Open a file by using DialogBox

[gogogo]

When we push the button of "open file", it always show a window to let us select file. Now I want to open this window by pushing a button in DialogBox. How can I do it?
I know CWinApp::OnFileOpen() can open file, but I don't know how to do in detail. Please help me !!
Thanks a lot !!

programming environment: VC 6.0:

[eagle1]

Do you want any functionality or something?
What I usually do is create a button and:

	OPENFILENAME ofn = {0};
	char szName[MAX_PATH];
	*szName = 0;

	CString transfile1;

	ofn.lStructSize = sizeof(OPENFILENAME);
	ofn.hwndOwner = AfxGetApp()->m_pMainWnd->m_hWnd;
	ofn.lpstrFilter = NULL;
	ofn.lpstrFilter = "Exe files (*.exe)\0*.exe\0All files (*.*)\0*.*\0";
	ofn.lpstrCustomFilter = NULL;
	ofn.nFilterIndex = 1;
	ofn.lpstrFile = &szName[0];
	ofn.nMaxFile = MAX_PATH;
	ofn.lpstrInitialDir = NULL;
		//m_DefaultDir;
	ofn.lpstrTitle = "Open Executable File";
	ofn.lpstrFileTitle = NULL;
	ofn.lpstrDefExt = "TXT";
	ofn.Flags = OFN_FILEMUSTEXIST | OFN_HIDEREADONLY | OFN_PATHMUSTEXIST | OFN_EXPLORER;

	GetOpenFileName(&ofn);

and then I do whatever (be it execute the file, store the folder path, etc.).