(startapp "explorer /e, c:\\temp\\")

Explorer 실행 옵션

https://superuser.com/questions/21394/explorer-command-line-switches

• /separate - Launches this explorer instance as a separate process.
• /select [object] - selects the file or folder in the new explorer window
• Opens a new single-pane Window for the default selection. This is usually the root of the drive on which Windows is installed.
• /e Starts - Windows Explorer using its default view.
• /root - Opens a window view of the specified object.