有办法吗？

解决方法:

看看这个：Customize Your Open File Dialog

编辑：

07001

When coding against the Open File
common dialog in the Win32 API, you
can set a style to hide the places
bar. But like other features of the
Win32 common dialogs, this setting
seems to have gotten lost in the
migration to the .NET Framework.
Creating a common dialog has never
been easier than it is in the
Framework, but this simplicity comes
at the cost of some flexibility. In
addition, in managed code there is no
way to extend the layout of the dialog
with additional controls.