added file helper append extension to string.
added file helper append extension to string.
vuongminh/luya,nandes2062/luya,martinpetrasch/luya,vuongminh/luya,zephir/luya,vuongminh/luya,luyadev/luya,martinpetrasch/luya,nandes2062/luya,luyadev/luya,martinpetrasch/luya,nandes2062/luya,martinpetrasch/luya,luyadev/luya,zephir/luya,vuongminh/luya,zephir/luya,zephir/luya,nandes2062/luya,zephir/luya