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Sure, here you go. Saved in LabVIEW 2012. OS Window and Native Window properties.vi

Referenced thread: http://lavag.org/topic/13803-getting-the-window-handle-for-a-fp-with-no-title-bar/

For what it's worth, there is a private VI property that returns the OS window handle so you don't need to use FindWindow. It's somewhere on lava but I can't link to it via the mobile site. I think it's called OSNativeWindow or something. The thread has a VI containing the property node which can be dropped in any other VI (it's a private property). That should fix any issue with window titles not matching. FindWindow has a lot of limitations, some of which include conflicts with other windows, or inability to find Windows without a title bar. I tend to use the property exclusively when I need an hWnd.