Trouble with Opening new Browser window

What's the recommended method for adding a button action that opens an internal html page in a new browser window? By internal page I mean an html page that I've created that's not a web address that I can link to. I've tried the following:Adding a button action to Launch a program/document, and attached the html file. But it displays in the same browser window.Modifying the javascript function to include window.open, which works to display it in a new window, but I lose display of the original html window.

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