Hi Charly2008,
Thanks for posting this information as I'm trying to do exactly as you've shown i.e. open a SketchUp model using Inventor Fusion. I'm using the Mac version and my screens and menus are completely different as the file format options on the Open command. Did you have to add any plug-ins or other mods in order to get all of those file types to appears in your Open menu?
Thanks again for your post.
LLesniak