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/core/Module.java
* Return the folder in which the design file is located. The search depend
	 * on the {@link #getFileName()}.
	 * 
	 * @return the folder in which the design file is located. Return
	 *         <code>null</code> if the folder can not be found.
	 * @deprecated since BIRT 2.1. find the message in resource path.
	 */
	private File getModuleFolder( )
	{
		if ( systemId == null )
			return null;
		return new File( systemId.getFile( ) );
	}
	/**
	 * Finds a custom color by name.
	 * 
	 * @param colorName
	 *            the custom color name
	 * @return the custom defined color that matches, or <code>null</code> if
	 *         the color name was not found in the custom color palette.
	 */
	public CustomColor findColor( String colorName )
	{
		StructureDefn defn = (StructureDefn) MetaDataDictionary.getInstance( )
				.getStructure( CustomColor.CUSTOM_COLOR_STRUCT );
		return (CustomColor) StructureRefUtil.findStructure( this, defn,
				colorName );
	}
	/**
	 * Finds a config variable by name