MFC 操作注册表 Open QueryValue等

    // 获取IEXPLORE所在路径
   CRegKey reg; 
    LPCTSTR lpszKey = _T("Software\\Microsoft\\Windows\\CurrentVersion\\App Paths\\IEXPLORE.exe");
    CString strValue = _T("");
    DWORD size = 1000;

    if(ERROR_SUCCESS == reg.Open(HKEY_LOCAL_MACHINE, lpszKey)) 
    {         
        reg.QueryValue(strValue.GetBuffer(MAX_PATH),_T("Path"),&size); 
        strValue.ReleaseBuffer();
        reg.Close();     
    } 

参考：http://www.cnblogs.com/guanjinke/archive/2005/10/31/265835.html