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diff --git a/src/base/UPlatform.pas b/src/base/UPlatform.pas
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+{* UltraStar Deluxe - Karaoke Game
+ *
+ * UltraStar Deluxe is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 2
+ * 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; see the file COPYING. If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *}
+
+unit UPlatform;
+
+// Comment by Eddie:
+// This unit defines an interface for platform specific utility functions.
+// The Interface is implemented in separate files for each platform:
+// UPlatformWindows, UPlatformLinux and UPlatformMacOSX.
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+uses
+  Classes,
+  UPath;
+
+type
+  TPlatform = class
+    function GetExecutionDir(): IPath;
+    procedure Init; virtual;
+
+    function TerminateIfAlreadyRunning(var WndTitle: string): boolean; virtual;
+    procedure Halt; virtual;
+
+    function GetLogPath:        IPath; virtual; abstract;
+    function GetMusicPath:      IPath; virtual; abstract;
+    function GetGameSharedPath: IPath; virtual; abstract;
+    function GetGameUserPath:   IPath; virtual; abstract;
+  end;
+
+  function Platform(): TPlatform;
+
+implementation
+
+uses
+  SysUtils,
+  {$IF Defined(MSWINDOWS)}
+  UPlatformWindows,
+  {$ELSEIF Defined(DARWIN)}
+  UPlatformMacOSX,
+  {$ELSEIF Defined(UNIX)}
+  UPlatformLinux,
+  {$IFEND}
+  ULog,
+  UUnicodeUtils,
+  UFilesystem;
+
+
+// I modified it to use the Platform_singleton in this location (in the implementation)
+// so that this variable can NOT be overwritten from anywhere else in the application.
+// the accessor function platform, emulates all previous calls to work the same way.  
+var
+  Platform_singleton: TPlatform;
+
+function Platform: TPlatform;
+begin
+  Result := Platform_singleton;
+end;
+
+(**
+ * Default Init() implementation
+ *)
+procedure TPlatform.Init;
+begin
+end;
+
+(**
+ * Default Halt() implementation
+ *)
+procedure TPlatform.Halt;
+begin
+  // Note: Application.terminate is NOT the same
+  System.Halt;
+end;
+
+{**
+ * Returns the directory of the executable
+ *}
+function TPlatform.GetExecutionDir(): IPath;
+var
+  ExecName, ExecDir: IPath;
+begin
+  ExecName := Path(ParamStr(0));
+  ExecDir := ExecName.GetPath;
+  Result := ExecDir.GetAbsolutePath();
+end;
+
+(**
+ * Default TerminateIfAlreadyRunning() implementation
+ *)
+function TPlatform.TerminateIfAlreadyRunning(var WndTitle: string): boolean;
+begin
+  Result := false;
+end;
+
+initialization
+{$IF Defined(MSWINDOWS)}
+  Platform_singleton := TPlatformWindows.Create;
+{$ELSEIF Defined(DARWIN)}
+  Platform_singleton := TPlatformMacOSX.Create;
+{$ELSEIF Defined(UNIX)}
+  Platform_singleton := TPlatformLinux.Create;
+{$IFEND}
+
+finalization
+  Platform_singleton.Free;
+
+end.