Hi Brian, from your link it looks like the blue flask button has this on it:

onbuttonclick="moi.filesystem.shellExecute( moi.filesystem.getAppDataDir() + 'moi_ref\\index.htm' );"

So when you click it, it should be looking for a file index.htm inside appdata\moi_ref .

You should probably double check if that is still what your button has on it and also double check if you've got your new file inside the moi_ref subfolder and that it is named index.htm and not index.html (no "L" at the end).

- Michael