletes selected particle systems
+	void DeleteParticleSystems();
+
+	// Create from KV
+	void LoadKVSection( CDmeParticleSystemDefinition *pNew, KeyValues *pOverridesKv, ParticleFunctionType_t eType );
+	CDmeParticleSystemDefinition* CreateParticleFromKV( KeyValues *pKeyValue );
+	void CreateParticleSystemsFromKV( const char *pFilepath );
+
+	// Shows the most recent selected object in properties window
+	void OnProperties();
+
+	CPetDoc *m_pDoc;
+	vgui::ListPanel		*m_pParticleSystemsDefinitions;
+};
+
+
+#endif // PARTICLESYSTEMDEFINITIONBROWSER_H