fail to delete project directory when in windows

fail to delete project directory when deleting project in windows xp,because following code should include File.separator but includes '/':
...

if (deleteProjectFiles) {
try

{ resourceSet.getResources().remove(resource); resource.unload(); int lastIndexOf = path.lastIndexOf('/'); if (lastIndexOf == -1) lastIndexOf = path.length(); path = path.substring(0, lastIndexOf); final File file = new File(path); deleteFile(file); }

catch (Exception e)

{ ProjectUIPlugin.log("Error deleting project file", e); //$NON-NLS-1$ }

}
...