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 System.Diagnostics.Process.Start("Explorer.exe", string.Format("/e, \"{0}\" ", TargetFileName));

Windows Explorer can be invoked (called, started) with parameters to get a specific view.

Syntax

explorer [/n] [/e,] [/root,object,][[/select],sub-object,]

Strangely enough a final comma is required (at least in some cases – not known in which ones)!

Parameters

/n	Opens a window in single-paned (My-computer) view for each selected item, even if the new window duplicated a window that is already open. This is the default view.
/e	Uses Windows Explorer view, which is most similar to File Manager view (Windows 3.x).
/root,object	Specifies the root level of the specified view. Default is to use the normal namespace root (desktop = my computer), whatever is specified for the root for the display.
/select	If /select is used, the parent folder is opened and the specified object is selected.

Examples

Display (explorer mode) drive D only	Explorer.exe /e, /root, d:\
Display (explorer mode) the start menu programs	Explorer.exe /e, /root, "f:\Win_95\Start Menu\Programs"
Diplay (single paned view) the c:windows folder and select calc.exe	Explorer.exe /select,c:\windows\calc.exe
Display single pane view with drive m selected	Explorer.exe /e, /select, "m:\"

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Explorer [/n] [/e] [(,)/root,<object>] [/select,<object>]

/n                Opens a new single-pane window for the default
                  selection. This is usually the root of the drive Windows
                   is installed on. If the window is already open, a
                  duplicate opens.

/e                Opens Windows Explorer in its default view.

/root,<object>    Opens a window view of the specified object.

/select,<object>  Opens a window view with the specified folder, file or
                  application selected.

Examples:

   Example 1:     Explorer /select,C:\TestDir\TestApp.exe

      Opens a window view with TestApp selected.

   Example 2:  Explorer /e,/root,C:\TestDir\TestApp.exe

      This opens Explorer with C: expanded and TestApp selected.

   Example 3:  Explorer /root,\\TestSvr\TestShare

      Opens a window view of the specified share.

   Example 4:  Explorer /root,\\TestSvr\TestShare,select,TestApp.exe

      Opens a window view of the specified share with TestApp selected.