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/DefaultResourceLocator.java
try
		{
			URL objURI = new URL( fileName );
			if ( isGlobalResource( objURI ) )
				return objURI;
			return tryLocalResourceSearch( objURI );
		}
		catch ( MalformedURLException e )
		{
			
		}
		
		if ( moduleHandle == null )
			return tryFragmentSearch( fileName );
		
		
		String resourcePath = moduleHandle.getModule( ).getSession( )
				.getResourceFolder( );
		if ( resourcePath == null )
			resourcePath = moduleHandle.getResourceFolder( );
		if ( resourcePath != null )
		{
			File f = new File( resourcePath, fileName );
			try
			{
				if ( f.exists( ) && f.isFile( ) )
					return f.getCanonicalFile( ).toURL( );
			}
			catch ( IOException e )