Bug 155509 ModuleHandle findResource method does not support .properties files
There is no fileType for .properties files in IResourceLocator
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/IResourceLocator.java
/**
	 * The type for the jar file. Includes .jar type.
	 */
	public final static int JAR_FILE = 4;
	/**
	 * Searches the file by the given file name. The actual search algorithm
	 * will be different in different environment. The file type is just helpful
	 * when different file searching steps for different files are required.
	 * Because new file type will be added if design file includes new file, the
	 * default searching steps are encouraged for unknown file type to improve
	 * robustness.
	 * 
	 * @param moduleHandle
	 *            The module to tell the search context. This could be null if
	 *            the search algorithm does not need the design. It can be the
	 *            instance of one of <code>ReportDesignHandle</code> and
	 *            <code>LibraryHandle</code>.
	 * @param filename
	 *            The file name to be searched. This could be an absolute path
	 *            or a relative path.
	 * @param type
	 *            The type of the file to search. The value must be one of
	 *            <code>IMAGE</code>,<code>LIBRARY</code> and
	 *            <code>CASCADING_STYLE_SHEET</code>.
	 * @return The <code>URL</code> object. <code>null</code> if the file
	 *         can not be found.
	 */
	public URL findResource( ModuleHandle moduleHandle, String filename,
			int type );
}