My system is Windows 7 zh_CN.
System default code is GBK.
In HTML.tgz\HTML.docset\Contents\Resources\Documents\mdn.mozillademos.org\zh-CN\docs\Web\HTML\Element\datalist$samples\ have a file is 示例426e.html.But file name is ê?ày426e.html in system.

Then std::ifstream can't find file and QIODevice::read: device not open.