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.
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看看这个:自定义您的打开文件对话框
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Check this out : Customize Your Open File Dialog
EDIT:
.net 框架不支持对现有对话框进行实质性更改。
但是像这样这样的解决方案可以帮助您。
There is no support in the .net framework for substantial changes to the existing dialogs.
However solutions like this can help you.