How to re-use existing/already-opened Windows Explorer window to launch Explorer?

The IShellWindows COM interface will give you a list of open explorer windows, you can get and set the address of any explorer window, see this blog entry for a C++ sample. I doubt . NET has a native implementation of this, so you probably need to PInvoke.

Another option would be to (if you don't know the HWND of the explorer window you already opened/want to reuse) enumerate and find the window with a title that "looks like" what you want, then instruct that window to come to the foreground. It wouldn't reveal the exact file you want in it, but it might be simpler than other options :).

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