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Q: How to modify the default 'Open' dialog?

A:

• Delete or comment the following line added in message map of CWinApp-derived class by the AppWizard:
  
  ON_COMMAND(ID_FILE_OPEN, CWinApp::OnFileOpen)
• Using ClassWizard map yourself ID_FILE_OPEN command
  
  
• Write this code in ID_FILE_OPEN handler function:
• 
  
  void CMyApp::OnFileOpen()
  {
  LPCTSTR pszFilter =
  _T("Bitmap files (*.bmp;*.dib;*.rle)|*.bmp;*.dib;*.rle|")
  _T("JPEG files (*.jpg;*.jpeg;*.jpe;*.jfif)|*.jpg;*.jpeg;*.jpe;*.jfif||");
  CFileDialog dlgFile(TRUE, NULL, NULL,
  OFN_HIDEREADONLY,
  pszFilter,
  AfxGetMainWnd());
  if(IDOK == dlgFile.DoModal())
  {
  OpenDocumentFile(dlgFile.GetPathName());
  }
  }

Note: Most of the material in this article is taken from codeguru.com