std::string filenameExt = filename.extension().string();
std::transform(filenameExt.begin(), filenameExt.end(), filenameExt.begin(), (int(*)(int))tolower);
std::string filenameExt = filename.extension().string();
std::transform(filenameExt.begin(), filenameExt.end(), filenameExt.begin(), (int(*)(int))tolower);
int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct) {if (CFrameWnd::On