Running RC3 on Windows 7 Ultimate 64 but and when I double click on any drawing file, all of the draw tools and almost all of the menus/options are grayed out. If I open RC3 and use the open dialog to open a drawing, it works fine.
I also noticed that when I double click on the drawing, it does not show the drawing at the same zoom level I saved it at. So, if I save the drawing taking up the entire screen, it is very small in the bottom left corner when double clicking on it. It does not do this when opening using the Open dialog.
Not a big deal to me since I rarely double click on a file to open it.