Explorer.exe Command Line Switches

This is taken in part from MSDN in Q152457

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

/n
Always 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
Uses "Explorer" (instead of "Open") with the treeview.
/root,<object>
Sets the "object" (a path, CLSID, or IDLIST item) as the root (ie: you can't navigate above that)
/select,<object>
Starts with this "object" (generally, a folder or file) selected.
/IDLIST
lets explorer use folder's Unique ID's (these are temporary, and seem to have the main purpose of differentiating similar paths ??)

Note that if you use /n or /e you MUST use a comma between them and the <object> (regardless of whether you use /root or /select)

Examples:

Explorer /select,C:\test\application.exe

Opens a window view with application selected.

Example 2:

Explorer /e,/root,C:\test\application.exe

This opens Explorer with C: expanded and application selected.

Example 3:

Explorer /root,\\server\sharename

Opens a window view of the specified share.

Example 4:

Explorer /root,\\\server\sharename,/select,application.exe

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