Yea, to my understanding, Windows sees that it’s javascript (a .js file) and defaults to trying to run it (as opposed to editing it with notepad) like it’s a full jscript program in and of itself. It’s not though. It’s just an extension for the html file (index.html), so when when Windows tells Java to try and run it, Java takes one look at it, doesn’t have all the info it needs and basically throws its hands and up and say ‘I don’t even know what this shit is supposed to mean.’ (hence ‘SceneNavigator’ is undefined). Therefore, a pretty much useless error if you don’t already know what you’re doing.