Customizing open and save as dialogs
Read this article on how to customize file open and save as dialogs -> http://msdn.microsoft.com/en-us/library/ms646960(VS.85).aspx
A keyword for search will be stc32. Well what is stc32? It’s a special static control’s id which acts as a placeholder for placing file open and save as dialog’s main pane. This allows us to position our own custom controls after or before main UI of open file dialog.
There is a sample in MSDN called OfnKing, which is quite good for starting off!