C / C++ / MFC

HICON hIcon = 0;

// Try to extract an icon from the file itself

SHFILEINFO shfi;
memset(&shfi, 0, sizeof(shfi));
if (SHGetFileInfo(pszPathname,
   FILE_ATTRIBUTE_NORMAL,
   &shfi,
   sizeof(shfi),
   SHGFI_ICON | SHGFI_SMALLICON))
{
   hIcon = shfi.hIcon;
}

// If no icon yet, get icon associated with the file type from the shell

if (hIcon == 0)
{
   LPTSTR pszExtension = PathFindExtension(pszPathname);
   CString DummyFileName;
   DummyFileName = _T("dummyfile");
   if (pszExtension[0] == _T('.'))
      DummyFileName += pszExtension;
   else
      DummyFileName += _T(".");

   SHFILEINFO shfi;
   memset(&shfi, 0, sizeof(shfi));
   if (SHGetFileInfo(DummyFileName,
      FILE_ATTRIBUTE_NORMAL,
      &shfi,
      sizeof(shfi),
      SHGFI_ICON | SHGFI_SMALLICON | SHGFI_USEFILEATTRIBUTES))
   {
      hIcon = shfi.hIcon;
   }
}

// Add the icon to the listview's image list

if (hIcon)
{
   rItem.iImage = m_imgList.Add(hIcon);
   rItem.mask = LVIF_IMAGE | LVIF_TEXT | LVIF_PARAM;
   m_lstSubmitFileList.InsertItem( &rItem );

   DestroyIcon(hIcon);
}

// header file your window definition 
class MyWindow : public CFrameWnd
{
   CWnd* m_pParent;

public:
   MyWindow( CWnd* pParent ) : m_pParent( pParent )
   {
      Create(  0, _T("Hello Window!!!") );
   }
};


// your dialog source file button click handler
void CPopupDlg::OnBnClickedButton1()
{
   if( m_pMyWindow == 0 ) {
      m_pMyWindow = new MyWindow( this );
   }

   if( m_pMyWindow->GetSafeHwnd() != 0 )
   {
      m_pMyWindow->ShowWindow( SW_SHOW );
      m_pMyWindow->UpdateWindow();
   }
}