C / C++ / MFC

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class COpenFileDialog : public CFileDialog
{
    DECLARE_DYNAMIC(COpenFileDialog)

public:
    COpenFileDialog(BOOL bOpenFileDialog,
        LPCTSTR lpszDefExt = NULL,
        LPCTSTR lpszFileName = NULL,
        DWORD dwFlags = OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT,
        LPCTSTR lpszFilter = NULL,
        CWnd* pParentWnd = NULL);

    virtual ~COpenFileDialog();

    virtual BOOL OnInitDialog();

protected:
    DECLARE_MESSAGE_MAP()
};

// OpenFileDialog.cpp : implementation file
//

#include "stdafx.h"
#include "OpenFileDialog.h"

IMPLEMENT_DYNAMIC(COpenFileDialog, CFileDialog)

COpenFileDialog::COpenFileDialog(BOOL bOpenFileDialog, LPCTSTR lpszDefExt, LPCTSTR lpszFileName, DWORD dwFlags, LPCTSTR lpszFilter, CWnd* pParentWnd) :
        CFileDialog(bOpenFileDialog, lpszDefExt, lpszFileName, dwFlags, lpszFilter, pParentWnd)
{
}

COpenFileDialog::~COpenFileDialog()
{
}

BEGIN_MESSAGE_MAP(COpenFileDialog, CFileDialog)
END_MESSAGE_MAP()

// COpenFileDialog message handlers

BOOL COpenFileDialog::OnInitDialog()
{
    BOOL b = CFileDialog::OnInitDialog();

    DWORD dwStyle = ::GetWindowLong(m_hWnd,GWL_STYLE);
    if ( dwStyle&WS_CHILD )
    {
        // get the toolbar based on its ID.
        const DWORD NEW_FOLDER_ID = 0xA002;
        HWND hwndtb = ::FindWindowEx(GetParent()->m_hWnd,NULL,TOOLBARCLASSNAME,NULL);

        // hide the "New Folder" button.
        if ( hwndtb ) 
::SendMessage( hwndtb, TB_HIDEBUTTON, NEW_FOLDER_ID, MAKELONG(TRUE,0) );
    }

    return b;
}