http://bugs.winehq.org/show_bug.cgi?id=24285
--- Comment #10 from aerilius@googlemail.com 2013-06-15 12:00:29 CDT --- The issue is not yet solved. I tried it with plain Wine 1.5.31 (in a clean prefix but the missing mfc80u.dll added into the SketchUp program directory) and all SketchUp versions fro 7 to 2013.
The "File → 3D Warehouse → Share Model" feature still opens an empty white dialog and the webpage that is supposed to be displayed inside opens in Linux native Firefox.