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diff --git a/src/base/UPlatformWindows.pas b/src/base/UPlatformWindows.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 UPlatformWindows;
+
+interface
+
+{$IFDEF FPC}
+  {$MODE Delphi}
+{$ENDIF}
+
+{$I switches.inc}
+
+// turn off messages for platform specific symbols
+{$WARN SYMBOL_PLATFORM OFF}
+
+uses
+  Classes,
+  UPlatform,
+  UPath;
+
+type
+  TPlatformWindows = class(TPlatform)
+    private
+      UseLocalDirs: boolean;
+      
+      function GetSpecialPath(CSIDL: integer): IPath;
+      procedure DetectLocalExecution();
+    public
+      procedure Init; override;
+      function TerminateIfAlreadyRunning(var WndTitle: String): Boolean; override;
+
+      function GetLogPath: IPath; override;
+      function GetGameSharedPath: IPath; override;
+      function GetGameUserPath: IPath; override;
+  end;
+
+implementation
+
+uses
+  SysUtils,
+  ShlObj,
+  Windows,
+  UConfig;
+
+procedure TPlatformWindows.Init;
+begin
+  inherited Init();
+  DetectLocalExecution();
+end;
+
+//------------------------------
+//Start more than One Time Prevention
+//------------------------------
+function TPlatformWindows.TerminateIfAlreadyRunning(var WndTitle: String): Boolean;
+var
+  hWnd: THandle;
+  I: Integer;
+begin
+    Result := false;
+    hWnd:= FindWindow(nil, PChar(WndTitle));
+    //Programm already started
+    if (hWnd <> 0) then
+    begin
+      I := Messagebox(0, PChar('Another Instance of Ultrastar is already running. Continue ?'), PChar(WndTitle), MB_ICONWARNING or MB_YESNO);
+      if (I = IDYes) then
+      begin
+        I := 1;
+        repeat
+          Inc(I);
+          hWnd := FindWindow(nil, PChar(WndTitle + ' Instance ' + InttoStr(I)));
+        until (hWnd = 0);
+        WndTitle := WndTitle + ' Instance ' + InttoStr(I);
+      end
+      else
+        Result := true;
+    end;
+end;
+
+(**
+ * Returns the path of a special folder.
+ *
+ * Some Folder IDs:
+ * CSIDL_APPDATA       (e.g. C:\Documents and Settings\username\Application Data)
+ * CSIDL_LOCAL_APPDATA (e.g. C:\Documents and Settings\username\Local Settings\Application Data)
+ * CSIDL_PROFILE       (e.g. C:\Documents and Settings\username)
+ * CSIDL_PERSONAL      (e.g. C:\Documents and Settings\username\My Documents)
+ * CSIDL_MYMUSIC       (e.g. C:\Documents and Settings\username\My Documents\My Music)
+ *)
+function TPlatformWindows.GetSpecialPath(CSIDL: integer): IPath;
+var
+  Buffer: array [0..MAX_PATH-1] of WideChar;
+begin
+  if (SHGetSpecialFolderPathW(0, @Buffer, CSIDL, false)) then
+    Result := Path(Buffer)
+  else
+    Result := PATH_NONE;
+end;
+
+{**
+ * Detects whether the was executed locally or globally.
+ * - Local mode:
+ *   - Condition:
+ *     - config.ini is writable or creatable in the directory of the executable.
+ *   - Examples:
+ *     - The USDX zip-archive has been unpacked to a directory with write.
+ *       permissions
+ *     - XP: USDX was installed to %ProgramFiles% and the user is an admin.
+ *     - USDX is started from an external HD- or flash-drive
+ *   - Behavior:
+ *     Config files like config.ini or score db reside in the directory of the
+ *     executable. This is useful to enable windows users to have a portable
+ *     installation e.g. on an external hdd.
+ *     This is also the default behaviour of usdx prior to version 1.1
+ * - Global mode:
+ *   - Condition:
+ *     - config.ini is not writable.
+ *   - Examples:
+ *     - Vista/7: USDX was installed to %ProgramFiles%.
+ *     - XP: USDX was installed to %ProgramFiles% and the user is not an admin.
+ *     - USDX is started from CD
+ *   - Behavior:
+ *     - The config files are in a separate folder (e.g. %APPDATA%\ultrastardx)
+ *
+ * On windows, resources (themes, language-files)
+ * reside in the directory of the executable in any case
+ *
+ * Sets UseLocalDirs to true if the game is executed locally, false otherwise.
+ *}
+procedure TPlatformWindows.DetectLocalExecution();
+var
+  LocalDir, ConfigIni: IPath;
+  Handle: TFileHandle;
+begin
+  LocalDir := GetExecutionDir();
+  ConfigIni := LocalDir.Append('config.ini');
+
+  // check if config.ini is writable or creatable, if so use local dirs
+  UseLocalDirs := false;
+  if (ConfigIni.Exists()) then
+  begin
+    // do not use a read-only config file
+    if (not ConfigIni.IsReadOnly()) then
+    begin
+      // Just open the file in read-write mode to be sure that we have access
+      // rights for it.
+      // Note: Do not use IsReadOnly() as it does not check file privileges, so
+      // a non-read-only file might not be writable for us.
+      Handle := ConfigIni.Open(fmOpenReadWrite);
+      if (Handle <> -1) then
+      begin
+        FileClose(Handle);
+        UseLocalDirs := true;
+      end;
+    end;
+  end
+  else // config.ini does not exist
+  begin
+    // try to create config.ini
+    Handle := ConfigIni.CreateFile();
+    if (Handle <> -1) then
+    begin
+      FileClose(Handle);
+      UseLocalDirs := true;
+    end;
+  end;
+end;
+
+function TPlatformWindows.GetLogPath: IPath;
+begin
+  Result := GetGameUserPath;
+end;
+
+function TPlatformWindows.GetGameSharedPath: IPath;
+begin
+  Result := GetExecutionDir();
+end;
+
+function TPlatformWindows.GetGameUserPath: IPath;
+begin
+  if UseLocalDirs then
+    Result := GetExecutionDir()
+  else
+    Result := GetSpecialPath(CSIDL_APPDATA).Append('ultrastardx', pdAppend);
+end;
+
+end.